Operating regulations to govern coal-mining methods and the safety and welfare of miners on leased lands on the public domain under the Act of February 25, 1920 (Public no. 146) [microform]

United States. Bureau of Mines · 1921 · Historical

Mining supervisor. — The agent appointed by and acting for the Secretar} of the Interior to supervise ail the coal-mining operations under these regulations.

This 1921 document, Operating regulations to govern coal-mining methods and the safety and welfare of miners on leased lands on the public domain under the Act of February 25, 1920 (Public no. 146) [microform], is preserved in the Mountain Man Mining Library for research and reference. Original source: archive.org.

U.S. Bureau of Mines

Operating regulations to govern coal-nriining...

Washington

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Operating regulations to govern coal-minjng methand the safety and welfare of miners on leased lands on the t)ublic domain under the Act of February 25, 1920 (Publib no. 146). .Washington, Govt print, off., 192L

At head of title: Department of the interior* Albert B. Pall, teereCary.

Bureau of mines. H. Foster Bain, director.

Running title : Operating regulations for coal mines.

D62233 Oopy in Iglasion Library* 1921* Un34 1. mbes and iniiiiiiK— U S. i. Title.

Tn805.A38 1920

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Department Of The Interior -7

Operating Regulations

GOVERN COAL-MINING METHODS AND THE SAFETY AND WELFARE OF MINERS LEASED LANDS ON THE PUBLIC DOMAIN

UNDER THE ACT OF FEBRUARY 25. 1920 (PUUiC 146)

AI3BST B. PALL, SWUtabt

Bureau Of Mines

H. FOSTER BAIN, DirBCTOR

WA8HIKGTOK GOVBRNHBNT miNTINO OPFICB

urn

Contents.

Page.

Definitions

Powers and duties of mining suimvisor, dislriet miniag si4)erv3B(r and deputy

mining supervisor

Duties of lessee i ? - -

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a

OPERATING REGULATIONS TO GOVERN COAL-MINING METHODS AND THE SAFETY AND WELFARE OF MINERS UN LEASED LANDS ON THE PUBLIC DOMAIN.

Under the act of Congress approved February 25, 1920. (Public No. 146— 6th

Definitions.

The following expressions wherever used in these regulations shall have the moaning now designated, viz:

Mining supervisor. — The agent appointed by and acting for the Secretar} of the Interior to supervise ail the coal-mining operations under these regulations.

District mining supervisor. — An agent appointed by the Secretary of the Interior to supervise coal-mining operations in one or more of the coal fields of the United States, acting under the diiection of the mining supervisor.

Deputy mining supervisor. — An agent appointed by the Socretarv of the Interior to supervise specific coal-mining operations, acting under the direction of the mining supervisor or district mining supervisor.

Lessee. — Any person or persons, partnership, association, firm, corporation, municipality, or wState to whom a coal-mining lease, permit, or license is issued under the act of February 25, 1920.

Leased land. — The term '*coal land/ coal deposit,'' or ''leased tract'' shall mean any land or deposit owned by the United States, outside of Alaska, under lease, permit, or license in acconhmce with the act of February 25, 1920, for the purpose of mining coal therefrom.

Coal. — The term ''coal" shall include lignite, subbituniinous, cannel, bituminous, semibituminous, semianthracite, and anthracite.

Face. — The term " face " shall mean the advancing breast of a working place, of an entry, room, or slope.

Mine.— The term "mine" shall mean an underground excavation and development with shafts, slopes, drifts, or tunnels for the extraction of coal with hoisting or haulage equipment and appliances for the extraction of coal, and shall embrace any and all parts of the leased land or property and mining plant, on the surface and underground, that contribute directly or intUroctly to the mining or handhng of coal. Said excavation may be in one or several beds of coal, provided tlie hoisting or haulage is through an opening or openings to tle surface used in common.

Stripping operation.— The term "stripping" or "stripping operation" shall mean a mining excavation or development by means of a siu'face pit or quarry, in which the surface or cover over the coal bed is first removed and the coal itself is excavated by scrapers, shovels, or other mechanical appliances, or by hand tools with or without preliminary blasting.

Slope. — The term "slope'' shall mean an inchned entry in a dipping coal bed or an. inclined tunnel to a coal bed, the average incliuatiou of which is less than 45° from the horizontal.

Shaft. — The term "shaft," when unmodified, shall mean an opening, the axis of which is approximately vertical, extending from the surface to a coal deposit ; also an undergrovmd shaft between two or more levels.

Inclined shaft. — The term "inclined shaft" shall mean a shaft which is inclined from the horizontal more than 45°.

Drift. — The term "drift" shall mean a horizontal passageway, level, or gangway, driven from the surface Qutcrop in the coal bed.

OPERATING REGUIATIONS TOfi COAL MINES

Tuiiael.— The term "tunnel" shall mean a level or inclined passageway that is mainly in barren strata and which may or may not

extend to the surface. , . j

Boom.— The term "room" shall mean a wide working place turned

off an entry, slope, ot level. „ , „

Workiiig place.— The term "working place" shall mean a room breast, entry, pillar, or place where coal is being mined or extracted and where one or more miners per working shift of thymine are reguladly employed until the place is finished or stopped.

Panel. The term "panel" shall mean a unit area in a system of

mining by which the mine is divided into laie rectangles or panels isolated or surrounded by soUd pillars of coal into which pairs of entries are driven for the developiaent of rowm and the extraction

of pillars. , „ . , ,

Entry.— The term "entry" shall mean a passageway m a coal bed that is approximately level and is used for haulage, traveling way, or ventilation. In a dipping bed, entries on the strike are known as "levels" or "gangways," and to the dip are known as "slopes."

Crosscnt.- The term "crosscut" shall mean a passage dnven to connect adjacent parallel entries or rooms. The term is synonjanous with "cut-through"; and between rooms, where driven wide, is synwiymous with "break-through." „ , j . „

Bock dusting.— The term "rock dustmg," "shale dusting, or "stone dusting" shall mean to distribute or apply within passageways fine rock or shale dust in such a manner as to prevent, dbeck, control, or extinguish coal-dust explosions as described in the pubhcations of the United States Bureau of Mines on coal-dust explosions.

Bock-dnst barriers.— The term "rock-dust barrier" shall mean a hiTe quantity of dry rock dust placed on such mechanically operated ahSves or containers of dean tested and approved by the Bureau of Mines and so located in a mine passageway that the pioneering wave of an explosion will automatically cause the dust to be thrown into suspension and extinguish the flame, thus limiting the explosion.

Gas.— The term "gas'in these regulations is used in the sense employed by coal mmers to mean "&e damp," or an inflammable or explosive gas, chiefly

natural gas, accompamed by ethane. When mixed in certain proportions with air the mixture is explosive. (See Metha-ne.) ,

Fire damp.— The term "fire damp" in these regulations is used m the sense employed by miners as synonymous with " gas, and may or may not be in such proportions with air as to be explosive when ignited.

Methane.— "Methane" is a hydrocarbon gas (CH) frequently encountered in coal mines; it is mflammable and when it is diffused through air in proportions of 5.5 to 14.5 per cent, the mixture in the presence of a flame or hot spark will explode.

Ethane.— Ethane is a hydrocarbon gas (C,H,) found with other lighter hydrocarbon gases in natural gas in conjunction with methane.

Permissible.— The term "permissible" as apphed in these regular tions in connection with explosives, safety lamps, electric machmery, rescue apparatus, and other devices shall mean materials, apparatus, and devices officially Usted by the Bureau of Mmes under a schedule of tests and approved as having met its requironents for the respeve

SDGClTlGCl IISGS

Potential and voltage.— These shall be taken as synonymous terms to mean electrical pressure as determined by a voltmeter.

POWERS AND DUTIES OF MINING SUPERVISOR, DIS- TRICT MINING SUPERVISOR. AND DEPUTY MIN- ING SUPERVISOR.

It shall be the duty of flie mining supervisor, district mining supervisor, and deputy mining supervisor:

Sec. 1. To visit from tmie to time leased lands coal-mining operations are being conducted, and to in-by saparfim spect and supervise such operations and plants connected therewith in order to prevent injury to life, wastage of coal, damage to or from oil and gas wells passing through the coal beds, and damage to olher property and to equipment, and in order to supervise matters pertainii] to the welfare of the miners m accordance with the provisions of these regulations.

rior as to the condition of the leased property and leSnioi&i- manner in which the operations are being conducted and" his orders are being complied mth, and to submit information and recommendations from time to time for safeguarding and protecting the property of the lessor and securing compliance with the provisions of ther'fease and these regulations.

of damages, if any, to the leased premises or to adjacent or cci property belonging to the Government, to report amount aiid value of any coal avoidably lost or wasted, and to make recommendations on tJie action to be tidken to the Secretary of the Interior.

Sec. 4. The mining supervisor, the district mining smuoeoforsupervisor, and the deputy mining supervisor'majr issue fflSTJrtthMI such orders and notices m writing as may be appropriate to " secure compliance with these regjulations, and may order the discontinuance or modification of any operation or method that is causing or likely to cause any endangeav ment of life or property or is in violation of the provisions of the lease or regulations: Pravidedy That such orders are not in conflict with the laws of the State in which the leased land is situated: Andjurther providedf That in cases where immediate danger to life or property is not involved the order and notices of a deputy or district mining supervisor are subject to review, pendu which, if an appeal is made within 10 days by the lessee, Appeal may execution is stayed, unless it be stated in the order that danger of loss of life or loss of the mine is involved, *'®2ScWSSt deputy or district supervisors' orders are subject review by the mining supervisor, and his in turn on further appeal are subject to final review by the Secretary of the Interior, . '

OPERATING SmXRAHOlSta VOB COAL MDraS.

Preserl'be or Sec. 5. To prescribe or approve the methods of protec- SSr o'r' tion from oil and gas weUs through the coal measures and Hon from oil mines both with respect to prevention of leakage of oil ud gai woua. endangering the lives of employees, and also to

prescribe or approve methods of obtaining the ultimate extraction, so w as possible, of coal in the vicinity oil or gas wells,

c<mditi<mfOT Sec. 6. To specify in writing under what conditions a SSed mine, or panel, or other section of a mine from which the

coal has not been extracted may be abandoned by the ofaatM. lessee, and how the section of a mine so abandoned

should be sealed off or otherwise separated from the

other parts of the mine.

Duties Of Lessee.

Lessee shall Sec. 7. The lessee shall observe and carry out the SfpetSS terms of the act of February 25, 1920, and of his lease in accordance nd the opders and writtm notices of the mining supertiiw wdteims visor, district mining supervisor, and deputy mining to o'SSiSt'iSa supervisor, which are in accordance with the regulations state laws* and terms of the lease and which are not in conflict with ' the laws of the State in which the leased land is situated: Promdedj That when the order and notice does not require immediate action for the protection of life or Appeal from property, an appeal may be taken successively from the decision of su-order of the deputy mming supervisor to the district m-minii supervisor, to the mming supervisor, and to the Secretary of the Interior for final aecision as provided in section 4 of these regulations, xztension of Sbo, 8. Accurate surveys shall be made at least every KLSSSfiSIsix months, and the mine-office maps of each coal bed shaU be extended to show the amount of advancement of all the mine workings and all other changes of a permanent character tat have taken place during the six montb preceding the survey, worked-out Sec. 9. (a) There shall be shown on the map of the rear eas to be spejtive coal bed, in addition to the information specified howB on map. locatiou of aU pillars or parts of pUlars

extracted and the territory abandoned in which the pillars have not been completely recovered. Surface build- (b) There shall be shown in outline on the surface map iro'ie?''to** b" the location of all structures or buildings and the loca- Aowft mm tion at the surface of each prospect bore hole appropriately numbered, and Wends on the map or margin thereof shall dbow the etovation of the surface at that point, the devation and thickness of each coal bed praetrated, the elevation of the bottom of the hole, and any other nnportant iirformation concerning same, including the angle and (Urection of drilling where not vertical- BtM priBti of (c) The lessee shall show on the blue print or repro- ?t'opVi'aV'!<l<5**o'* furnished annually to the representatives of the dams, veatiu Icssor, the position of all fire walls, dams, main pumps, fire pipe lines, pmanent ventilating stoppings, doors,

Duties Of Lessee.

ovettasts, undercasts, and regulators; the direction of the ventilating current in the various parts of the mine at the time of making surveys for the extensions of the mine map; aed fire areas, known bodies of standing water either in or above the workings of the mine, areas containing inflammable gas, and areas that have squeezed, profiua of

(d) Where the coal bed or beds dip steeper than 45°, teep-dipimf profiles or vertical cross sections parallel with the ap-maa proximate average direction of the dip and not more

than 1,000 feet apart shall be made on the same scale as the mine maps witii appropriately marked reference points.

is more than 45°, a vertical view shall be prepared on the bed dippimg same scale as tiie general mine map, which will represent

the mine worldly in that bed on a vertical plane parallel with the average strike of the bed or beds, and which will have ipropriately marked reference points thereon.

(f ) Blue prints or reproductions in duplicate of the profiles and vertical views called for in the preceding subsections shall be submitted annually on request of the Tpining supervisor.

Sac. 10. After necessary prospecting has been done on prenmiinary any lease and before permanent operating shafts, slopes, s*lJbStt?S drifts, or tunnels have been made, the lessee shall prepare a preUnunary plan together with vertical sections to indi-commiAi cate so far as known the positions, dip, and thickness each coal bed as indicated by prospect openings and drill holes, and also the character, position, and dip of overlying strata, on a scale of not more than 200 feet to the inch, and show in outUne the princinal prospect and proposed entries, airways, shafts, and structures, including fan or fans, with an outline plan and description of the proposed method of underground development and ventilation, which plan and description shall be submitted to the district mining super-cord'ance visor; and the lessee shall develop and mine the coal the leased land in accordance with the plans submitted, in so far as natural conditions will permit. If conditions are encountered which require radical changes, modified plans will immediately be submitted, accompanied by an explanation to le district mining supervisor.

Sec, 11. In everyseparate mine in which more than men are employed underground on any shift, the lessee provided where shall provide in addition to the main shaft, slope, or drift, Sen"empfoW* an escape way or second means of egress to the surface, a iiuft. which in case of drift, slope, or tunnel exits shall be separated at the surface from the first exit by not less than 50 feet of rock or coal in place; and if either or both exits are by vwtical siiaft or by inclined shaft, the exits shall be not less than 200 feet apart. An escape way or outlet throurn outlet through m adjoining mine which has adequate fadlitiea for escape will be rarded as a satisfactory

Operatotg Hbch?Iations Fob Goal, Min>8.

compUance with this requirement if at aU timM ava4a))le and kept in proper condition for use. If suohadJ<ttmg mine shall be abandoned at any time or laf <5ea8e to operate indefinitely, the lessee hereunder shall be solely responsible for the cost and expense of mamtammg such outlet, and if such outlet shall be abandoned or permitted to become unsafe for use, not more than 10 men ahaU be employed underground in the mine on any one shift untU a second exit or escape way is obtamed and made safe for use : Promded. That where men have been mtombed by an accident, this regulation will be suspended, for ie

purpose of carrying on rescue work. Hoistsand' In any shaft mine m which more tJian 10 men

jSd'Uedare employed underground on any shift, unless there is 'tt'iJrUS means of escape bv drift, tunnel, or slope, one shjrft more than 10 u eQuipped with hoist and cage suitable for boiating or "lowelng men asspecified in sections 21 to 25. The second shaft serving as an escape shaft may be provided witH a substantial stairway with handrails, the flights not over 45° pitch with suitable landnigs at each turn. Houtsrequired Sec 13. In a mine in which more than 100 mi are employed underground on any shift, if the escape diaft is t1f?n%Vomore than 300 feet in depth vertically, it shaU be pro- Ten are em-ided with an adequate hoist and cage and asignalmff Si system for hoisting men, and a qualified and expenenced hoist man shall be available, on appropriate signal from under<round of fire, explosion, inundation, or otHer emergency, to proceed to the hoist and act as hoist man. The hoisting equipment and cages m each of two shafts— main shaft and escape shaft— shal have sicient capacity independently of onc another to hoist out of the mme all persons on any shift m 30 minutes, with due

regard to safety in emergency hoistmg. Emergency 14 In shaft mines over 300 feet m depth m wMcb

iSts7vt?3£over 100 men are employed underground on any shift

emergency ladderway with landings every 20 feet vertacaUy apart and not exceeding 80° pitch A stairway as described in Sec. 12 may be substituted for the

Passageway stcis" At each landing of a shaft there shall be made around shafts. . obstruction a passageway at least b leet

high and 4 feet wide that will enable persons to pass ft?m one side to the other side of the shaft without passmg throueh any compartment of the shaft: Provided, A complrtment of a shaft may be used for a passageway if same is not used for hoisting, when properly floored and roofed over by bulkhead sufficiently strong to protect men passing underneath from heavy falhng bodies Support of Sec. 16. The roof and sides of every travehnroad and SSiXlS'worJdng place shall be made secure by timbering or equate lining and arching, and a person shall not, unlms appointed for the purpose ol explormg or repaurmg,

Duties Of Lessee,

travel on or work in any traveling road or working place which is not secure.

Sec. 17. The lessee shall not construct or maintain on the surface any structure of inflammable material within 75 feet of any opening; nor permit an inflammable structure to be connect to anj of the noninflammable buildings that are within this distance except as follows:

(a) An open timber framework or head frame of timber may be constructed over a shaft, slope, drift, or tunnel. The posts and rafters of any such structure may be of wood if the covering or lining is made of noninflammable material, but under no circumstances shall wood flooring be use(L except in tipple and trestle structures.

. (b) Inflammable material shall not be stored or placed within 75 feet of any mine opening, except while sending down into or removmg such material from the mine, ana except for a day's supply of oil for lubricating machinery in the respective structures.

Sec. 18. (a) The lessee §hall separate intake and return airways and any adjacent parallel entries \iere the coal bed is more than 5 feet in thickness by not less than 50 feet of coal in place. Where the coal bed is less than 5 feet in thickness the pillar between the main intake and return airways shall be not less than 30 feet in thickness except that when the coal is less than 2 feet in thickness the pillar may be reduced to 20 feet, provided the roof and floor are strong and resistant to weathering.

(b) The distance apart of crosscuts or break-throughs between parallel entries or rooms shall be in accordance with the regulations of the State in which the leased land is situated, but the distance shall not be more than 100 feet, except in entries or tunnels where special arrangements are made to carry an adequate ventilating current to the face of each entry or tunnel, the adequacy of such provision to be approved by the district or mining supervisor. In no case shall rooms be turned ahead of the last crosscut nearest the face, nor shall branch entries or tunnels be started ahead of the last crosscut, except when approved by the district or mining supervisor for driving for a connection to obtain a circmt of air or a second means of egress.

(c) The pillar between any entry and a parallel room or panel working shall be not less than 50 teet in thickness, and as much more as may be required in the judgment of the mining supervisor.

(d) Room necks shall not be wider than 9 feet for a distance not less tlian 18 feet in length, unless the lessee is given permission in writing by the mining supendsor to make the room necks wi(&r and shorter than above specified.

(e) Hie coal in chain pillars and room stumps and panel boimdary pillars provided under sections b, c, and d shall be left standing until in the proper course of

No buUdine of l&flaniiBaDlc matertel to

constructed within 75 feet oi

Mini mam thtclnnaii of pillar botwooa bft* tain and retsm alrwayt.

Distance between etoswmta

Pillar between entry and parallel rOOSLBQtl

thas W iNt te

Room neck minimum wMtk and lenctlu

Coal in cliala plUani and rooa

Operating Regulations For Coal Mines,

mining operations the time shall arrive for their removal, following or during the extraction of the room pillars in the adjacent workings: Provided That where the advancing lon-wall method is used all coal may be excavated, in which case pack walls of appropriate thickness shall be built and tne space between tlie intake and return airways shall be tightly packed with rock or sand. Main entries Sec, 19. When any portion of the coal on the lease over 4,wo feet requires for its extraction main levels or entryways for framikaft ventilation and escapeways more than 4,000 feet in length beyond the nearest air shaft or place of egress, ill which area may be comprised the workings in one or more separate coal beds of the same mine, and in which area more than 100 men are employed on any shift, the entries and airways extending to such section or area shall be not less than four in number: Additional Provided. That where only two levels or entries are imfftfifMrftyi. prior to entering such section or area, entry pillars shall be left of sufficient width to permit the driving of the necessary additional passageways to the area. Separated pairs of parallel entries entering the area in question and properly maintained will fulfill the foregoing respective requirements: And further provided That if the advancing long-wall method is used to extract the coal, pillars will not be required, but the number of levels or entryways specified shall be made and maintained in good order through the areas excavated by the long-wall method: And further provided, That if coal on leased land is to be mined from a mine already existing either on the public domain or private ownership, and if, in the opinion of the mining supervisor, there are adequate ventilation passageways and escapeways, the foregoing requinments may be waived with the approval of the Secretary of the Interior. H o 1 1 ti n K Sec. 20. (a) All hoisting equipment used in shafts and StondaSdT ©Sil-slopes shall be of ample capacity, and the design of a acter. commercially recognized safe standard character, and in

accordance with the respective State requirements. Drum iUnses. (b) The drums or cable reels of hoists shall be provided with flanges which will extend at least 2 inches radially beyond the last layer of rope when the rope is coiled on tne drum or reel. BWttaikoi. (c) All hoists shall be equipped with brakes suiiicient to stop and to hold the fully loaded unbalanced cage or skip at any point in the shaft or slope, and said hoist shall have sufficient power to hoist a loaded unbalanced cage or skip.

Electric hoist (d) All electric hoists shall be equipped with protective top-devices which will immediately bring the hoist to rest upon failure of power and will permit the lowering of the cage by brakes after it has been brought to rest through the iaiiure of power.

(e) In shafte and slopes where men are hoisted or loweredy there shall be at least 20 feet of hoistway clearance above the landings at which men enter or leave the cages or cars; and at mines in which over 200 men are employed underground on any shift there shall also be over-arPd'oTelspVed? winding and overspeeding devices connected wiUi the devices or dehoist, or equivalent devices approved by the mining supei visor shall be installed and mamtained to prevent the cie from being overwoimd or from falling if overwound, and from overspeeding considering the charactei; of tlie hoisting equipment and depth of hoisting.

Sec. 21. (a) Cages when used for hoisting men shall have bonnets extending over the space on wmch the pien stand, shall have steel or sheet-iron or wire-mesh sides extending not less than 5 feet above the floor of the cage or of each deck of a multiple-deck cage, and when hoist-

Bonnets, spates.

ing or lowering men shall have gates or doors at least 5 and handholds feet high, closing the entrances to the cage on each decknoiitiasaMB-

when used for men. Each deck of eacn cage used for hoisting men shall have overhead bars, and be arranged so that every man on the cage may have an easy and

secure handhold.

(b) Cages, when hoisting or lowering men, shall be prosecatota

vided with safety catches, capable of bringing to a stop the fully loaded cage within a distance of 10 leet in any part of the shaft or headframe in case the rope or rope connection should break.

(c) Self-dumping cages used for hoisting men shall

be so designed that the platform can not overturn in tlieti,ta<fc

shaft* T-amiln C&Im.

Sec. 22. For vertical or inclined shafts, automatic closing covers, or gates 5 feet high, shall be used at the top landing and hinged or sliding gates at least 5 feet high shall be required and kept closed at the grouiid landing and underground landings when men are not entering or leaving the cages and coal or material is not being taken on or off the cages: Provided, That at the main bottom landing or levels from which coal is caged the gates may be raised or swung out of the way during a period of continuous hoisting and caging cars when an attendant is constantly at hand.

Sec. 23. Cage rests or chairs shall be used at all shaft landings that are regularly used in hoisting or lowering men unless their omission be authorized in writing by the mining supervisor.

All vertical or inclined shaft openings shall be securely Protect itr fenced and the gates thereof shall be so constructed or iSpeTIVad placed that loose coal, rock, or debris will not roll or fall*""*" through them into the shaft. The track at the ground landing shall have a derail device that shall always be kept open except when a car is being taken from or being placed on the cage at said landings. Where a shaft not used for hoisting men or a slope or a suni|) extends below

12 Opebatino Bb6Uiati0Ns For Coal Motbs.

ihd floor of a mine passage or excavation it shall be ade* quately fenced or otnerwise guarded. Sec. 24. Shaft-sinking buckets shall be provided with gamy ho! self-locking safety hooks and, when the shsjt is over 100 uA ccoMhtMa. in depths with crossheads and guides. The mouth of the shait shall be covered, when dumping rock or loading or unloading material, by safety doors or the equivalent of a safe design and construction. Sec. 25. When anv men are employed in the mine or a n du nd e*? - required to enter or depart from the mine between sunset cuad uadand sunrise, there shall be maintained at the top landing of the hoist shaft, or shafts, sufficient light or lights to

enable a person to see the landings and there shall be a light at each undeiround landing used for caging men on each side of and within 10 feet of the shaft or slope at such time as men are employed in the mine. Each sudi landing shall be painted and maintained white, or whitewashed at frequent intervals.

Sec. 26. All flywheels, gears, belts, and all exposed moving parts that are hable to cause injury, or dangerous parts of machinery used in and about a mine shall be ouudi to aui-appropriately guarded to prevmt injuries to attendants Sd putfo]? i>i' other persons. Stairs, platforms, and dangerous walks in or about the mine or stripping operation all be provided with raUs, fences, and gat.

Sec. 27. (a) Any rope or cable used for hoisting or lowering men shall be of metal hoisting cable of recognized standard character and when newly installed m safetr factor the shaft or slope shall have a safety factor of not less ropi than 6, which shall be calculated by dividing the breaking strength of the rope, as rated by the maniuacturer, or in accordance with tests on a sample by the United States Bureau of Standards, by the sum of the maximum lo to be hoisted plus the total weht of the rope when extended to the bottom of the hoistway; or, if the hoistway is inclined, the calculated component of the weights parallel with the incline.

(b) No rope or cable shall be used for hoisting and lowering men when the wear ha reduced the safety factor to below 4.5, as determined by tests of the piece When to digshowiug maximum wear, when on inspection it is found that the number of broken wires exceeds six in any single pitch length or lay of the rope, when the wires on the m>wn of the strands are worn down to less than 65 per cent of their original diameter, or when inspection indicates a dangerous amount of corrosion or distortion: Providedj however j That when such broken wires are reduced by wear more than 30 per cent in cross section, the number of breaks in any lay of the rope shall not exceed three. All hoisting ropes and rope connections shall be inspected once in every 24 hours by some competent person designated for tne purpose by the lessee.' nis ection of inspection a hoisting rope or cable is considered hoiftbig ropes, unsafe or if it shall be found to be below the requirements

Is

set forth in this section, it shall be put out of use for such

(c) Cages, skips, or cars used in hoisting or lowering men shall be connected to the hoisting rope or ring by standard babbitted or zinc-filled sockets, or by clamps, and the

ropes shall be resocketed or reclamped at intervals oVoiuSwU exceeding four months, and at least four feet of the rope to oac. shall be cut off from the end to be socketed or clamped, and clamping shall be so done that at least 80 per cent of the breakmg strength <rf the rope shall be attained.

or reel, and at least two turns of toe rope shall remain onto dm wiml the drum or reel when the cage or skip attached to the rope rests at the bottom of te shaft.

(e) Every hoisting rope shall be treated with oil with some suitable rope-lubricating compound at least ' twice every month. Such compound shall be chemically

neutral and shall be of such consistency as to penetrate the strand and not merely cover the surface of the rope.

office of the mine of every hoisting rope used for hoisting ropes. or lowering men, noting the lenjgth and crossHsecttonal dimensions of the rope, me breakmg load of the rope, the

name and address of the maker, the date of purchase, the date when put in use, the designation of tne shaft and compartment in which the rope is used, the dates of resocketing, reclamping, and shortening, me length of rope cut off at each such operation, the dates of reversing ends, the date when discarded, and the reason for discarding*

28. (a) Duly authorized and competent representatives Bzanmtieu of the lessee shall make daily a general examination of SfA'lf anJSi all hoisting equipment and mechanical apparatus for the hoisting or transportation of men in and about the mine, including skips, cages, guides, ropes, sheaves, hoists, motors, enojines, and boilers; and once each week a more detailed examination shall be ffiven and a memorandum of the condition of the above shall be entered in a record book kept in the mine office. Thorough internal examitoiler inspecnation of boilers shall be made at least semiannually.

(b) If an inspection discloses a defective condition or iMMt la apiuiangement of any apparatus, appliance, or device, which endangers the safety of employees or other sons, that defective condition or arrangement must be remedied before further use endangers life. ,

Sec. 29. Where men enter shaft naines bv cage or skip, Baistar the cage or skip shall be lowered to the bottom of the LTIkp Irior to shaft and raised to the surface just prior to the beginning of a shift and before the men are permitted to be lowered.

Sec. 30. At the top of, and at each landing of a <isting co f't'fl shaft or slope and in the hoisting-('nine house, there shall Jjf be kept posted in a manner easily read a code of signals

X4 Operating Bequlations Wqm Coal Minss.

for use in directing the operaticm of the ces. Said code shall be in accordance with the codes iequired by the State mining laws of the State in which the mine is situated, and if not otherwise specified tlie following code of signals shall be used: (a) When the engine is at rest, one signal, hoist; (b) whm the engine is in motion, one signal, stop; (c) when the engine is at rest, three signaJb, men ready to get on the cage to asceoid; when ihis is followed by return signal from the engineer, me mm get on the cage, and then the proper signal to hoist or to lower shall be given. Additional siraiab to suit iAxe local conditions may be added by the lessee.

Sec. 31. There shall be at least two effective methods Two methods (>f Signaling between the ffligine room and each of the SttiiJIu " shaft or slope landings, one of which methods, in each case, shall be a telephone or speaking tube. The signals shall be so airangea that the eager or person in charge of each landing can sial direct to the hoistman and the hoistman can also signal direct to each of the landings. Calling or rapping on metal shall not be accepted as a proper method of signaling.

Sj30. 32- The lessee shaJQ provide and maintain, in each Telephones mine where more than 100 men are employed underground

gine room, thegroundlandingof theshaftorslope, the principal mine exit of drift mines, the fan building when same is located 1,000 feet or more from the power house or main exit of the mine, and such other pomts on the surface as may be advisable for safety of the employees. The telephone system shall also extend into the mine and telephones be placed on each shaft or slope landing in use and at the mside siding of each of the main haulage roads. The underground telephones shall be so placed that no 20 men shall be more than 1 ,000 feet from the nearest telephone station. Telephone shall also be placed in each refuge and first*aid chamber.

The telephones inside of the mine shall be of standard underground type, inclosed in tight metal boxes. The telephone wires shall be carefully installed and be placed along the side of the entry opposite the power lines. Sec. 33, (a) In any mine in which more than 10 men are (ntiutins employed on any shift the lessee shall pro vide on the surf ace e d w h7e t)r other mechanical means for circulating within the -io/aWem-™® such amount of ventilating current as may be eo. ' required by the law of the State in which the mine is located, or such additional amounts as are specified in these regulations; such fan or other mechanical means and the connection between same and the point of the entrance of the air current into the mine shall be made of noncombustible material; and the lessee shall not set the fan or equivalent in line with the axis of any mine opening, but shall place same at a distance of not less than 25 feet from the projection of the nearest side of such opening, and

Ve

fan

V i d e d more men a

Duxx£S Of Lessee

shall provide explosion relief doors of the full area of the air shaft or airway in direct line with any and all such Fan not to be mine openings in order to protect said fan or other (iJewun any mechanical means of air circulation in case of a minearta* ertwM*.

explosion. Such fan or equivalent must be so arranged that the ventilating current can be reversed quickly.

(b) The main fan or fans used to ventilate a gaseous mine, when electrically driven, shall also be provided with an auxiliary steam or internal-combustion engine, or hydraulic power with suitable belt or driving connection which can be quickly connected and operated shoxild the electricpower fail.

(c) That during such time as the mine is being opened jJ*5®|j;*JJ up and less than 100 men are employed underground ougtaued.

any shift, and with the written approval of the authorized representatives of the lessor, a fan of sufficient capacity may be set up tewporarilj while the permanent fan is being erected.

(d) A mine in leased land may be ventilated by means of a fan of a mine not on the leased land when less permitudimder than 25 feet from any projection of the nearest sidejp,

of the mine opening; no part of the fan or of the housing is to be in line with said opening: Provided, The fan had been installed prior to the date of the lease and the fan and setting conform, in all other respects, to the foregoing requirements: Andfvrther provided, The intake air on entermg the mine on leased land does not contain at any time more than one-fourth of 1 per cent of niethane, as determined by samples gathered by the lessor's representatives and analyses made by the United States Bureau of Mines: Andfvrther providedyThe airway connections to the mine in leased land are protected by rockdust barriers or equivalents in accordance with specifications given m piilicationd of the United States Bureau of Mines.

Sec. 34. Electrically driven auxihary or booster Awuiaryor fans may be used in .nongaseous mines when there is no jiongat#m exposed' inflamiWAble material within 10 feet of the f

and motor. ,

Sec, 35. An electrically driven auxiliary fan may only be used in a gaseous mine when located on the intakinggaMoiu iianM. air current and when there is no exposed inflammable material within 10 feet of the fan and motor, the motor and switch being explosion proof and of a kind approved by the United States Bureau of Mines: And fvrther provided, That there shall always be an experienced gas inspector or fire boss m attendance in the immediate district at all times while the fan is running, who shall make hourly inspections to determine if methane in dangerous quantities as defined in section 38b is passing the fan, and if tixe fan is oiled and running properly. Auxiliary or booster fans may be used either in a gaseous or nongnseous mine when driven by compressed-air engine pr equiva-

OPKBATIHO BS6X7IJITIOHS FOB GOAL MmBS*

oaubybrt auxiliary fan within a mine shall not be

uam. considered adequate if the air currents are caused to recirculate

by such fans to an amount exceeding 10 per cent of the volume circulated by the fan. quimtitySwn Icssec shall pfovidc a ventilating current

tuatizLg enomtof not less than 100 cubic feet of air per minute for each person employed undeiround on any one shift and 500

cubic feet for each mule or horse; or such laier amounts as may be required by the regulations of the State in which the lease is located ; said ventilating current to be measured in each of its various splits at the last entry, crosscut, or break-through nearest the face, for the of men served by that spUt of air, and not more one split ot air than 75 men shall be employed on any one split of air current. current, unless the minii supervisor gives written permission temporarily to employ a laier number, aautj of Sec. 38. (a) A working place, entry, or passageway termfuttd" shall uot bc deemed normally in a fit condition for men to work or travel in if the air therein, as determined by chemical analysis by the Bureau of Mines of at least four samples in dupUcates gathered at intervals of not less than two days apart by the mining supervisor, district mining supervisor, or deputy mining supervisor, each show on a moisture free basis more than li per cent carbon dioxide or less than 19 per cent oxygen. The lessee upon being notified of such finding shall immediately undertake measures to improve the quaUty of the air of said working place or entr} Detematton Qy) YoT the purposcs of these regulations, a mine or mine or dtltdot portion of a mine shall be deemed gaseous if so defined tewBM. jy mine inspection department of the respective State in which the lease is located, or if the mining supervisor or district minii supervisor shall, on three occasions, not less than twx) days apart, determine by tests with approved safety lamp or by chemical analysis the presence in any district of the mine of 2 per cent or more of methane in the atmosphere of the working place or entry, or if the return air of any ventilation split shows by analysis of three samples tien in duplicate at least two days apart that each contains one-half per cent or more of methane, the mine or a district of same shall be deemed gaseous: And further provided That if any similar occurrence of methane takes place in more than one split of ventilating current, the entire mine shall be rated as a gaseous mine. Aftsmonths (n) If in a nmie, or district of same, oetermined as

Mcond series of , ' , , ha ha

tests may be above to bc gaseous, the mme examiners nnd no txre damp Sue jftwiSi for a period of six months following first determinati the ontto*" mining supervisor or the district mining supervisor may, at the written request of the lessee, make a second series of tests identical with those previously specified to determine if the mine or district continues gaseous. A second finding of a gadeous state shall determine the mine to be gaseous for a period of at least two years, when a similar series oi tests may be made to detemune whether the

Duxiks Of Lbssebl

mine continues gaseous, and similarly, each two years, tests may be made. If after any series of tests above fayorabia specified; the mining supervisor, from the favorable tests and recresults of the tests and of the mine examiner's records, SJSiJSconsiders the mine or district in same can be rated nongaseous and without greater hazard than presented by nongaseous mines in the region, he may so rate tOiM mine and notify the lessee.

(d) From the tune the mine or district of a mine is permuled in first determined to be gaseous until determmed by tii© StTtrutTbt mining supervisor to be nongaseous for the purpose of oniy iemiatfthese regulations; and unless rated nongaseous the respective State mine inspection department, the lessee shall permit no open lights to be used in said mine OT district, but only looked ''permissible" safety lamps, either flame or electric, approved by the United States Bureau of Mines, shall be used. Entrance to

Sec. 39. When a gaseous district has been established ijgwaanaOT in a mine, or a mine has been determined to be gaseous sir ® under the foregoing regulations, the lessee shall cause to be stationed in each entrance to the mine or gaseous district of the mine where men enter, fire bosses or examiners, who shall examine the lamps of all men entering such district or mine to determme if they are permble flame or electric safety lamps and are in a sale condition. The lessee shall not permit men who carry open lamps, open lights, matches, smoking tobacco, cigarettes, or cigars to work or enter gaseous districts or gaseous mines. When a gaseous district has been established within a mine, a fire boss or examiner dial remain stationed at each entrance so long as there is a shift at work in that vicinity, to prevent the entering of men with open lamps, open lights, matches, smoking tobacco, cigarettes, cigars, or moans of causing ignition of gas other than explosives, which shall be handled and as hereinafter specified.

Sec. 40. (a) The lessee shall appoint a mine superintendent who shall have atleastfive years' exnenonce ni mtondw and around coal mines, who has a practical knowk dge of mine gases, timbering and mimng machinorv, and whose qualifications are at least equivalent or superior to those required for underground foremen in o;asoous mines as specified by the respective State laws, or if not specified, tiie qualifications shall be in accordance with tke best reqiiirements of the mininc: reo;ion for similar positions. The mine superintendent may have jurisdiction over one or more mines on the lease. Lettee may (b) A lessee duly qualified in accordance with the serve as superforegoing may serve as superintendent. quaufled."*

Sec. 41. (a) The lessee shall appomt for every ppVii|;£5il employing more than 25 men underground on any oncfled hom tini st ixk each separate mine on the teased kad an e%-

ee shall

Operating Regulations For Coal Mines.

perienced mine foreman of qualifications of at lt five vPars' experience in or at coal mines and with a good" practical knowledge of mine gases, timbering and mine machinery, and otherwise in accordance with the requirements of the respective State regulations, who shall visit and inspect from time to time all accessible parts of the mine and who shall be in responsible charge of the mine underground. Superintendent When there are 25 men or less employed underforliy whSn around on anv one shift bv the lessee, the superintend- S3JSSl5r"ent mav also 'serve as the mine foreman, provided he is qualified to do so bv the respective vState regulations. Avpointmaat Sec. 42. (a) In anv mine in which more than 100 men Sli5 are employed underground on a shift, the lessee shall appoint at least one experienced assistant mine foreman, with qualifications and duties similar to those of foreman, and an additional assistant mine foreman for every additional 100 men employed underground in that inine. Mte i-reman (b) The foreman or an assistant foreman if duly may tefw M fire qualified in accordance with the respective btate regulations and his other duties permit, may also serve as

&-e boss or mine examiner. Appointt Sec. 43. (a) The lessee shnll appointasufficientnumber of fire boMWB OP of fy-p bosses or mine examiners to examine every working place and accessible part of the mine within three hours prior to the entrance of a shift of miners, when shifts in the same district of the mine do not immediately succeed one another, to determine if every place is free from a dangerous quant itv of fire damp or noxious gas, and if the roof and other conditions are safe for the workmen. Any place that has been undercut by a machine, or in\which the coal or roof has been blasted within less than three hours prior to the time of entrance of a shift, shall be examined by the fire boss or mine examiner before the workmen are permitted to ©ntor.

oneflrebossfor (b) In auv gaseous mine there shall be at least one 24toUdtoS° (Pf'rienced "fire boss or mine examnier for every group Siinfc of 75 men or fraction thereof employed underground.

Fencing ud Sec. 44. The fire bosses or examiners sliall fence oft 5/*,?5nJand mark all dangerous places to prevent the entrance vtMi of men into such places, shall record in chalk on a backboard or equivalent means, at the entrance of each district, the places which have been marked off, and shall Station themselves at the entrance to such a district at or near the mouth of the mine to warn and stop miners who normally would work in places found dangerous from entering until the dangerous conditions have been remedied under their supervision or that of a duly accredited mine official, withdrawal Sec 45. If at anv time it is found by the person lor SU'°coS-the time being in charge of the mine, or any part thereof, " that, by reason of the prevalence of mflanunabie or

Duties Of Xjbsssb. 19

noxious gases, or of any cause whatever, the mine or any place in the mine is dangerous, every workman shall be withdrawn from the mine or place foimd dangerous. For the purpose of this section, a place shall be dtefflned dangerous if the percfflitage of inflammable gas in the general body of the air is found to be as mu(m as 2 per cent, or as much as 3 per cent of carbon dioxide, or if there are indications of an extensive fall of roof or of a serious "squeeze" over any section where men are working.

Sec. 46. In a gaseous mine, when the fan or fans have vomMitoaBaccidentally stopped or have been shut down for repwrs, glf/JJ,'"!- or the ventilation is othwise interrupted for a period of /entiiation of more than 15 minutes; or in a so-called nongaseous nod. mine, when the fan has been shut down for more than four hours, no men shall be permitted to enter the mine until the fan has been in operation for two hours and the fii'e bosses or mine exanuners have returned to the surface and reported to the mine foreman that they have examined aUthe places and it is sale for any or all of the men to enter.

Skc. 47. When any body of methane or fire damp of SemoTal of an amoimt that would be a menace to the men in the mine or in a district of the mine has been found in any working or workings, no men other than the repair men accompanied by the mine foreman or fire boss or bosses, shall be permitted to enter the mine until the body of the gas has been removed by means of the air current, through the erection of brattices or changes in the ventilating currents, and no open lights shall be pwmitted in the mine while this is m progress.

Sec. 48. The quantity of air in the main current in every split shall be measured with an anemometer approved equivalent at least once every week by the mine foreman or fire bosses and tered m a book kept in the mine office, with a record of the findings of dangerous gas.

Sec. 49. The fan at mines in which 25 or more men are eniiloyed underground on any one shift shall ec| nipped with a recording instrument by which the ventilation pressure shall be continuously registered- The r- istration chart for each day with the date thereof shall be kept in the office of the mine for at least one year.

Sec. 50. The fan shall not be stopped, reversed, or eTtopp'ed changed in speed except by orders of tne official then charge of the underground workings. In case of ex-official in charge, plosion or fire, if the underground official in charge can not be reached, the superintendent of the mine, or in his absence, the oliicial in charge of the surface, if thorouglily conversant with underground conditions, may take the responsibility of stopping, reversing, or changing the speed of the fan, provided this procedure is in accordance with the respective State regulations. It should be fully understood, and a notice posted in a

recair

Operating Regulations For Coal Miies

suitable place in the office of the mine and in the fan house t( the efVect that the fan shouUi not be stopped, reversed, or chanjed in speed under any condition except bv direct orders as above. 51. (a) The fire boss or examiner shall record tlie ditions by Are fin jings of dangerous or gaseous eonilitions in accordance horn or respective State regulations, and in addition

each fire boss or examiner shall have a l)uok in which these findings are recorded, and on leturning to the surface shall place same in the ofiicial office of the mine, or if this office is more than half a mile distant from the exit, shall temporarily place it in a suita])le and secure place adjacent to the exit, should his duties req[uii'e reentering the mine. Tire-boss re- (b) The reports of the fire bosses or mine examiners cSVie'raad shall be assembled and copied once a day in a record book kept in the olhct of the mine and signed each day by the lire bosses or examiners.

The foregoing provision shall not be construed as preventing the following out of any State regulations, but shall be considered as supplementary. Sealing off Sec. 52. (a) All workcd-out areas, or areas abandoned aano Vpermanentlvortemporarilv, that can not be so ventilated proof Stoppings, as to prev(*nt the accumulaiion ot explosive and noxious gases, or by reason of the conditions can not be dailv inspected ])y duly authorized mine ollicials, shall be sealed off by fireproof stoppings constructed of strong concrete or masonry of solid substantial character not less than 30 inches thick and keyed or recessed into the side walls; and a pipe with locked valve shall extend through the stopping for the purpose of testing by the foremen or mine examiners the gases b(4iind tli( stopping. Bore holes to (b) When inflammable gas is liberated in sealed areas S!rfa?o in such quantities and und(T such pressure that it leaks gas accumuiatlKough the stoi)iMng or surrounding pillar, and enters the air current which ventilates active working places, a bore hole shall be drilled from the surface, unless of an unreasonable depth. All the drill holes for drawing off the gas shall have casings not less than 3 inches m diameter. The holes shall be located to enter the highest parts of the sealed area. The casuigs shall ext(M\d at least 10 feet above the surface and to guard against propagation of an ignition of gas at the top of the casing from extending down the bore hole there shall be a triple safety-lamp ijauze placed in or over the casing, and there shall be a balanced check valve in the casing to prevent entrance Gasdrampipe of aiT when pressuTC withui the sealed area is i)elow atmosthroucii Btop-pheric pressure. In the event that said bore hole is not feasible, or if drilled does not relieve the gas ])ressure behind the-stopping, a pipe line not less than 3 iiK'hes in diameter all be put through the sto{)ping, and to discharge the gas shall extend into a return airway that does not ventilate any hve working or haulage or traveling way. The end of the pipe shall be protected by

Duties Of Lessee,

gauze and a check valve and that portion of the mine

shall be deemed gaseous.

Sec. 53, When crosscuts or break-throughs arc no ventiution longer used for the passage of ventilation they shall bcrepa*" closed on main haulage entries with stoppings mad( of incombustible material and sealed as air-tight aspossil)]o; stoppings in the crosscuts between main entries shall be constructed of concrete, brick, or rock masonry or other noncombustible material made as air-tight as possible. The stoppings in crosscuts or break-throughs of r<K)ms and panels or temporary entries may be constructed of wood or of rock and dirt, but wherever important for the circulation of air to the face they should be coated with plaster.

Sec. 54. When any working has approached within Drming holes

„ „ p A I J 1' in advance when

100 leet oi any portion ot a mine not known to he iree approachinc

from or dangerous accumulation of water, the advance

workings or headings shall not exceed feet in width and

there sliall be constantly at least one bore hole, IS feet in

advance, drilled centrally in the face of (Mich heading; and

when within 50 feet of conjectured workings, in addition

to the center hole, there shall also be drilled in advance

at least two holes for each 9 feet advance of the face, one

on each side of the heading at an angle of 30° with tUo

axis of the entry or workings, which holes shall be drilled

at least 18 feet deep.

Sec. 55. (a) The followinj regulations govern the Electrical reg installation and maintenance of electrical equipment in and about mines on the leased land.

(b) Where the difference of potential between any two points of the circuit does not exceed 300 volts, the supply shall be deemed low voltage.

(c) Where it exceeds the fore";oing voltage and does not exceed 650 volts, the supply snail be deemed medium voltage.

(d) Where it exceeds tlie latter voltage, the supply shall be deemed high voltage.

Sec. 5G. No voltage high(T than medium shall be used Lmittatioii of underground, exr<'pt that high voltage may he used for d'e/oaad transmission or for ap|)lication to transformers, motors, 'b®- or other apparatus in which the whole of the high voltage winding is stationary.

Sec. 57. All high-voltage power lines installed ground shall be in the form of insulated, lead-covered reqiiiremeiitg, cables, which shall be armored or otherwise eii'cctively protected against abrasion and the armor shall be electrically continuous throughout and be effectively grounded. Such armored cable may be placed in conduit underground or supported along the ribs or on |U'ops.

Sec. 5S. LocouKtives, portable pum])s. coal cutting maclnnery, and other portable electrical machinery use(l un*dercutVinff mine, or on roadways traveled by men, shall use only to low voltage, low-voltage current.

Operating Mgtjlations Fob Coal Mines.

sigaai wire; Sue. 59. Signal wire cii'cuils shall not use over 30-volt

limited to tO ,

volts. current. Supports of Sec. go. (a) All underground electrical power cables and

iLd'ibier wires unless provided with grounded metallic covering or

as specified in section 57 shall be supported by efficient

insulators.

Guards for (b) Cables and power wires unprovided with grounded wheilies Me metallic covering or equivalent shall not be fastened to the coal, roof, or timber with uninsulated fastenings.

Overhead cables or wires on the traveling side of entries or where men cross under, when less than feet above the rail, or, if there are no tracks, 7 feet above the floor, shall have troughs or side-board guards, or may be placed in a channel in the roof; the guard wbere used shall extend 2 inches below the sag between the supports and be so arranged that a man's head or cap will not come in contact with the cable or wire. Power wires along the rib in traveling ways shall be fenced or otherwise protected.

Trolley wire (c) AH trolley wircs shall be placed at least 6 inches ptecffiMmt. outside of the rail of the track, and wherever possibU on the opposite side of the passageway from that used by men for traveling on foot; and where the trolley wire is less than ij} feet above the rail and on the same sides of the entries of passageways used for traveling or where men cross under it shall be protected by troughs or side board like those specified in section OOb. Mari trips run on motor roads does not construe that the road is a traveling way within the meaning of this section. tTttderground Sec. 61. (a) All underOTound electric stations shall be fireproof ed and at all such stations at least one chemical fire extinguisher of a kind approved by the United States Bureau of Mines shall be kept for use in the event of a fire in the electric apparatus. Wectricai in- (\y) AH electrical installations are to be installed and £rfis?me?hod. used so as to insure the greatest safety to workmen.

waraiagsigns (c) Where high voltage is used, fixed warning signs shall be conspicuously posted, and the color of the insulation used on high-voltage wires in electrical stations at transformers and switches shall be dift'erent from that used on the medium or low-voltage wires. Trouey and Sec. G2. In any mine which is termed gaseous or in ?o\VmoViveri which more than one-fourth of 1 per cent of inflammable gMttse or crs is found in the moving air current, trolley locomotives or storage-battery locomotives that have not been approved by the Bureau of Mines as permissible for use in gaseous mines may be used only in entries or passageways ventilated by intake air; that is to say, air that has not passed through or received the return from rooms, chambers, or abandoned areas; locomotives may be used, however, for hauling coal from the face of the back or parallel entry, provided tlie luiulage is through a crosscut to the intake entry that is located nearer the face than any room or branch entry turned off from, or connected

with said back entry in which the air current is returning, and also provided the air current does not contain over onefourth of 1 per cent of mflammable gas as determined by sampling and analyses.

Sec. 63. All electric locomotives Shall be provided and with efficient headlights, and the front end of all emtrips of cars hauled by other mechanical means shall be provided with a light of an intensity of not less than that used by miners, and on the rear of any trip hauled mechanically or by animals from partings or gathering places there shall be displayed a red light.

Sec. 64. If at any time in any place in the mine percentage of inflanmiable gas in the general body of themfhaneuprMair in that place is found to exceed 2 per cent, the electric current shall at once be cut off from all cables and other electrical apparatus in that place, and shall not be switched on again as long as the percentage of inflam* mable gas exceeds that amount.

machines, pumps, and other machines, when electricidly etc, m driven, and uninclosed electric switches shall not used in gaseous mines or gaseous districts in mines unless the motor and connections and inclosed switches are of a kind approved by the United States Bureau of Mines as explosion-proof.

(b) When electric cutting machines and drills are TMts required being used in a gaseous mine or district, in addition to oVTisTr??t3 frequent tests for gas to be made by the machine vrun-wh en euctno ners, the lessee shall be required to have a fire boss orued. bosses, or examiners make tests for inflammable gas each

half hour in each of the places where machines are being used, or are to be used within the half hour.

gas, and if 2 per cent of gas is found in the general body examiners.

of the air of the working place or in a large pocket, the machine or machines in the vicinity must be stopped and the men withdrawn from that district until the gas has been diluted and carried away by the ventilating curreMt.

Sec. 66. In gaseous mines electric lighting circuits may be used only at the foot of the intake shafts and in thejeom/ intaking main roads in which the air current contains not more than one-quarter of 1 per cent of inflammable gas as determined by samples gathered from time to time by the district mining supervisor and analyzed by the limited States Bureau of Mines.

Sec. 67. (a) In every mine in which electric drills or cvt-owt cutting machines are used, the portable cables shall beoikW ' connected to the power line by interlocking safety switches accessible to the working place where drilfe or undercutting machines are used and within 500 feet of the point of each installation of pump or auxiUary fan.

bjPEfeATING REGtiLA*IOirS tOlt COAL MllffES.

strata (b) Cut-out switches in the trolley lines and lighting circuits shall be placed at the mouth of each branch entry aud elsewhere at distances not exceeding 1,000

feet. . Electric cur- (c) Elcctric current, by means of cut-out switches, JV'oauuTs.d shall be cut off from districts of the mine when men M-e put! rf MiMs. jot working in such districts, and wires permanently disused shall be disconnected from the source of current, itgto of 111- Sec. 68. Specific details regarding the installation of electrical apparatus shall be in accordance with the published recommendations of the United States Bureau of Mines at the time of the issuance of these regulations. Manin charge Sec. 69. At a miuc where electricity is used underquipment Shan ground for power purposes, the lessee shall appoint a man P"'y to be in charge of the electrical equipment who is fitted aTwoma. position by ability, training, and experience. The

character of the "equipnient will determine the qualifications of the mine electrician and he shall be thoroughly familiar with the operation and maintenance of the equipment in his charge. Precautions in Sec. 70. When mining operations approach oil or gas giSTw °" wells or bore holes which may contain gas under pressure, the lessee shall present his plans of mining the coal m proximity to such holes to the mining supervisor , for approval. The plans shall provide that the coal be extracted as completely as practicable with safety and m such manner that the well be not damaged, and that precautions be used against sudden liberations of a body of gas or oil or accumulations of liberated gases; the mme ventilation shall be so arranged that any gas liberated shall enter the return air current and not be circulated through the active workings of the naine. locomotives or Sec. 71 . (a) Locomotives aud other internal-combustion cbu.tlon'n- engines, pumps, hoists, and other machines shaU not be Stefn used in a gaseous mine or district, and may only be used mines." in tuniiels, drifts, and entries where the air current is suflicient to dilute and render harmless the exhaust gases, and to this end the percentage of carbon monoxide ffiven off by the exhaust shall not exc(ied two one-hundredths of 1 prv cent of the air current. The air returning from the liaula"'e road of the locomotive and other mtemal-combusti(m engines shall not be circulated through the active working places. . . i

Exhaast of (b) Wierc the exhaust of a stationary mternalgaioumemiBAs. combustion engine can be pi|)ed to the surface, this wm be considered an adequate provision permitting the use of sucli engine, if in otlier respects the installation is properly made whh regard to )prevention of fire or explosion resulting from the use of t le engine. , , ., j .1. Traasporta- (c) Gasoline or other highly inflammable oil used m the SSfiSSSA*' internal-com})ustion engines when taken mto the mme must be in tight containers to replace the empty containers of the respective locomotive or engme, and m no

event shall such inflammable Uqiiid be poured from one

container into another in the mme. Method of

Sec. 72. (a) Hay, straw, or smular hiy mtlammaWe mdiur jay material taken into a mine shall be m compressed bales or covered with tarpaulin or in a closed car and shall not (b) Hay sent into a mme shall be promptly delivered to underground the stable and stored m a locked compartment ynth fireproof lining and door. The amount of hay stored underground at any time shall not exceed the amount normally consumed in 48 hours, except that when public hohdays occur together sufficient supply may be stored to last over

Sec. 73. (a) Not more than one barrel or tank holding 52 „LutTUatinj crallons or I. ss of lubricatmg oU shaU be taken mside of and.fw* to any mine at any one time, and there shall be not exceeding two barrels of oil in the mine at one time.

(b) Such lubricatmg oil shall be kept m a recess or chamber in which there is no exposed inflammable material, such as timber or coal, and which has a cement floor; such chamber shall be provided with a self-closmg iron or steel door set in an iron, concrete, or masoniy waU, and said chamber shaU not be located within 100 feet off any

Buckets or drip nans shafl be used for catching the drip or leakage from the oil barrels or tanks. A supply of sand shall be kept m a suitable container located not in the chamber but near by for use in case pf Are. Sec. 74. (a) To lessen the danger of coal-dust esplooo

Bl-dut ezplosions

in every mine producing dust of an explosive charactei-, unless the floor, roof, and sides of the roads are naturally wet, arrangements shall be made and methods

adopted, as follows: , , j. xi. incio.ia*

(b) When the coal in screemng and loadmg on the surface produces much dust and there is a downcast shaft witttajioof,rtor within 100 feet of the screens and loading chutes, the top

of the downcast shaft shall be surrounded by iron sheeting or other noncombustible material for a height up to the

level of the upper landmg. - j i.™™tion of

(c) Mine cars shall be constructed and mamtamea as tight as possible and loaded in a way to prevent coal orti. coal dust from escaping from the cars while m transit. Tight-end cars employed in connection with rotary dumps shall be used where practicable; otherwise, tightfitting doors or gates shall be employed;

(d) The floor, roof, and sides of haulage fflitnes shall be systematically cleaned to prevent, as far as practicable,

coal-dust accumulations; Appucationof

(e) In mines and parts of mmes which make or m&j waternonij make dust of explosive character, as may be determmed

by samples gathered by the mining supervisor and tested, by the United States Bureau of Mines and that are not naturally wet, the systematic and regular apphcation of

26 OPEBATING EBQUlATIOirS FOB OOAL MINBS.

water, or rock, or shale dust shall be made to render the coal dust inert;

(f) If water is used, the dust must be made wet or washed down from the floor and ribs, and the floor dust must be so wet that it can not be raed into the air by concussion.

(g) If the dqr rock dusting meUiod is used, there shall be sufficient rock, ale. or other inert dust added and distributed systematically along the entries, slopes, tunnels, and escape ways so that the mixture wiU not be explosive when brought up in suspension in the air; to

Betennination this end, the ash content of ie mixture shall be deterof dust by mined, from time to time, by sampling and analysis by the lessee in accordance with the prribed methods of

the United States Bureau of Mines. The ash content plus the moisture sh not be less than 75 per cent or the rock dusting must be renewed in that portion of the mine where the deficiency is thus indicated. Boefe-dvst (h) Inall dry districts or panels of mines not naturally Kes'tfpaS" wet throughout, rock dust or shale dust barriers of a to Specified or approved by United States Bureau of

c<nuteGtlon with

Mines shall be erected and maintained at the entrance of AjotBtatadaes. district or panels and in all connections to an adjoining mine.

deVeio ol lessce may develop a mine on his leased

uVtedtract tract from an adjoining mme not on the pubUc domain, gSf Xe!"*' or from adjacent leased lands, under the following conditions:

(b) If the mine not on the public domain conforms to all the sections in these regulations that relate to the safety of the mine and its employees;

(c) The only connections oetweOTi the mines shall be the main haulage road, the ventilation entries, and the escape ways; that is to say, there shall be no unnecessary connections through the boundary barrier pillars between the mines. These barrier pillars shall not be extracted until both mines are about to be exhausted and aban* doned unless with the consent of the mining supervisor;

(d) There shall be rock-dust barriers placed in the connecting passageways through the boundary barrier pillars in accordance with the preceding subsection 74h;

(e) Ample ventilation shall be maintained in both mines in accordance with previous sections.

(f) Free access for inspection shall be given at all reasonable hours to the mining supervisor or other representative of the Secretary of the Interior in said connecting mine not on the pubUc domain.

(g) The orders in writing of the mining supervisor in accordance with the terms of these regulations shall be obeyed with the penalty, in case of violation, of suspending the operation of the mhie on the leased land.

Tintr Sec. 76. It shall be the duty of the lessee to provide lYsh e d Ys whenever needed at or near the place where needed for use such timber and other material and supplies as are

tiUnSS 09 UBSSESA

necessary to the proper and safe conduct of the operatiatt

''Sec.'77!%) All explosives except those for immediate use inthe mines as specified liereafter shaU be kept m sur- SHU. face magazines, which shall be located away from active or used mine openings, buildings, dwelhngs, and places where persons congregate, at distans proportionate to the quantity of explosives as specified by the United States Bureau of Mines ; where thelocality is mountamous, modifications of such distances may be made with the written approval of the mining supervisor, if the natural

lining and flooring so constructed and mamtamed thates not to be there" will be no exposed nails, may, with the written -cted approval of the mining supervisor, be used place of a surface maga2sme if adequately ventilated Md with sufficient cover, surrounding pillars, and strong bulkheads not to be dislodged in a manner to endanger a mme, building, or dwelling. The surfwse entrance to such magazine and the ventUating duct shall be guarded by fences, gates, and the appropriate wammg signs. In no case shall the magazine have any COTmection with any part of a mme in which mm work. When the entrance to the magazine is a drift or slope which pomts toward any active or used mine opening or toward any buildmg or hicliway, coming withm a distance speeihed m tue tableof distances for the quantity of explosives stored, an earth barricade shall be erected opposite to and as

high as the entrance. , m

(c) Detonators or blasting caps shall not be swrea

gepaiato maga-with

other explosives but in separate magazin. bm.

(d) All such magazines shall be tinder the charge of a competoiit person or persons designated by the lessee or his aent and kept securely locked except whrai said authorized person or persons are on duty at ihtsa respective magazines. , „ , J. J J VneAilnet

(e \11 storage magaasines shall be consfcnicted maintained in accordance with the irablished specifications of the United States Bureau of Mines at the time ot pMUea-approval

of these regulations. , , , . i hawme ex-

Sec 78. (a) Th awing shall not be conducted m explosive pi-J*,, stora<e ma<'azines and a thawing house, where necessary, tiono' tJummg shall be located not less tito 250 feet away from explosive storage magazines and at least 300 feet away from any mine opening or structure, but otherwise located in accordance with subsection 77a. Thawing must be done in accordance with published recommendations of the United States Bureau of Mines. p,„.og„e.

(b) Explosives of whatever character shall not bepi-'i',,; thawed, kept, or stored in dwellings or other buildings on leased lands, except in the magazine and storehouses bow MtM. desi<nated by the lessee and in accordance with these regulations.

OPERATmG REGULATIONS FOR COAL MINES

mine Hiines where the explosive is distributed to

the miners underground, the distribution shall be done as soon as the explosive is taken into the mine, and in the manner set forth m section 84.

stortof %x- Inmines where explosives for blasting operpiosiTM under-at ion are handled and tlie holes charged by the foreman or dcsignatfd shot hers and it is necessary temporarily to store ex[)losives, this storiige shall be done in suitable magazines made in the solid coal or rock at least 300 feet distant from any shaft or mnin slope or 50 feet from any traveling way or intake airway, and shall be provided with a strong door whicli shall be kept securely locked except when entered by the person or persons authorized to enter the magazine. Not over 200 pounds of explosives shall be placed in any one magazine. Such magazine shall be cleaned b(fore putting in each fresh supply of explosives. Explosives in excess of 24-hours' supply shall not be taken into a mine and stored in a magazine in excess of the exj)ected 24-hours' requirement, including any surplus remaining from the previous day.

Amonnts of Sec. 81. In mines where the miners charge their own mitted in pos" blasting liolcs uot morc than 10 pounds of black powder session of mm- (j. black powdcr not more than 6 pounds of

permissibles or other high explosives may be in possession of any one miner, if as much powder or permissible or high explosive is permitted to be in his possession by the respective State laws, and not more than twice the respective amounts may be in possession of two or more miners who are working in the same place. Minerstokeep Sec. 82. The lessec shall require the miner, or miners, tfght wooden working in the same working places to keep the powder and high explosives or permissible explosives in portable tight wooden boxes, each having a lid which laps over the sides of the box and is strongly hinged or has l)attens that engage under a strip securely fastened at the back edge of the box. Battens shall be placed over all cracks so that the explosive may be protected from sparks, llame, and water. Fuse and cartridge paper may be stored with the explosives. No detonating or blasting caps, and no tools or pieces of metal, matches, or oily material shall be kept in the powder or explosives box. The powder box shall be placed in a crosscut or recess at such distance from the working face that there will be no danger of its being struck ilyig pieces of coal or rock or from ignition by blown-out shots. Blasting caps Sec. 83. Blasting caps or detonators shall be taken from* into the mine in separate containirs from other explosives, laotives. gjjd shall be transported and kept in an adecjuate moisture-proof container. Where miners are permitted to charge their drill holes, said container shall be placed in a hole or recess in the rib at least 20 feet away from the

Duties Of Lbssbe.

point where other explosives are kept and where there is

no danger of being struck by flymg missiles from blastmg

or from a fall of roof. u- U l Receiving and

Sec 8-i (a) In mines or parts of mmes m wmcn eiectransporting tricity is used as a source of power, when the power expioUT. u cu-cuit is not completely cut off while taking explosives in quantity for further distribution into a mme, these explosives 'shall be transported only in a closed powder Miners carrycar or box constructed of electncaUy nonconducting material, and with no bolts or nails exposed on thertjdtomininside of the container; and no persons otner than ex-uc container*, plosives distributors and men necessary to operate the trip shall ride m or on such trip carrymg explosives m

"(b) The lessee may permit men to carry their individual supi)li(s of explosives into the mine, provided the explosive and detonators are being earned in separate nonconducting covered containers.

(c) The lessee shall permit only authorized persons to issue explosives to miners, and explosives shall be issued only in fiber or electrically nonconductmg contamers to miners as they enter the mine or to them at underground distributing points. No smoking shall be penmtted by men encracrod in transportinor explosives or by anyonem the vicinity of exph)sives being transported or stored. Electricity

Sec. So.' In mines where electricity is not used as a

power lines cut

source of power or in mines electrically equipped, if the off inteaMportelectric current is cut off from other than properly biSk. installed lighting circuits when explosives axe being transported, explosives in bulk may be taken into the mine in an ordinary mine car when propelled by man,

animal, or cable. . , , , ,1. .

Sec. 86. (a) In anv mine or part of a mine that by the P..u.ibi.

rcnilations is termed gaseous, no explosive shaU be quedta employed other than permissible explosive, and this shall be used with due regard to the requirements for permissibility specified by the United States Bureau -of Mines

schedule of tt'ts

(b) In gaseous mines u shot shall be fired only after be tests with a miner's permissible safety lamp or an equivalent approved by the mining sunei visor have determined

that less than 2 per cent of intlammable gas is present and inspection has been made showing that there is no accumulatit)n of dry hdlammable coal dust adjacent to

the drill hole: iWlV/ '7, Alternative

(c) That other explosives than permissible explosives jfjYcYiri*! may be used in a gaseous mine or district untd such tunefw mbUm. as thev prove dangerous to life and property, if the shots

are fired elect ricallv hom the surface when all persons are out of the mine. The electric firing circuit i\all oe .installed and maintained in accordance with published recommendations of the United States Bureau of Mmea.

Operating Regulations Tor Goal Mines.

Nonpermissibie sy nono;ascous mino or part oi mine tliat

explosives may , . T , i i i i

be used in non-by these regulations IS termed nongaseous, black powder 55dV*r*?e?tafn or Other nonpermissibie explosive may be used for conditions. blasting until there may occur an explosion of gas or coal dust originating from the blast as determined by the miniiig supervisor or d istrict mining supervisor : Provklcil, The shots shall be fired only after inspection by authorized persons and liked electrically from the surface when no one is the mine; or fired by shot firers appointed by the less(e when all other persons except the shot firers and ofiicials authorized by the lessee are out of the mine: Aitd further provided, The charge in any hole shall not be more than 5 pomids of black powder or equivalent of other explosive: And further prmnded, No shot shall be fir(?d by shot firers or electrically from the surface if in the opinion of the shot examiuers or shot firers it would be a shot likely to blow out.

Depth ofdriu Sec. 88. Holes drilled in coal for explosives shall not hoimiB eoflL 4 depth, unless the coal is of greater thickness than 4 feet, m which case the hole shall be of a length or depth not greater than the thickness of the coal that is being removed, except when the coal is undercut or sheared, the length or depth of the hole may be greater but shall be less by inches than the depth of be?hwd'Snd the undercutting or shear. No lioles underground shall toed which be charged and fired when the burden of the shot is too toogxMt.* great; that is, if the distance from the inner end of the hole measured at right anghs to the axis of the hole does not reach a free face within a distance of 5 feet in ''shooting oft' the solid,'' or 6 feet where the face has been completely undercut or sheared. Btmmld*w\th Sec. 89. All shots that are charged with an explosive noncombttstibie. gball be ''stemmed" with noncombustible material and "tamped'' by the use of a wooden bar and said stemming or tamped material, after the tamping is completed, shall extend to the outer end of the hole. Makiac Sec. 90(a). When black powder or other bulk explosives Qbae. used, the necessary charge or charges shall be

made up at or near the box here the explosive is kept. (b") No open light shall be permitted within 5 feet of any powder box while an explosive is being obtained therefrom and during the process of filling or preparing the charge or cartridges. beopVned°by (c) Kcgs of powdcr shall not be opened by punching punchinga hole a hole in the container either by iron or wood tools, but be opening provided by the manufacturer shall be used for pouring out the powder. Daiiy record se. 91. The Icsscc shall cause to be kept a written aiuisMi daily record of all shots misfired and of mine fires that result from blasting or from any other cause, which shall be kept in the office at or near the mine; and a list of all misfires, giving their location, shall be posted at the main entrance of the nxine before the next succeeding shift.

Wmm OF LBSSBK

ax

Sec. 92. (a) The lessee shall diligently prospect for, develop, and mine the coal in or upon the leased lands; gjaiy pmtshall carry on all mining or stripping operations in good and workmanlike manner, having due rard to the health and safety of min and other employees as specified herein; and shall leave no available coal abandoned which could be recovOTed by the most approved methods of mining when in the regiJar course of mining opar tions the time shall arrive for mining such coal. No worWiiBot entry, level, or panel workings of which tiie pillars have doned save with not been completely extracted shall be permanentlyjjii." abandoned and rendered inaccesable, save with the written approval of the district supervisor or mining

supervisor. . survey and

(b) The lessee, whoever any nunc or any section oi„p mine workmgs therein is to be abandoned or indefinitely closed lifiJ! and before same shall be abandoned or closed, or allowed to become inaccessible, shall cause to be made a survey thereof to show accurately the worked-out areas, and shall extend the results of such survey on tlie map or maps of the undergroimd workings hwembefore required, and shall promptly forward blue prints or reproductions thereof in duphcate to the district mining supervisor.

Sec. 93. Stripping or surface mining pits shall not be permitted in the outcrop of dipping coal beds where the s h aii topography of the surface with iation to the pit will not dxamallow self-drainage or drainage through ditches or adits w tzom from the face of tlie pit to prevent seepage underground then or thereafter, until the workable coal lower in the elevation in that bed and underlying beds shall have been extracted in compUance with the tarns of the regulations and lease.

Sec. 94. (a) Thelesseewheremorethanonebedof coalorebels of is known to exist in the leased lands, shaU not draw or coaie remove the pillar in any lower bed before mining available coaf in each hdown upper bed of such thickness di that it can be mined under the then existing commercial u titaetad. conditions either alone or in combination with the thicker beds, unless it shall be decided by the mining supervisor that the workings or conditions for subsequent nmung ptioM, in any or all of ti upper beds will not be seriously injured by the extraction of flie pillar coal in the lower working-

(b) Where mining operations are in a bed that either below or above another bed m wMch mining las been or is bdng carried <m. and where the vertical distance pnur s m am* thickness dt the lower of the two beds, as far as practicable the lessee shall, if the room and pillar system is employed, so arrange the pillars of room and panel pillars that those in the lower bed shall be vertically beneath those in the upper bed or vice versa; modifications of thisprovision may be necessary in steeply dipping beds. Where the long-wall method is employed and the gave or excavar tion prope ly packed, tms provision is void.

32 &#x27; Operating Regulations For Coal Mines

Where practi- (p) Where practicable, bv reason of either commercial wo'SedT? or mining conditions, the available coal in the upper bells °'*advance of be Worked out before the coal m the lower beds is mined, otherwise the workings in the upper coal bed shall be kept in advance of the workings m each lower bed. limitations of Sec 95. Where the "roora-and-piUar " or any other Sve*d ad'- system of mining is adopted by the lessee which requires Tance workiDSSgjjjpg workings in the solid coal, mcludmg entries, "d-liij"wicrosscuts or break-throughs, and rooms, the lessee shall not without the consent in vriting of the niinmg supervisor

being obtained, extraci by such advance workings or first mining, more than the following percentage of the total area of coal bed within any particular tract of one or more acres to be entered by said advance workings for the specified depths of C(wer, viz, not more than 60 per cent when the cover is less than 500 feet; not more than 60 per cent when a cover is over 500 feet and less than 1,000 feet; not more than 40 per cent when the cover is over 1,000 and less than 1,500 feet; not more than 30 per cent when the cover is over 1,500 and less than 2,000 feet; and not more than 20 per cent when the compntinB cover is over 2,000 feet. In figuring the percentages for term "pwcentadvance extraction or first mining ol the total area ol tne t£*ii-tract under consideration, tlie areas mined and unmined may be compared and figured on the basis of the respective surveyed areas as shown on a map or plan and not on the basis of the calculated tonnages of the workings and bed. The total area of the tract under consideration is to be comprised within fines bounding the faces of advance workings within the respective tract, and, when the dip of the bed is more than 45°, the comparison may be made and percentage figured by means of a projection on a vertical plane or by a projection on the plane ot the bed. In figuring the area of advance extraction or first mining, the area extracted from pillars within the tract under consideration, if pillar drawing is systematically carried on, shall not be included, as it is intended, except where the retention of pillars is necessary for protection of shafts, the maintenance of main roads or passageways, or for the nuarti to be protection of overlving coal beds or important surface J-'US-SS: structures, that all pillars shall be mined and removed as rapidly as proper mining will permit. Notmorethu Sbc. 96. The Icsscc shall not employ more than hve pCV°?Twmen underground on any one shift in any drift, level f/jJf-.M entry, slope, room, or working of any mine, unless such SSSia, ' worimg place shaU be so connected with an adjacent working place, slope, or tunnel as to provide withm a distance of 200 feet of the face of the breast a second tawtioiis, 10 means of egress; except that, with the written approval 2f."SSecof the mming supervisor, not exceeding 10 men on any tion. wiwm ap-shift may be employed to make such second means of egress, provided adequate ventilation is obtained by large rapes or ducts, or by brattices or partitions; but in no case shall my Fooms, entries, tunnels, or braacae

mmm of ubssbl 33

tamed or worked off the single place being driven until

such second means of egress is obtained; except that shaunotwoA

crosscuts may be driven off connection to a parallel passage

as provided in section 18d and stubs for turnouts nMttn.

or switches not over 10 feet long from the side of an entry,

tunnel, or slope may be made.

Sbo. 97. (a) There shall be left in each coal bed being mined, for the support of each shaft, main slope, or shaft egress, a pillar of size proportionate to the depth of the coal bed below the surface and the thickness of coal being excavated in the respective bed. The minimum JftotmdN diameter of the pillar in each bed bemg mmed shall be m general equal to the height of the surface egress above the lowest %tiS point of the pilGar in the respective bed, this ratio being modified by the surrounding natural conditions such as dip of bed, strength of coal, and rock material. Sinulariy each point in a slope shall have the support of a pillar of a width on either side of the center line of the slope equal to one-half of the height of the cover above the respective edge of the pillar. Shaft and slope pillars shall not be less than 100 feet in width.

(b) Shaft and slope landings, sidings, entries for i-aaduigs and haulage, ventilation, manways, ad stables may be At uA excavated in the pillar if timbOTed or lined in a permanent

manner and if the area of such places does not exceed 20 per cent of the area of the pillar, but no rooms or wide working places shall be driven for the above purposes.

(c) 'file pillars specified in the preceding section above may be extracted as the time of eschaiMtion of the minepotan. approaches, or prior to this time if replaced by tiht packing as approved by the mining supervisor in writing.

Sec. 98. The lessee shall not, without the consent of the district mining supervisor first had and obtained, mine any coal, drive any underground working, or drill any lateral bore hole within 50 feet of any of the outside boundary lines of the leased lands, nor within such greater distance of such boundary lines as the district mining supervisor shall prescribe, for the protection of this or adjoining property or the safeguarding of mining operations hereunder from inundation of water or gas; but in the event the coal up to the like barrier on an adjoining leased tract on the public domain shall have been wonted out and exhausted, and the water therein shall have been lowered below the working level of the operations on the same bed on the lands covered by the lease, the lessee shall, upon the written demand of the mining supervisor, mine out and remove all the available coal in such barrier both in the lands covered

Lessee may be

by the lease and on the adjoining premises whenever same can be mined without hardship to lessee, provided, where the coal mining rights in sucV adjoining premises'*" " are not owned by the lessor, an agreement may be made

Operating Regulations Fob Coal Mikes,

by the lessor with the owner of the adjoining coal and

the lessee of the coal, if any. . ,

xTaatte.ded qq The lessee shall not, save as hereinalter

SSr."aS.\u;horized. light, keep, or maintain any fire for heating or unattended open light m any stnpping, except as approved bv the district mining supervisor, or undOTground in any mine, in contact with fl'J*VS, PjL? Zt in or along the outcrop of anv coal bed. Fa,lure to take prompt and vigorous steps for the f of anv sucti fire shall be sufficient ground for the entry of the lessor to remedy said condition. wat ippiy Sec.100. (a) In every mmein wJuchoverlOmenaxeun- Ms'ifSS derground on any one shift there shall be a supply of water ?,erio.n are %Yie surface available for fightmg fires Ma'd a.bout . 1, Grants, and hose, it shall be kei)t in barrels of Sbout 5-0 gallons capacity, painted red, with covers,d a 2-c'allon bucket or can, painted red and marked, Do not ute except for fighting fire," shall be hung or placed Smediatelvadjacenl to ea<-h bel. These barrels aU maintained 'full of water. Bels m a mme where pipe lines and hose have not been stalled shall be principal junction points not exceeding 1,000 feet apt ln main haulage road. Provision shall be made to keep the water iS barrels or pipe bnes from freezing Chemical fire extinguishers having a capacity of not le than 2 gallons maf be substituted for barrels of water xn.t.aon o. (b) In every mine in which over 200 men are emged watersuppiyfor 1 „i.o„nd on anv shift, and in which a sumcient water supply is securable, by moderate expenditure, SSiSS5£" within 1 iile of a mine shaft or slope, the mmmg supg visor mav require, if the conditions at the mine m his [udJmnt make it advisable, the inStaUation of a pump-

2 inches in diameter and extending at least 500 feet on either side of the mam hoisting shaJt or slope to the first forking levels, with suitable attachments for hose not over 100 feet apart and with at least three 50-foot lengths of U-inch hose with standard pif thread connections and nozzles at appropnate points for immediate use. Such pipe lines shall so located and installed that water will not become frozen. reducing valves or equivalent shaU be so placed that the pressure%vill not exceed 50 noun Tn anv

hvdrant or point of attachment of the hose, in any .''°5S?t-oC' ne sud' pipe lines and hose are installed and section 100 will not be reqmred withm the areas reached bv such pipe lines, provided there is an adequate supply of or emergency fire fighting to whic\ the water pipes are connected. "Pipe Imes of a wa Eage system which ie connected with a sump con-

DUTIES VBSBm

tammg over 5,000 gallons of water fulfill the requu-e- ments of water supply and pipe lines imdeiima if provided with taps, vdves, and nose.

Sbo. 101. The lessee shaU arrange, as far as practica- Jtwajr. ot ble manway passages free from regular haulage for the age provided as passage of underground fflnptoyees to aad from their gj." working places. Such manways shall be mamtamed m good order and free from loose coal and rock, and signs with arrowB shall be provided showing direction toward the escapeways on either side of crossmg or intersectmg passages. The lessee shall require the employees to use the manways as far as practicable in going to and from

their working places. , , „

Sec. 102. (a) In any minein which more than 10 men axe sneitM hou. employed underground on any shift, all atries, tunnels, roii4(fc and slopes used both for the travel of men and for haulage shall be provided with shelter holes on one side of the roadway at intervals <rf not exceeding 60 feet; the shelter holes shall be at least 4 feet wide, 4 feet deep, and (j feet high, unless the entry, tunnel, or slope be of less height, when they shall be of the some height and level with the road, ana shall be kept whitewashed and free from d6bris.

(b) Where the clearance between the mme car and nb at such intervals is as much as 4 feet, the shelter hole shall not be required, provided the rib at such intervals is kept whitewashed aad free from debris.

(c) On haulage roadsnot used as travelmg ways, shelter holes will not be required provided there is a clearance between the mine car and the rib of the raitry of at least 3 feet. Shelter holes shall be on the opposite side of the road from the trolley and power wire.

(d) WhOTe there are crosscuts at intervals of not over crosscuts and 75 feet or in entries off which rooms are turned not more than 75 feet apart, the mouths or necks of the crosscuts hoIm.

or the rooms when maintained as above provided, may

serve as shelter holes. .

Sec. 103. (a) At the top of any slope or mcline used for stop blocks or haulage, there shall be an automatic stop block or a slop,, or laspring derail which will stop or derail cars, except when h&d open by an attendant by means of a lever or other appliance while cars are passing under control. „ ,

Tb) Switch levers must be installed to avoid the danger

of men tripping over them. , , i , ,

(c) Frogs and guard rails shall be properly blocked r og a d

(d) When hauhng man on slopes and inclines, saicty e 1 1 y catches, or a special man car giving equivalent result , safety catches shall be installed when practicable; otlu>rwiso when ing men on slopes or mdines, safety hilchmg rope or

chain of ample strength shall be employed, extending

from the rear car to the mam hoisting rope. coinectio.

Sec 104. (a) AllconnecMionswithadjacentmines.il not with adjacent used for hkulage escapeway exits or airways, shall be sealed with stoppmgs which shall be fireproof and W iNiilt to withstand a pressure of 50 pounds per squti;e am cuwk

Operating Regulations For Coal Mines.

inch on either side, calculated by a fortnxila or method approved by the Ignited States Bureau of Standards. mcoiMtc There shall be installed in any open connections

ttoM. substantial iron or concrete fire doors, set in substantial

fireproof frames, which may be closed in an emergency by authorized officials but which may be reopeiied from either side to permit the escape of men who may be trapped behind them m case of fire or explosions. Such doors shall be installed in duplicate, and tne distance between doors shall be at least 40 feet, suckandwf- Sec. 105. (a) The lessee shal I make sucli provisions for the Mdofso as disposal of waste, slack, and refuse of the mine, or waste, piWico?pte' sludje of any washery, that tlie same shall not be a wMnoenuisance or obstruction to anv stream, ri<A\t of way. or other means of transportation or travel, or to any private or public lands, or to any adjoining lands or in any manner to occasion private or public damage or inconvenience. pjtr*?nmar" wastc Containing jM-actically no coal shall be £5uiiMaaii<i deposited separate and apart from coal for which there

is no immediate market, and from the waste containing coal in such proportion that it maybe later separated by washing or other means. Abandoned Sec. 106. The Icsscc shall during the term of the lease Sbr*5SIved!and before abandonment substantially fence, fill in, cover, nuiid la, oTfyj. (lose all surface openings, subsidence holes or workings where peisons or animals are likely to be injured by falling therein, or be endangered hj accumulation of gas. and shall maintain all such fencing or covering in a secure condition during the term of the lease. Bathand Sec. 107. At any mine or Stripping in which more than 25 men are employed on any shift, the lessee shall provide a substantial change house or room convenient to the mine exit or stripping pit, adequate for the number of employees that request the use of same, heated in winter and with lavatory and sanitary bathing arrangements, such as showers or tubs with ample supply of hot and cold water of proper quality, proper drains and sewage disposal, and sanitary lockei's and hangers: Provided, ihnt at mines where it is not possible at reasonable expense to secure ampl(> supply of water, tubs for bathing purposes will suliice, provided eacli employee is furnished at least 5 gallons of water per shift worked until such time as sufficient water can De obtained at a reasonable expenditure. Bwdiinss for Sec. 108. (a) A Icsscc cmploving 25 or morc men in miucs be kepTin stripping operations shall provide adequate quarters tary condition places of abode within 2 miles of the mine unless transportation is available from a town or village. Dwellings built on the leased land shall be properly located with reference to sanitary conditions and an adequate supply of pure water shall be provided in proximitv to each dwellinor.

(b) Facilities shall be provided for the regular collecticm and disposal in a sauitarj maimer of garbage and

DUnBS OF IBSSEK

trash and a separate toilet or privy shall be installed for each dwelling, and at least two in the vicinity of the mme cntxancOa

(c) Unlined pits for privies may only be constructed or thereafter used where and when there are no wells or openings fumishmg water for drinking or domestic use withhi such distance, ot the source of water is in such location that there is any danger of contamination of the water. Where privies unconnected with a sewage system

are used, openings must be screened from flies. , #

(d) It shall be the duty of the lessee to have an mspcction made weekly, by a competent reprntative, of tions i" ii-e toilets, privies, sewage, and garbage-disposal systems on imim.

the lease and promptly to correct or require to be corrected defects and insanitary practices. The recommendations of the United States Public Health Servic as given in their publications shall be foUowed in all such matfi/ers*

Sec. 109. When there is no public school maintained within 2 miles of the village on any lease on which men of mtianm. with children of school age are employed by the lessee, he shall endeavor to secure the establishment of a public school, and until such school is provided by the local or State authorities, he shall provide, if there are more than 10 children to be instructed, a temporary school room or rooms, and shall endeavor to arrange for the employnu lit of a school teacher or school teachers by subscnption

or otherwise. ...

Sec. 1 10. At every working mine or stripping on a lease there shall be provided a Umted States Bureau of Mines standard first-aid box and its equipment, or its equivalent, kept at a convenient place for emergency use.

Sec. 111. On any leased land or mmes in which more „i*,7/Vo o m than 25 men are employed, the lessee shall provide frs;","'!"'";"* emeriency first-aid treatment of injuries near the mam tfc tirf exit of the mine or stripping operation, including a firstaid room or receiving station for injured persons arranted with heating facilities for cold weather, which shafl be equipped with a United States Bureau of Mines standard lii si-aid box or cabinetor equivalent, several pairs of splints, a Bureau of Mines resuscitation apparatus or equivalent with i ts oxygen bottle kept filled ; and there shall always be on hand at least one fully charged oxygen tank, two stretchers or hospital cots, four pairs of dean Dlankets in oilcloth bags, and if pure water is not immediately available, a sealed keg of pure drinking water renewed weekly, a basin, and suitable toilet faolities kept m a

sanitary condition. ,

Sec. 112. (a) The lessee shall also provide for every separate mine in which more than 25 men are employed mw iatt or underground on any shift a refuge and first-aid chamoer" underground either near the foot of one of the shafts, if any, or at whatever point injured persons would most

OPEatATING KEGULATlbNS FOB COAL MINES.

likely be taken to await opportunity to be hoisted or transported to the surface.

In case of a mine on a dipping bed, with one or more landings, this point shall be on the landing which serves the largest group of men. In the case of a drift mine, the location shffll be at a suitable point, such as the junction of the principal branch haulage ways.

Cb) The refuge and first-aid chamber shall bo not loss than 6i feet high, 8 feet wid. in the rloar. and 20 loot long, kept whitewashed and free from dirt, and provided with a tight-fitting door. The first-aid room shaU not be used for other than refuge or first-aid purposes nor entered otherwise except for mspection, repairs, and

First-aid (c) Said chamber shall bc equipped with a first-aid box ""'or cabinet or equivalent, Bureau of Mines resuscitation apparatus or equivalent, with oxygen bottle kept tilled, splints, two stretchers, four pairs, of clean blankets in oilcloth bags, a sealed keg of pure drinking water renewed weekly, a basin, a bucket, portable fire extinguishers „ „ having a total of 10 gallons capacity, a 10-yard roll of TSiSSSclean Wtice cloth, and a keg of nails, and /opy of DUes°"\nd'the latest mine map shall be fastened on a side ot the iwa-chamber. Where practicable the foreman s otlice shall be placed immediately adjacent to the refuge and firstaid room so the latter may be under supervision irt-*id Sec. 113. At every mine or strippinj in which more than 25 men are employed on any shift, the lossoe shall require his mine officials to be trained in first-aid methods when the United States Bureau of Imes can furnish instructors to give such training, and shall provide facilities and encourage the traming of any or all employees

in iirst-aid methods. i v,

KeportiiivM. Sec. 114. A report in writing shall be made of each gdmts to min-accident that results m the loss of more than one shift ti wMTiao . injured person. These reports, giving name, age,

and occupation of miured person, the date, name of mine, and place, with outline sketches or maps when pertinent, the cause, actual work bemg performed when injured, nature or result of injury, and probable length of disability, shall be made promptly to the dLstrict mining supervisor. Where reports embodying the above inf ormation are made to the respective State inspector or mdustrial commission, copies of such reports and outline sketches or maps will fulfill the requirements of this

section. . , i

contagiouV and Sec. 115. AH coutagious discases m or about the lease, occupational as as cases of occupational disease known to tne lessee which result from or are aggravated by the particular work, shall be reported to the diatnct mining

supervisor. ,

Report ins Sec. 116. The lessee shall report promptly to the district mining supervisor by telephone tdegraph the

DUTIES or LESSEE

occurrence in or about the lease of fatal accidents, senous outbursts of <::is. explosions, inundations, extensive squeezes or collapses ot roof, or other serious conditions threatening the loss of life or property.

f.c. 117. At mines in whicli over 200 men are em- Bta.-i... plovod underground on anv shift, the building or """"-gaat coMtruomgs containing the hoisting engine and power plant shall not have floors, ceilings, and side walls or roof constructed of combustible material, but may employ wood for sidewall studs or frames if covered on both sides by noncombustiblo material and may use wood for roof trusses,

purlins, and rafters. , j

Sfc 1 18 In every mine where there are or are designed jtoeptooiUg to bo employed more than 200 men underground on any shift the main hoisting shaft, the ventilation shaft, and the second escape exit, if separate, shall, if the lining orstratum is combustible, bo fireproof ed within six months after completion, bv lining, uniting, or coating with cement or other noncombustiblo material all combustible mammal except guides, huldorwavs, and stanways, and such fireproofing shall be maintained as long as said shafts form the principal moans of ogress. .

Sec. 119. In everv mine whore there are or are designed Pa.owayt to be employed more than 200 men underground on Miyu, to firashift, the roof and walls of entries and passageways within 200 feet of the bottom of each of the two principal meai eo-ross shall, if lined or timbered with wood, have such wood fireproof od by coating with cement or equivalent within one year after said passageways have been driven, and such tiroprooiing shall be maintamed so long as said passageways are ueil. . .

Sec. 120. On any leased land where over 50 men employed, and whore there is no available physician or surR-on whose headquarters is within such distance from the'niine or stripping that the journey can be madennthm one hcnir's time, the lessee shall arrange for mecfacal and surgical attendance for its employees, theu: famihes and dependents, on the lease at designated times.

§EC. 121. (a) On any leased hvnd on which more than 100 men are employed, if there is no State, coimty, my, or aiimtained if private hospital approved by the United States Health Service within 50 miles by radroad or withm 15 miles by woll-maintained private or pubhc highways, and suitable ambulance is available, the lessee shall erect and equip and maintain a hospital at a convenient place on the lease, appropriate in size to the number of men employed and their families, in accordance with the recommendations of the United States Public Health Service;

(b) Provide a suitable covered ambulance, promptly Ambuianc. available fur use on notice when the hospital is over one-to pcoriM. half of a mile from the mine;

(c) Provide for medical and surgical service for tne employees and their fmhes, the employees paymg on

OPEBATING REGULATIONS FOB COAL MIHBa

any prearranged basis satisfactory to a majority of employees the actual cost of such service, but not more; H n r s e s e m - (d) Providc OH the request of a majority of employees, ployed If rejjuj-ges and attendants for surgical and medical treatr "oyee* ment for employees injured in their work, treatment of occupational or miners' diseases known to the lessee, and the treatment of sickness or contagious diseases aflFecting the families or dependants of employees; Hospital and (g) 'fhe nursing, surgical, and medical service shall "icarsfAcefSbe furnished by the lessee to employees at cost, including cMfc"°' salaries, wages, and supplies, but repuirs and renewals of buildings and equipment shall be furnished by the lessee at cost plus an annual charge of not exceeding 10 per cent to cover interest on investment, losses and repairs, and amortization; such chaises may be collected from employees as a condition of their employment fuUy understood and acknowledged: Provided, Hospital serv- (f) That whcu a suitable hospital is erected within 15 byTe'sseVu miles by a good road as stated above, by State, county, fker lerTifttcity, town, or cooperative or private hospital, with naabto. adeciuute accommodations approved by the United States Public Health Service and avwlable for the employees of the lessee, the lessee may be relieved of his obligation to maintain a separate hospital, but shall continue to furnish medical, surgical, and ambulance service at cost on request of the majority of the employees. Mine-rescne Sec. 122. At cvery mine lu wMch moro than 100 persons Mt t'm'in'e are employed underground on any shift, the lessee shall where more kept and maintained at the mine in order, ready for Tmpioyrunusc, in an adequate room provided for the purpose, five sets of oxygen or self-contamed breatiiing apparatus of a kind approved by the United States Bureiiu of Mines, with ample supply of appropriate absorption material and oxygen for at least 10 hours' service of the apparatus, together with the charging pump and repair supplies. Sec. 123. (a) When the number of persons employed nw additional underground on any shift exceeds 200, five additional fhanVoo me'nsets of breathing apparatus with the correspondmg adempioyed nn-jitional supplies shall be kept and maintained. tecKiouui. additional sets of breathing apparatus

Additional sets specified in the preceding subsection will not be required SoopiS'ef-if the lessee cooperates with a neighboring mme or mdus- fMM with an-trial works in the estabUshment of a joint rescue station w*" join?retc2e which sluill be within a distance of one hour's journey station mminvehicle from the mine on the leased land: Provided

, That said joint station is connected bv telephone line and lias an equipment of five sets cd breathmg apparatus of a kind approved by the United States Bureau of Mines, and witn adequate supplies for use m emergency: And further provided, Th&t askid loiat at&tion shall have a hand car or motor car for transporting by rail, if locomoiive is not available, or shall have vehicle equipment for transporting by road, the apparatus and

DUJIES OF XE$BSaEL

supplies to the mine on the leased land within on© hour's time of notice of disaster or threatened disaster.

Sec. 124. The lessee shall arrange, in cooperation with the United States Bureau of Mines, for the training of tcmindd. eipployees in methods of administering first aid to the injured and in the use of mine-rescue breathing apparatus, to the end that there shall be at least one team of five men, who may be mine officials, for every 100 men employed undergroimd on any one shift. A team shall be selected from men who have been certified by the Bureau of Mines as competent in first aid and rescue work, which team shall be trained in wearing appa* ratus in a smoke or gas chamber a total of at least two hoiu in every two months.

Sec. 125. Where more than 300 men are employed where more underground on any shift, a foreman of rescue and first aid shall be employed who shall devote his working time to keeping rescue and first-aid equipment in condition wscue and fint for use and to training men in first-aid and rescue methods: ored. Provided That if a lessee joins with other mine operators or an association in maintaining a central or joint rescue station, as specified in section 123b, within one hour's journey by rail or vehicle, and said station is in charge of a foreman, no foreman of rescue and first aid shall be required at the mine.

Sec. 126. The lessee shall organize a safety conunittee Formation of at each mine or stripping in which more than 25 men are miueerawSiemployed, composed of representatives of the lessor and of the employees, which committee shall hold monthly meetings to discuss and make recommendations relating to safety in the operation of the mine or stripping.

Sbo* 127. (a) The lessee shall accurately woigh or Lessee to keep measure and truly account for the coal mined and loaded Jite weightroi by each miner where the minors are paid either by weight of their output or upon the basis of the measure-and loadea hf ment of the coal; keep a correct record of all coal weighed or measured; post or display such record daily for the inspection of the mines and oth interested persons; and shall,

(b) Require the weighman or person appointed

weigh OP measure the coal where the mmers are paid faithful disupon the basis thereof, before entering upon his duties, to make and subscribe to an oath before some person duly authorized to administer oaths that he will accurately weigh or Qieasure and keep true record of the coal so weighed or measured and credit same to the miner entitled thereto, such affidavit to be kept conspicuously posted at the place of weighing, if any.

(c) Nothing contained here shall be construed to may prevent the lessee, in case bone coal or other impurities of rock. bone, or are loaded by the miner with the coal, from estimating or separately weighing and deducting the amount thereof

0P£BATIK6 EfiGtJIAXlOKS 70B COAL MIHSS.

from the weig-its of coal accredited to thd miner or

miners.

eotr&et will (d) In mines or working places wbm it is difficiilt or

to impossible on account of natural conditions tO cavate wationmade the coal free from rock or other impurities, or in mines byxwMvai o'-here weighing scales have not been installed, nothing herein shall be construed to prevent the lessee from ooitracT on entering into contract with the miner for miners to fudME* Mtomeasiu-e the coal mined and removed by measurement of the excavation thus madt;, or from contracting with the employee to pay on the basis of the feet or yards of advance of the working place.

Sec. 128. The administration of these reflations shall be under the direction of the Bureau of Mmes. Approved, April 30, 1921.

Alb£KT B. Fall,

Secretary.

Index.

ABANDONED mss in mine when not ventilated, stopping required 6

surface openings of holes to be tilled in or fenced 106

ABANDONMENT of mined or unmiued portions, conditions determined by supervisors 6

ADVANCE EXTRACTION Ofcoai 18e

AMBULANCE provided 121b

ANTHRACITJB, definition. 8m Goal.

APPARATUS and machinery inspection, deftx-t remedied before further use 28b

AFPSAL Iroin siperviaor's orders to Secretary of Interior 4,7

B.

BARRIER piUars, boundary W

BATH and change house re'juirements 107

BLACK powder blacdc l>lastmg powder when used shall be fired electrically from surface or by shot

firers 86c

BI#A8TING, black powder, making up charge.

drill hole, depth and other luuitatKms 88

electrical firing from sor&oe 86c

mis Ires, record of 91

open light not permitted within 5 feet when lUling or preparing charge 90b

Sowder box, location of miners' H2

looting in gaseous mine only after safetv lamp test, showing less than 2 per cent hre damp 86b

stemming with n<MioombaBable material 89

storing explosives in powder box 82

BOILER INSPECTION 28a

BORE HOLES to be drilled to relieve gas aflmnnilatlons , fi2b

wiien uiTOoaching sdoandoned workings 5

BOUNDARY barrier jHllars : 75c, d

BUILDINGS of inflammable material not to be placed within 75 feet of any mine, exceptions 17

BUCKETS, shaft sinking 24

a

CHANGE HOUPE and bath requirements 107

COAL, anthracite, definition page 3

Wtuminous, definition page 3

cannel, definition pfB 3

extraction on advance mining 1N5

lignite. page 3

semianthracite, definition page 3

semibituminous, definition - page 3

subbituminous, definitiim - page 3

wasted, ascertaming damages by supervisors 3,4

COAL DUST, analysis of 74e,g

barriers shall be erected in dry districts or panels 74h

cleaning up accumulations oC.- - - 74d

dry method of treatment 74g

mme cars riiall be tit to prevent leakage of dust 74c

prevention of explosion 74a,b,c,d,e,f,g,h

rock or shale dust methods 74g

sampling and analysis of . "g

screiiing and loading of.

end cars employed when practicable 74c

watering methods 74e,f

CONNECTIONS with adjacent mine 104a

CONSTRUCTION, engine house and power plant 117

CONTRACT with miners to measure coal in lieu of weighing 127d

CROSSCUT, break-throushs, definition of page 4

break-throughs, distance between 18b

Crossheads. 24

D,

DANGEROUS CONDITIONS, calling for withdrawal of workmen 45

recorded by fire boss or examiner 51a

Definitions 3,4

DEPTH of coal bed, limiting amount of coal removed by advance workings : 95

DEPUTY mining supervisor, definition PBB

DERAILS or stop blocks on top of slope or incline 103a

DETONATORS, or blasting caps containers for. requirement. j£ 83

caps. Sec Explosives.

DEVELOPMENT from adjoining mine 75a. b

flfmines "5a

DISASTSBS-miistbepraDiptlrnporM

44 oPSRAxmo KsGmjkTioirs poe ooal itonts.

Saetkais.

DISEASES, contagious and occopaftiimal reported

DISTRICT mining supervisor, defloitioii. i?uk

DOORS incoanectionstoadioiniiMrniina.

DRIFT, deOnitions P®

DRILL HOLES, limitations of

DRILLING HOLES in advance when apiffoaching abandoned workings

DUST. 9e Goal dust. - -

DUTIES of district, deputy, and mining supervisors JJJ

DWELLINQS of employees to be kept in sanitary condition

ELECTRICITY classiflcation by voltage

competent man in charge to be appointed by lessee

cmrent cut off when 2 per cent gas praWt -5*

current cut out of unused district v—itu- StS

electrical installations to be installed to Insure greater samy

high-voltage Installation requirements - - - - Jj

installations in aocMance with Bureau of Mines recommendations w

lighting in gaseous mine used oftly onintake. .- H

lights on locomotives and cars

limitations of voltage undergouAd 2

machinery voltage . . . *£r

mining machinery electrically driven shailnot bo used in iseous BdncB unless explosion proof., asa

pulling machinery stopped if 2 per Oiint gas piwent. kki K a

legulationslSDrinstaUatioD 65a,b,c

shot firing finom surboe.

signal wires limited to 30 volts -J*

stations underground

supports of electric wires and cables

switches in all circuits at regular intervals

switches in gaseous mines must be approved

switches placed accessible to working place - ... — -- "j*

tests for gas frequently made in gaseous mine where electncity used

transportation in electrically equipped mines - - - : VZAi" V Mt

trolley and nonpermissible storage-battery locomotives used m gaseous nunes under UmltatlaDS. W

trolley-line voltogetrolley

wire plaoemwit and guards aio'k

undergroimd electrical stations - oia,i>,is,a

voltage classifications ?2

voltage of trolley line and other machinery

irarning signals far voltage

BJIBRGENCY suppUes for fires and exploRicns

ENGINE house and power plant construction ™tra 1

ENTRY or level, definitions Pff

ESCAPE WAYS, second exit or means of egress ,UoL' i

ETHANE, definitian - :: v :: v ii t?

EXITS to surface, second exit, or escape way to be provided, distance apart "

EXPLOSIONS reported by lessee

report to mining supervisor

EXPLOSIVES, amount miners may havein mme-black

powder shall be fiied eleetrioally from surttoe or by shot ikiers sc

character of drill holes S

character of powder box

containers for individual miners, nonconductmg

detonators or blasting caps not stored in containers for ex|UOaveB

distribution to miners by authorised pmms

kegs shall not be opened except by opening provided

magazines.

magazines, detonators stored. - - ii

magazines on surface. ii

magazines underground

making up charge with black powder -

men may carry into mine only in nonconductmg containers

mine car for same

miners' supply kept in powder Ijox. , '5

nonpermisslble, Gonditfoos of ose

permissible, required in gaseous mine

powder box, location q.

records of misfires

avit into mine, distributed promptly - . - - -

shots shall be nred in gaseous mine only after safety lamp tests. oo

diots shall be stenuned withn<mcombustible material g:

tempomry storage tmdergroond - fj

thawing "

transportation in electrically equipped minos

transportation in mine where electricity used as source of power

underground transportation in bulk r

£XTItACTXOM OF COAL by advanced workings

F.

FAN, adjoining mine, lifee of fan

booster Ian in nongaseous mine *aL

booster Im, recirculation of air limited "

Index. 45

FAN, nudnfan, in gaseous mine

not to be placed in direct line with mam entrance.

temporary fen may be installed.

ventilating main fan

FIRE BOSS, mine examiner, dnUes of.

mine examiners, appointment of, qualifications

mine examiner to be appointed tor every 75 mesi employed underground

report reoOTd copied and sl0Md J

FIRETDAMP, definitions Pa*?©

removal of -V

FIKE DOOR in mine connections JJo

FIHE FIGHTING, pipe line and hose Jjo

supplies underground "5

fire or unattended open lights forbidden

water supply installation 'TfJ

FIRK PROOFING, shafts

passages adjacent to exits. :

FIRST-AID box for suppUes y,

chamber in mine nite

receivini: room near mine or stripping. -

training encouraged - J J'

FOREHAN of lesoue and first aid where moce tbaa 900 men employed underground ip

mine ftwemaa, qnalllUmtlffliw

a

GAS, definitions mk

accumulations, bore holes to drain saiqe

oil wells, methods of protection from, approved by supervisors

oil wells, precautions in approaching

GASEOUS mine or district, determination of. - -- limine or district, only permissible txfpkKAvm shall be used

mine or district to be guarded jf

GASOLINE, engine exhaust of, piped to surface '

transportation underground.. - i}:?

GUARDS for medium voltage

Ouipss

H.

HAULAGE, blocks or guardrails properly blocked

road clearance

road, shelter holes -

safety catches for safety man car on slopes

switch-lever arrangement

storage of LS

qnantitv that may bestoced ifr

Headframe

HOISTING, code of signals for g

operating cage or skip prior to lowering men g

signal wire voltage „

signalling, two methods required - : —

HOISTIN G IeQUIPMEN T, and mechanical equipmeut, daily exanunaliiju ot

28a

breaks of engine

cage rests or chairs

cages for hoisting men fS.

j' — — — *oD

defects remedied before farther use.

20d

drumflanges.

electric hofet, automatic stopping -

general character of - - i':"i.V"l.'"CZ. SS

hoisting clearam o, /versvinding. and overspeeding devices or detaching nooKS

hoisting rope, attiv, hmonts to cage, sockets, dan

hoisting ropes, fastening to drum or reel

hoisting rope, dressing of

hoisting rnpes,inspecaon of

hoisting ropes, record kept fSi

landing gates 21b

safety catches on cages Ji"

safety factor, hoisting ropes SJJ

self-dumping cages, nonoverturnmg

shaft or landing gate - - -

shaft sinking, safety hooks, and erossbeads.- fj

signaling, two methods required 1- ;

HOISTING ROPES, attadiments of to cage, sockets, damps

dressing of

Inspection of

record kept

saf et V factor of |J5

when todiscard - vk*;' VV la

HOISTS required at both shafts when over 300 feet deep

stairways, ladders, required, for egress "

HOSPITAL esteblished - - - - - Yif

service discontinued by lessee if oier service available.

surgical and medical service funiiahedaniployeiBteo8t-

Oferatinq Be617Latioxs Fob Coal Minbs.

Tections.

INCLINED shaft, definition 1 page 3

INSPECTION and supervision bv supervisor i

INSTAiaATION of water supply lor fire fltlDg. 100b

J.

JOINT RBSCT7E STATION Ifflb

LADDERS, hoists, and stairways required for egress 12

L AD DER WA Y in shafts over 300 feet deep H

LEASED LANDS, definitions PJigO 3

LEASE TERMS, relating to mining operations in section 4a ctf lease form. General Laud Ofluce

Circular 679, lessee shall observe orders super ylsocB- 7

LESSEE, definitions PS© 3

LIGHTING, electric, in gaseous mine only onintakes W

lights on locomolives and cars required 63

lights on top and underground landings 25

open lights in mines and strippings prohibited 99

open lights not permitted in gaseous mine — 38d

LIGNITE, definition. See Coal.

LIMITATIONS of coal to he removed to advance workingsiii room andlwJiarsystaii 95

of number of men employed until second means of egress provided 96

LOCOMOTIVES or other internal combustion engiiMSy UmltaUoa 71a

LUBBICATING OIL, amount pormittedin mine: 73a

MACHINERY in and about mines shall have appropriate lards for moving parts 2ft

MAIN entries and airwavs over 4.000 feet from nearest shaft or egresSy iniiiimnm number required.. 19

MAN WAYS not used for haulage provided as far as practicable 101

MAPS, blue prints or reproductions furnidiad annually 9c, f

blue prints or reproductions required 8, 9a, b, c, d, e, f

development of mines in accordance with preliminary plan 10

of blue prints to show stoppings, water accumulation, direction of ventiUngAnmnts 9c

of buildiiugsand bore holes to be shown - Ob

preUminary plan to be submitted In advance of operations lo

profiles, steep-dipping beds 9d

survey for, before workings abandoned 92b

vertical view, mine workings dipping over 45* , 9e

worked-out areas shown 9a

MEASURING COAL by excavation in lieu of weighing 127d

MECHANICAL EQUIPMENT, daily examination of 28a

MEDICAL AND SURGICAL services 120

METHANE, definitions - page 4

MIN E , boundary pillars - - 75c

minestdeflnitions page 3

MINE AIR, quality determined by analyses 38a

MINE BOSS. 5f€ Mine foreman.

MINE DEVELOPMENT, conditions<tfdevelo!>insfroaiadjolnlngmine 75a

connections with adjacent mines 75a

MINE CONNCTION, fire doors 104b

MINE EXAMINER or fire boss, fencing and marking off of dangerous places 44

MINE FOREMAN, a!)pointnient or, ouaUfications, duties 41a

assistant, appointment of. qualificatioiis. 42

MINE MANAGER. See Mine foreman.

MINE BESGUE AFPARATTTS, 5 sets required fSor mine employing more than 100 men underground 122

additonal sets for mine employing more than 200 men undomroond 123a

additional sets not required if j(<int rescue station maintained 123b

fweman where more than 300 men employed underground 125

oxygen - 122

teamloniMd and trained m

N.

NEW WORKINGS limited until second means of egress provided 96

NUMBER OF MEN to be employed 96

NUBS£S employed if requested by employees at their cost 121d

O.

OIL and gas wells, precautions in approaching 70

lubricaUng, amount permitted in mine 73a

lubricating, storage of 73b

OPEN LIGHTS unattended prohibited in mines or stripping 99

ORDERS not in conflict with respective State laws 4

OUTCROP COAL on dipping bois Shall not be stripped unlfiss natural drainage. 93

02YQEN breathing apparatus. 12% 123a, b

P.

PANEL, definitions page 4

PASSAGEWAYS adjacent to exits to be Oreproofed 110

around shafts 15

PflBMISfilBLB, dafinitlona paga 4

Sections.

PILLARS, between entries and parallel room, minimum thickness 18c

boundary barrier 75c

extraction of chain pillars and room stumps ISe

minimum thickness between intake and return airway I8a

not to be drawn under workable bed except under certain enndittoiui : Ma

removed in panels as rapidly asj)ossible 05

support of shafts, slopes, and drifts 97a

vertical arrangement, when under or over pillars in another bed 04b

PIPE UNB and nose in mine lor fire protection 100b

POTENTIAL and VOI/TAOS. dsftntthna. 4

R.

REFUGE AND FIRST-AID CHAMBER, equipment recommended 112c

REPORTING accidents 114

condition of machinery and apparatus 28a

dangerous gaseous condition 51a, b

explosions to minii'.j: upcrx isor 114

occurrences of contagious diseases 115

threatening dangers m mine 116

ventilatinepressure recording water gauge 40

REPORTS OF INSPECTION of supervisor to Secretary of Interior 2

records of hoisting ropes ; t7f

RESCUE TEAMH formed and trained tU

ROCK OR SUALE DLST BARRIERS, definition pMB 4

BOCK OR SHALE DUSTING, definition page 4

ROOM, CHAMBER, definition page 4

EQOlf N£CK mtnimum width and tongtiu IM

SAFETY catches on cage;? 21b

catches or .afcty man car on slopes 103d

committee foriuation of, recommended 126

man car, safety catches on slopes 103d

SANITATION, dwelliugs of employees shall be kept in sanitary condition : lUte

on lease 108b, c, d

SCHOOL facilities for children of employees 109

SEALING OFF abandoned areas SSa

SHAFT, definition page 3

exits, distance at>art U

fireproof ed IIS

inclined and vertical, definitions page 3

pillar, slope pillar, drift pillar 97a

pillar, slope pillar, drift plUar, removal of 97b

protection of openings 23a

SHELTER HOLES on haulage roads lOaa

SHOTS, shooting, shot firing Ste Blasting.

SIGNALS for hoisUug 30

for hoisting, two methods required.. 81

SIGNAL WIRE Umited to 30 volts 00

SLACK, refuge and sludge, disposal of, studl not be a nuisance 105a

SLOPE, definition page 3

sump or hole shall be fenced or guarded 23a

STAIRS, platforms and dangerous walks provided with rails And gles 2B

STAIRWAYS, hoists and ladders required for egress 12

STATE LAWS in reference to orders of supervisors 4

STOP BLOCICS, or derails at top of slopes or indies lOBa

STOPPINGS of abandoned areas not ventilated. fi2a

in crosscuts and break thruughs £3

in connections to adjoining mines lOla

STRIPPING OPERATION, definition page 3

of outcrop coal forbidden unless drainage provided 98

SUBSIDENCE holes to be covered, tilled in, or fenced 105

SUPPORTS of roof and sides of traveling roads 16

SUPERINTENDENT may be lessee if qualified 40b

may serve as foreman when less than 2b men underground ttb

shall be appointed, quaUfications 40a

SUPERVISOR, inspection and supervision by 1

SURGEON employed ISM;

SUKolCAL and medical servioa. 120

SURVEY and maps, extensUm of each six oumths 8

SWITCH lovararraiieniMit. 108b

TELEPHONES In and about mines 33

TIMBER and other supplies furnished miners as needed 78

TIMBERING of uaveliiig roads and woriung places 16

TUNNEL, inclined and horisotal---, pas* 4

UNMARKETABLE coal disposed of separately from waste 105b

UPPER beds to be worked first or in advance where practicable 94c

OPERATING BEGUIATION& FOR COAL. MIUfBS.

VENTILATION, entrance to gaaeoas mine or distrlet to be guarded 39

fan 33a, 34, 36

fan shail not be stopped or reversed unless authorii oflldals in qbk*

gaseous mine or district, determination of o4'

gaseous mine or district, open lights not permitted 38a

mteRopted, no man can enter mine untfl aatboriced

measurements of, records - - g

minimum quantity of current per man

not more than 75 men on one spUt

pressure-recording instniments

quaUty (rf mine air determined by analyses — . i

stoppings, character of

stoppings of worked-out or abandoned areas

W.

WASTE from mine and washery JWa

WATER barrels for fire fighting Ja

WEIGHING or measurement of coal minecl for payment of minm i'a

WEIQHMAN to take oath of oflloe. V2r

WEIGHT deduction for rocfc bope, or clay loaded with coal v VoV k h . f

WELFARE OF EMPLOYEES 108a,b,c,d,109,120,121 a,b,0,d,e.f

WITHDRAWAL of workmen for dangerous conditions of gas or roof 45

WORKINGS not to be abandoned save with written approval 92a

in solid coalin room and pillar sivtem limited by depth from surface. 95

WOmmtQ PI#ACfi,defisitioa. -

y.

YARPAQE asmeansoCmcasurinseoalmined

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