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)
District mining supervisor. — An agent appointed by the Secretary of the Interior to supervise coal-mining operations in one or more of ,J> the coal fields
Public-domain full text preserved in the Mountain Man Mining Library. Original source: archive.org.
This is a digital copy of a book that was preserved for generations on Hbrary shelves before it was carefully scanned by Google as part of a project
to make the world's books discoverable online.
It has survived long enough for the copyright to expire and the book to enter the public domain. A public domain book is one that was never subject
to copyright or whose legal copyright term has expired. Whether a book is in the public domain may vary country to country. Public domain books
are our gateways to the past, representing a wealth of history, culture and knowledge that's often difficult to discover.
Marks, notations and other maiginalia present in the original volume will appear in this file - a reminder of this book's long journey from the
publisher to a library and finally to you.
Usage guidelines
Google is proud to partner with libraries to digitize public domain materials and make them widely accessible. Public domain books belong to the public and we are merely their custodians. Nevertheless, this work is expensive, so in order to keep providing this resource, we liave taken steps to prevent abuse by commercial parties, including placing technical restrictions on automated querying. We also ask that you:
+ Make non-commercial use of the files We designed Google Book Search for use by individuals, and we request that you use these files for personal, non-commercial purposes.
+ Refrain fivm automated querying Do not send automated queries of any sort to Google's system: If you are conducting research on machine translation, optical character recognition or other areas where access to a large amount of text is helpful, please contact us. We encourage the use of public domain materials for these purposes and may be able to help.
+ Maintain attributionTht GoogXt "watermark" you see on each file is essential for informing people about this project and helping them find additional materials through Google Book Search. Please do not remove it.
+ Keep it legal Whatever your use, remember that you are responsible for ensuring that what you are doing is legal. Do not assume that just because we believe a book is in the public domain for users in the United States, that the work is also in the public domain for users in other countries. Whether a book is still in copyright varies from country to country, and we can't offer guidance on whether any specific use of any specific book is allowed. Please do not assume that a book's appearance in Google Book Search means it can be used in any manner anywhere in the world. Copyright infringement liabili can be quite severe.
About Google Book Search
Google's mission is to organize the world's information and to make it universally accessible and useful. Google Book Search helps readers discover the world's books while helping authors and publishers reach new audiences. You can search through the full text of this book on the web
at |http : //books . google . com/|
Sep 3 1921
Department Of The Interior
ALBERT B. PALL, Sscrstary
- /l3 14. % BUREAU OF MINES
' H. FOSTER BAIN, DnmcTOR
Operating Regulations
To Govern Coal-Mining Methods And The
Safety And Welfare Of Miners
On Leased Lands On The
Public Domain
UNDER THE ka OF FEBRUARY 25. 1920 (PUBUC No. 146)
Washington Government Printing Office
Contents.
Page.
Definitions 3
Powers and duties of mining supervlBor, district mining supervisor, and deputy
mining supervisor 6
Duties of lessee 6
Index 43
The Bureau of Mines, in carrying out one of the provisions of its organic act — to disseminate information concerning investigations made — sprints a limited free edition of each of its publications.
When this edition is exhausted, copies may be obtained at cost price only through the Superintendent of Documents, Government Printing OflBce, Washington, D. C.
The Superintendent of Documents is not an official of the Bureau of Mines. His is an entirely separate ofice, and he should be addressed:
Sufebintbndbnt Of Documents,
Government Printing Office
Washington, D. C.
The general law under which publications are distributed prohibits the giving of more than one copy of a publication to one person. The price of this publication is 6 cents.
First edition, May, 1921.
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 Congress approved February 25, 1920. (Public No. 146— 66th
Congress.)
Definitions.
The following expressions wherever used in these regulations shall have the meanmg now designated, viz :
Mining supervisor. — The agent appointed by and acting for the Secretary of the Interior to supervise all 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 ,J> the coal fields of the United States, acting under the direction of the mining supervisor.
Deputy mining supervisor. — An agent appointed by the Secretary of the Interior to supervise specific coal-mining operations, acting under the direction of the mining supervisor or district mining supervisor, vc Lessee. — Any person or persons, partnership, association, firm, corporation, municipality, or State 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 accordance with t the act of February 25, 1920, for the purpose of mining coal therefrom. V Coal. — The term *'coal" shall include lignite, subbituminous, can- cC* nel, 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 under-
f round, that contribute directly or indirectly to the mining or hauling of coal. Said excavation may be in one or several beds of coal, provided the hoisting or haulage is through an opening or openings to the surface used in common.
Stripping operation. — The term ''stripping" or "stripping operation " shall mean a mining excavation or development by means of a surface pit or quarry, in which the surface or cover over the coal bed is first removea 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 inclined entry in a dipping coal bed or an inclined tunnel to a coal bed, the average inclination 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 underground shaft between two or more levels.
Inclined shaft. — The term " mclined shaft" shall mean a shaft which is inclined from the horizontal more than 45°.
Drift. — The term "drift" shaU mean a horizontal passageway, level, or gangway, driven from the surface outcrop in the coal bed.
4 Opekating Regulations For Coal Mines.
Tunnel. — 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.
Boom. — The term ''room" shaU mean a wide working place turned off an entry, slope, or level.
Working place. — The term ''working place" shall mean a room, breast, entry, pillar, or place where cojJ is being mined or extracted and where one or more miners per working shift of the mine are regularly 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 large rectangles or panels isolated or surrounded by solid pillars of coal into -vmich pairs of entries are driven for the development of rooms and the extraction of pillars.
Entry. — The term "entry" shall mean a passageway in 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 mown as "levels" or "gangways," and to the dip are known as "slopes."
Crosscut. — The term "crosscut" shall mean a passage driven to connect adjacent parallel entries or rooms. The term is synonymous with "cut- through"; and between rooms, where driven wide, is synonymous with "break-through."
Rock dusting. — The term "rock dusting," "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, check, control, or extinguish coal-dust explosions as described in the publications of the United States Bureau of Mines on coal-dust explosions
Rock-dust barriers. — The term "rock-dust barrier" shall mean a large quantity of dry rock dust placed on such mechanically operated shelves or containers of design 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 miners to mean "fire damp," or an inflammable or explosive gas, chiefly methane, sometimes, as in case of leakage of natural gas, accompanied by ethane. When mixed in certain proportions with air the mixture is explosive. (See Methane.)
Fire damp. — The term "fire damp" in these regulations is used in 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 (CHJ frequently encountered in coal mines; it is inflammable 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 (CzHg) found with other lighter hydrocarbon gases in natural gas in conjunction with methane.
Permissible. — The term "permissible" as appUed in these regulations in connection with explosives, safety lamps, electric machinery, rescue apparatus, and other devices shall mean materials, apparatus, and devices ofliciaUy listed by the Bureau of Mines under a schedule of tests and approved as having met its requirements for the respective specified uses.
Potential and voltage. — These shall be taken as synonymous terms to mean electrical pressure as determined by a voltmeter.
POWEBS AND DUTIES OF Hlimra STTPEBVISOB, DIS-
TBicT Hurnra supebvisob, avd deptjtt miitnra supebvisob.
It shall be the duty of the mining supervisor, district mining supervisor, and deputy mining supervisor:
Sec. 1. To visit from time to time leased lands vhere intpeotipn coal-mmmg operations are bemg conducted, and to m-by mpwrisor. spect and supervise such operations and plants connected tnerewith 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 other property and to equipment, and in order to supervise matters pertaining to the welfare of the miners in accordance with the provisions of these regulations.
Sec. 2. To make reports to the Secretary of the Inte- JJJgJJ®'- rior as to the condition of the leased property and the secretary of inmanner in which the operations are being conducted and his orders are being complied with, 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 the lease and these regulations.
Sec. 3. To ascertain and report the nature and amount Aioertain of damages, if any, to the leased premises or to adjacentJeJfJ? coSi property belonging to the Government, to report the amount and value of any coal avoidably lost or wasted, and to make recommendations on the action to be taken to the Secretary of the Interior.
Sec. 4. The mining supervisor, the district mining iiAuaneeoforsupervisor, and the deputy mining supervisor majr issue flfc?55th*reSusuch orders and notices in writing as may be appropriate to °' ® secure compliance with these regulations, and may order ' the discontinuance or modification of any operation or method that is causing or likely to cause any endangerment of life or property or is in violation of the provisions of the lease or regulations: Provided j That such orders are not in conflict vrith the laws of the State in which the leased land is situated: And jurther provided, 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, pending 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 JjfpeSri ''JJ! danger of loss of life or loss of the mine is involved, the den to secredeputy or district supervisors' orders are subject to review by the -mining supervisor, and his in turn on further appeal are subject to final review by the Secretary of the Interior,
6 Opebating Regulations For Coal Mines.
Preicribe or Seo. 5. To prescribe or approve the methods of protec-
oSs'or* pSoteo- tion from oil and gas wells through the coal measures and
and mufweiia! both with rcspect to prevention of leakage of oil
' or gas endangering the lives of employees, and also to
prescribe or approve methods of obtaining the ultimate
extraction, so far as possible, of coal in the vicinity of
oil or gas wells.
oonditioMfor Seo. 6. To Specify in writing under what conditions a
!£Sd oro?i2-mine, or panel, or other section of a mine from which the
mine!*'" coal has not been extracted may be abandoned by the
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.
Lesiee shau Sec. 7. The lessee shall observe and carry out the of "supervisors terms of the act of February 25, 1920, and of his lease Si+h*!*' i/l/lf* and the orders and written notices of the mining super-
tions and terms visor, district mining supcrvisor, and deputy mining to coiiflic?*iSth supervisor, which are in accordance with the regulations state uws. terms of the lease and which are not in connect with
the laws of the State in which the leased land is situated:
Providedj That when the order and notice does not
require immediate action for the protection of life or
Appeal from pro])erty, an appeal may be taken successively from the
pSriorstosSc- rder of the deputy mining supervisor to the district
retary of lute- mining Supervisor, to the mining supervisor, and to the
Secretary of the Interior for final decision as provided
in section 4 of these regulations. Extension of Sec. 8. Accurate surveys shall be made at least every Si3rJi?mont£" six months, and the mine-office maps of each coal bed
shall be extended to show the amount of advancement of all the mine workings and all other changes of a permanent character that have taken place during the six months preceding the survey, worked-out Sec. 9. (a) There shall be shown on the map of the re- Sfo'onmap! spcctivc coal bed, in addition to the information specified *in the lease, the location of all pillars or parts of pillars extracted and the territory abandoned in which the pillars have not been completely recovered, snrface bnud- (b) There shall be shown in outline on the surface map foies'tobe the locatiou of all structures or buildings and the locaihown on map. t,ion at the surf acc of each prospect bore hole appropriately numbered, and legends on the map or margin thereof shall show the elevation of the surface at that point, the elevation and thickness of each coal bed penetrated, the elevation of the bottom of the hole, and any other important information concerning same, including the angle and direction of drilling where not vertical. Blue prints of (c) The Icsscc shall show on Sie blue print or reprofurnished annually to the representatives of the fire pipe fines, permanent ventilating stoppings, doors,
Duties Of Le5Ssb. 7
overcasts, 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; and fire areas, Known bodies of standing water eitner in or above the workings of the mine, areas containing inflammable gas, and areas that have squeezed, pofni
(d) Where the coal bed or beds dip steeper than 45, steep-dippisf profiles or vertical cross sections parallel with the ap- iiS:. 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, with appropriately marked reference points.
(e) Where the average dip of a coal bed being worked vrtici tiew is more than 45®, a vertical view shall be prepared on theS'edfppluf same scale as the general mine map, which will represent®'
the mine workings in that bed on a vertical plane parallel with the average strike of the bed or beds, and which wiU have appropriately marked refer:ence 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 mining supervisor.
Sec. 10. After necessary prospecting has been done on preiimiKary any lease and before permanent operating shafts, slopes, fj rabSSSS dnfts, or timnels have been made, the lessee shall prepare of a preliminary plan together with vertical sections to indi-co*m7?QTa* cate so far as Known the positions, dip, and thickness of 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 outline the principal prospect and proposed entries, airways, shafts, and structures, including fan or fans, with an outline plan and description of the proposed method of unaeioimd development and ventilation, which plan and descrip- Defeiopment tion shall be submitted to the district mining super- 'o'clor daVoe 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 the district mining supervisor.
Sec. 11. In every separate mine in which more than 10 second eiit to men are employed underground on any shift, the lessee JSJVed wiA shall provide in addition to the main shaft, slope, or drift, Sen 'empKyed an escape way or second means of eeress to tne surface, on a ihift. 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 vertical shaft or by inclined shaft, the exits shall be not less than 200 feet apart. An escape way or ontiat through outlet through an adjoining mine which has adequate adjoimnf min. faciUties for escape will be regarded as a satisfactory
8 Oubrating Regulations Fob Coal Mines.
compliance with this reauirement if at all times available
and Kept in proper condition for use. If such adjoining
mine snail be abandoned at any time or shall cease to
operate indefinitely, the lessee hereunder shall be solely
responsible for the cost and expense of maintaining such
outlet; and if such outlet shall be abandoned or permitted
to become unsafe for use, not more than 10 men shall be
employed underground in the mine on any one shift until
a second exit or escape way is obtained and made safe for
use: Provided That where men have been entombed by
an accident, this regulation will be suspended, for the
purpose of carrying on rescue work.
it?airway' aid Sec. 12. In any shaft mine in which more than 10 men
dd"adare employed unaerffround on any shift, unless there is
ihitin* which means of escape bv Siiit, tunnel, or slope, one shaft must
men* i2e**em?b® equipped with hoist and cage suitable for hoisting or
ployed. lowering men as specified 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 landings at each turn.
when over 800 employed underground on any shift, if the escape shaft is more YanYoo more than 300 feet in depth vertically, it shall be proground. system for hoisting men, and a qualified and experienced
hoist man shall be available, on appropriate signal from underground of fire, explosion, mimdation, or other emergency, to proceed to the hoist and act as hoist man. The hoisting equipment and cages in each of the two shafts — main shaft and escape shaft — shall have sufficient capacitv independently of one another to hoist out of the mme all persons on any shift in 30 minutes, with due regard to safety in emergency hoisting. ladderwVy* J Seo. 14. In shaft mines over 300 feet in depth in which feet *°®over 100 men are employed imderground on any shift
either in the main or escape shaft, there shall be an emergency ladderway with landings every 20 feet vertically apart and not exceeding 80° pitch. A stairway as described in Sec. 12 may be substituted for the ladderway. around*ilaxti' Sec. 15. At cach landing of a shaft there shall be made
and kept free of obstruction a passageway at least 6 feet highv and 4 feet wide that will enable persons to pass from one side to the other side of the shaft without passing through any compartment of the shaft: Promded, A compartment of a shaft may be used for a passageway if same is not used for hoisting, when properly floored and roofed over by bulkhead sumcientlv strong to protect men passing underneath from heavy lallinc bodies. ®! Sec. 16. The roof and sides of every traveling road and
roof and tides of ,. i i.ni_ j
traveling roads. Working piacc shall DC made secure by timbering or
adequate lining and arching, and, a person shall not, unless appointed for the purpose of exploring or repairing,
Duties Of Lessee. 9
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 Nobudin|oi the iurface any structure of inflammable material within ltriai™to hi 75 feet of any opening; nor permit an inflammable structure to be connected to anj of the noninflammable any buao. buildings that are within this distance except as follows:
(a) An open timber framework or head frame of timber Kxoeptioiif. may be constructed over a shaft, slope, drift, or tunnel.
The posts and rafters of any such structure may be of woodif the covering or lining is made of noninflammable material, but imder no circumstances shall wood flooring be used, except in tipple and trestle structures.
(b) Inflanmiable material shall not be stored or placed within 75 feet of any mine opening, except while sendmg down mto or removing such material from the mine, and except for a day's supply of oil for lubricating machinerv in the respective structures.
Sec. 18. (a) The lessee shall separate intake and Mint mum return airways and any adjacent parallel entries where the coal bed is more than 5 feet in thickness by not less Swm 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 nnunoe bebetween parallel entries or rooms shall be in accordance oTb ??"*k*!
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 mming 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 circuit of air or a second means of egress.
(c) The piUar between any entry and a parallel room puur between or panel working shall be not less than 50 feet in thick- f'jnr and parai-
y ®i , .,..,., lei room not leu
ness, ana as much more as may be required in the judg-than m feet in ment of the mining supervisor. thicknen.
(d) Room necks shall not be wider than ft feet for a Roomneck distance not less than 18 feet in length, unless the lessee
IS given permission m wntmg by the mining supervisor to make the room necks wider and shorter than above specified.
(e) The coal in chain pillars and room stumps and„,5?J*f.** !5HJ
It 1 .ii *ii 1 1 1 puian uia room
panel boundary pillars provided under sections b, c, and itomps. d shall be left standing until in the proper course of
38401*—21 2
10 Operating Regulations For Coal Mines.
mining operations the time shall arrive for their removal, following or durinjg the extraction of the room pillars in the adjacent workings: Pravidedy That where the advancing long-wall method is used all coal may be excavated, in which case pack walls of appropriate thickness shall be built and tne space between tne intake and return airways shall be tightly packed with* ro or sand.
©▼r 4,000 fMt requires for its extraction main levels or entryways for
" iiiaft ventilation and escapeways more than 4,000 feet in
length beyond the nearest air shaft or place of egress,
m 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:
Jills? **-Prowdtf(i, That where only two levels or entries are
driven prior to entering such section or area, entry
Sillars shall be left of sufficient width to permit the riving of the necessary additional passageways to the area. Separat)d pairs of parallel entries entering the area in question and properly maintained will fulfiTl the foregoing respective requirements: And further provided j 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: Ana 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 requirements may be waived with the approval of the Secretary of the Interior.
H o 1 1 1 1 B K Sec. 20. (a) All hoisting equipment used in shafts and itAndard ohax- slopes shall be of ample capacity, and the design of a after. commercially recognized safe standard character, and in
accordance with the respective State requirements.
Dram flaiifei. (b) The drums or caole 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 the drum or reel.
Hoist brakes. (c) All hoists shall be equipped with brakes sufficient 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 imbalanced cage or skip.
Bisotrio hoist, (d) All electric hoists shall be equipped with protective JJJg." ' devices which will immediately bring the hoist to rest
upon failure of power and will permit the lowering of the cage bv brakes after it has been brought to rest tnrough the f fdlure of power.
Duties Of Lessee. H
(e) In shafts and slopes where men are hoisted or ered, 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 whicl over 200 men are employed undergroimd on any shift there shall also be over- aiJoJerspeed? winding and overspeeding devices connected with thenar devices or dehoist, or equivalent devices approved by the mining super- ® k oo visor shall DC installed and mamtained to prevent the cage from being overwound or from falling if overwound, and from overspeeding considering the character of the 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 men 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, ratei, ing or lowering men shall have gates or doors at least 5 and handholds feet high, closing the entrances to the cage on each deck hoistSlf men. "' 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) Cases, when hoisting or lowering men, shall be pro- safety catches vided with safety catches, capable of bringing to a stop
the fully loaded cage within a distance of 10 feet 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 jj®J"*JpJJJ be so designed tnat the platform can not overturn in thetuminr,insha. shaft.
Sec. 22. For vertical or incUned shafts, automatic Kawi. 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 ground landing and undergroimd landings when men are not entering or leaving the cages and coal or material is not being taken on or oflf the cages : Provided, That at the main bottom landing or levels from which coal is cased 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.
landings that are relarly 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 Protectinf fenced and the gates thereof shall be so constructed or JS'peTl'nd placed that loose coal, rock, or dfibris will not roll or fall s"ipthrough 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 simip extends below
12 Operating Regulations For Coal Mines.
the floor of a mine passage or excavation, it shall be adequately fenced or otherwise guarded.
Sec. 24. Shaft-sinking buckets shall be provided with
hook; self-locking safety hooks and, when the shaft is over 100
and oroeiiieadi. jjj depth, With crossheads and guides. The mouth
of the shaft 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
anS'uirder? rcqiiired to enter or depart from the mine between sunset
gronnd land- and sunrisc, 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 undergroxmd 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 such landing shall be painted and maintained white, or whitewashea at frequent intervals.
Sec. 26. All flywheels, gears, belts, and all exposed
moving parts that are liable to cause injury, or dangerous
parts of machinery used in and about a mine shall be
ouardi to ma- appropriately guarded to prevent injuries to attendants
Mdiatfoms.*' Other persons. Stairs, platforms, and dangerous walks
in or about the mine or stripping operation shall be provided with rails, fences, and gates.
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 in Safety factor the shaft or slope shall have a safety factor of not less
rope which shall be calculated by dividing the breaking
strength of the rope, as rated by the manufacturer, or in accordance with tests on a sample by the United States Bureau of Standards, by the sum of the maximum load to be hoisted plus the total weight 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 has reduced the safety
factor to below 4.5, as determined by tests of the piece
When to dii- showing maximum wear, when on inspection it is found
rop2 that the number of broken wires exceeds six in any single
pitch length or lay of the rope, when the wires on tne crown 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: Provided, however 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 com-
?>event person designated for tne purpose by the lessee. f upon inspection a hoisting rope or cable is considered
hSSSi rope?' unsafe; or if it shall be found to be below the requirements
Duties Of Lessee. 13
set foi*th in this section; it shall be put out of use for such purpose forthwith.
(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 not Attachmeiiti exceeding four months, and at least four feet of the rope to cage?*' shall be cut oflF from the end to be socketed or clamped, and clamping shall be so done that at least 80 per cent of the breakmg strength of the rope shall be attained.
(d) Hoisting rope shall be firmly clamped to the drum ,j Jj or reel, and at least two turns of the rope shall remain onto dmm or reel, the drum or reel when the cage or skip attached to the
rope rests at the bottom of the shaft.
(e) Every hoisting rope shall be treated with oil or Dreiung of with some suitable rope-lubricating compound at least twice every month. Such compoimd shall be chemically
neutral and shall be of such consistency as to penetrate the strand and not merely cover the surface of the rope.
(f ) The lessee shall keep a record in a book in the Keeordi kept office of the mine of every hoisting rope used for hoisting ?opei! or lowering men, noting the length and cross-sectionjl dimensions of the rope, the 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 the shaft and compartment in which the rope is used, the dates of resocketing, reclamping, and shortening, the 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 Ez&minationi of the lessee shall make daily a general examination of all hoisting equipment and mechanical apparatus for the equipment, hoisting or transportation of men in and aoout the mine, including skips, cages, guides, ropes, sheaves, hoists, motors, engines, and boilers; and once each week a more detailed examination shall be given and a memorandum of the condition of the above snail be entered in a record book kept in the mine office. Thorough internal exami- inipecnation of boilers shall be made at least semiannually. tion.
(b) If an inspection discloses a defective condition or Defect m aparrangement oi any apparatus, appliance, or device, which endangers the safety of employees or other per-tiier we. sons, that defective condition or arrangement must be remedied before further use endangers life.
Sec. 29. Where men enter shaft mines bv cage or skip, Raisinc and the cage or skip shall be lowered to the Bottom of the oTsSpprior*to ginning of a shift and before the men are permitted to be lowered.
Sec. 30. At the top of, and at each landing of a hoisting code of ngshaft or slope and in the hoisting-engine house, there shall t- be kept posted in a manner easily read a code of signals
14 Operating Regulations For Coal Mines.
for use in directing the operation of the cages. Said code shall be in accordance with the codes required by the State mining laws of the State in which the mine is situated, and if not otherwise specified the foUowmg code of signals shall be used : (a) "Wnen the engine is at rest, one signal, hoist; (b) when the engine is in motion, one signal, stop; (c) when the engine is at rest, three signals, men ready to get on the cage to ascend ; when this is followed by return signal from the engineer, the men get on the cage, and then the proper signal to hoist or to lower shall be given. Additional signals to suit the local conditions may be added by the lessee.
oEC. 31. There shall be at least two effective methods Two methods of signaling between the engine room and ach of the "'shaft or slope landings, one of which methods, in each case, shall be a telephone or speaking tube. The signals shall be so arranged that the eager or person in charge of each landing can signal 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.
Seo. 32. The lessee shall provide and maintain, in each Teiephonei 1116 where more than 100 men are employed underground an "intoM shift, a telephone system between the hoisting-engine room, the ground landing of the shaft or slope, 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 points 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 inside 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. Telephones 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
ventuatinj employed on any shift thelesseeshall pro videonthesurface
ve d whVre Other mechanical means for circulating within the
more than 10 mine such amount of ventilating current as may be
ployed?'* "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 noncom-
bustible 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
Duties Of Ussseb. 15
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 bo
mine openings in order to protect said fan or other
mechanical means of air circulation in case of a mine mine entranoo.
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 miich can oe quickly connected and operated should the electricpower fail.
(c) That during such time as the mine is being opened, Tmporft?y up and less than 100 men are employed underground onlSiSf any shift, and with the written approval of the authorized representatives of the lessor, a fan of sufficient capacity may be set up temporarily while the permanent
fan is being erected.
(d) A mme in leased land may be ventilated by means of a fan of a mine not on the leased land when less ftteS nndJ than 25 feet from any projection of the nearest sidctioM**" 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: Arid further provided j 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 methane, as determined by samples gathered by the lessor's representatives and analyses made by the United States Bureau of Mines: And further provided , The airway connections to the mine in leased land are protected by rockdust barriers or equivalents in accordance with specifications given in puolications of the United States Bureau of Mines.
Sec. 34. Electrically driven auxiliary or "booster'' Auxiliary or fans may be used in nongaseous mines when there is no5o*niVon*t exposed inflammable material within 10 feet of the fan and motor.
Sec. 35. An electrically driven auxiliary fan may only to be used in a gaseous mine when located on the intaking Kaieou mtoai. 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 further provided. That there shall always be an experienced gas mspector or fire boss in 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 the fan is oiled and running properly. Auxiliary or booster fans may be used either in a gaseous or nongaseous mine when driven by compressed-air engines or equivalent which can not ignite gas.
16 Operating Regulations For Coal Mines.
oUShjVooMUt auxiliary fan within a mine shall not be tan*. considered adequate if the air currents are caused to re-
circulate by such fans to an amount exceeding 10 per cent of the volume circulated by the fan.
qatntiVSJi" 3- Icsscc shall provide a ventilating current tiiating onrrentof uot Icss than 100 cubic f cct of air per minute for each per man. persou employed imderground on any one shift and 500
cubic feet for each mule or horse; or such larger amounts as may be required by the regulations of the State in which the lease is located; said ventilating current to be measured in eadi of its various splits at the last entry, crosscut, or break-through nearest the face, for the
one epiit of aiz than 75 men shall be employed on any one split of air cnzren . ciuTent, unless the mining supervisor gives written per-
mission temporarily to employ a larger number. mSe"ltr*U di- Shjo. 38 (a) A working place, entry, or passageway termined by shall not be deemed normally m a nt 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 duplicates gathered at intervals of not less than two days apart by me mining supervisor, district mining supervisor, or deputy mining supervisor, each show on a moisture free basis more than H per cent carbon dioxide or less than 19 per cent oxygen. The lessee upon being notified of such finding shall unmediately undertake measures to improve the quality of the air of said working place or entry. Determbiattoii (b) For the puTposes of these regulations, a mine or mineo/iTict portion of a mine shall be deemed gaseous if so defined in game. jy mine inspection department of the respective
State in which the lease is located, or if the mining supervisor or district mining supervisor shall, on three occasions, not less than two days apart, determine by tests with approved safety lamp or by chemical analysis the presence m 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 taken 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. ..f2y!2S*!iJ (c) If in a mine, or district of same, deterrrdned as
leoona lenei oi,'., '., A i
teiti may be above to be gascous, the mine examiners find no tire damp mine aieoni or a period of six months following first determination, the condition. 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 gaseous state shall determine the mine to be yeafriodfc gaseous for a period of at least two years, when a similar
series of tests may be made to determine whether the
Duties Of Lessee. 17
mine continues gaseous, and similarly, each two years, tests may be made. If after any series of tests above specified, the mining supervisor, from the favorable te?tli 'anS'Jw! results of the tests and of the mine examiner's records, J/J" noneaw* considers the mine or district in same can be rated non- o. gaseous and without greater hazard than presented by nongaseous mines in the region, he may so rate the mine and notify the lessee.
(d) From the time the mine or district of a mine ispJVitedVn first determined to be gaseous until determined by the gaseong mine or mining supervisor to be nongaseous for the purpose of ?i}iV*'"permuwithese regulations; and unless rated noiaseous by the respective State mine inspection department, the lessee shall permit no open lights to be used in said mine or district, out only locked 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 saseons mine or in a mine, or a mine has been determined to be gaseous 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 permissible flame or electric safety lamps and are in a safe 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 estal)lished within a mine, a fire boss or exammer shall 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 means of causing ignition of gas other than explosives, which shall be handled and used as hereinafter specified.
Sec. 40. (a) The lessee shall appoint a niine superintendent who shall have at least five years' experience in intendent. and around coal mines, who has a practical knowledge of mine gases, timbering and mining machinery, and whose qualifications are at least equivalent or superior to those required for underground foremen in gaseous mines as specified W the respective State laws, or if not specified, the qualifications shall be in accordance with the best requirements of the mining region for similar positions. The mine superintendent may have jurisdiction over one or more mines on the lease.
(b) A lessee duly qualified in accordance with thceeJie'asuperforegoing may serve as superintendent. quaufled.*"*
Sec. 41. (a) The lessee shall appoint for every mine Leasee shaii employing more than 25 men underground on any oneSJfJ*! shift in each separate mine on the leased land ftn ex-™*
38401°— 21 3
18 Operating Regulations For Coal Mines.
peritoced mine foreman of qualifications of at least five years' 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, m Jr???v"* (b) When there are 25 men or less employed under-
underground, ent may also serve as the mine foreman, provided he is
qualified to do so by the respective State regulations.
foremen. are employed underground on a shift, the lessee shall ap-
point 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 mine. Mine foreman (b) The foreman or an assistant foreman, if duly may serve as fire qualificd in accordaucc with the respective State regulations and his other duties permit, may also serve as fire boss or mine examiner. Appointment Seg. 43. (a) The Icsscc shall appoint a Sufficient number Sane %wS3ner' of fire 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 quantity 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 enter, oneflre boss for (b) In any ffaseous mine there shall be at least one SiioWinSJe" experienced fire boss or mine examiner for every group ous mines. 75 or fraction thereof employed underground.
renctng and Sec. 44. The fire bosses or examiners shall fence off d "n g'e r o us and mark all dangerous places to prevent the entrance pUces. Qf uiejj ijtQ such places, shall record in chalk on a black-
board or eauivalenf 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.
dangerous con- the time being in charge of the mine, or any part thereof, JUot" ' that; by reason of the prevalence of inflammable or
Duties Of Lessee. 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 found dangerous. For the purpose of this section, a place shall be deemed dangerous ii the percentage of inflammable gas in the general body of the air is found to be as much 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 no men to enaccidentally stopped or have been shut down for repairs, Jjj berraSSoi or the ventilation is otherwise interrupted for a Period ojentiiation of more than 15 minutes; or in a so-called nongaseous ized. 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 fire bosses or mine exammers have returned to the surface and reported to the mine foreman that they have examined all the places and it is safe for any or all of the men to enter.
Sec. 47. When any body of methane or fire damp of Removal of 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 permitted in the mine while this is m progress.
Sec. 48. The quantity of air in the main current ®f; in every split shall be measured with an anemometer orineaiiremeiitfi. approved equivalent at least once every week by the mine foreman or fire bosses and entered 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 recordinV snare employed underground on any one shift shall be stmmcnts. equipped with a recording instrument hj which the ventilation pressure shall be continuously registered. The registration 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 changed in speed except by orders of tne official then in reversed uuess
i? jiF J J 1 T £ authorized by
charge of the underground workings, in case of ex- official in charre. plosion or fire, if the underground official in charge can not be reached, the superintendent of the mine, or in his absence, the official m charge of the surface, if thoroughly conversant with underground conditions, may take the responsibility of stopping, reversing, or changing the speed oi the fan, provided mis proceoure is in accordance with the respective State regulations. It should be fully understood, and a notice posted in a
20 Operating Regulations For Coal Mines.
suitable place in the office of the mine and in the fan
house to the effect that the fan should not be stopped,
reversed, or changed in speed under any condition except
by direct orders as above.
dMje?oS?jo2- Sec. 51. (a) The fire boss or examiner shall record the
ditions yflre findings of dangerous or gaseous conditions in accordance
OM or exam respective State regulations, and in addition
each fire boss or examiner snail have a book in which these findings are recorded, and on returning to the surface shall place same in the official office of tne mine, or if this office is more than half a mile distant from the exit, shall temporarily place it in a suitable and secure place adjacent to the exit, should his duties require reentering the mine. Fir6-bo88 re- (b) The rcports of the fire bosses or mine examiners cop I e'da n d shall be assembled and copied once a day in a record book ngned. iiept in the office of the mine and signed each day by the
fire 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 worked-out areas, or areas abandoned
area*'*by*°flre- permanently or temporarily, that can not be so ventilated
proof stoppings, as to prevent the accumulation of explosive and noxious
gases, or by reason of the conditions can not be daily
mspected by duly authorized mine officials, 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 behind the stopping.
Bore holes to (b) When inflammable gas is liberated in sealed areas
?ifiS?to dSS in such quantities and under such pressure that it leaks
Soni through the stopping or surrounding pillar, and enters
the air current \micn 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 in diameter. The holes shall be located to enter the highest parts of the sealed area. The casings shall extend 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 gauze placed in or over the casing, and there shall be a balanced check valve in the casing to prevent entrance Gas drain pipe of air whcu pressure within the sealed area is below atmostongh stop- pheric pressure. In the event that said bore hole is not feasible, or if drilled does not relieve the gas pressure
behind the stopping, a pipe line not less than 3 inches in diameter snail be put through the stopping, and to discharge the gas shall extend into a return airway that does not ventilate any live working or haulage or traveling way. The end of the pipe all be protected by
Duties Of Lessee. 21
gauze and a check valve and that portion of the mine shall be deemed gaseous.
Sec. 53. When crosscuts or break-throughs are no ventuation longer used for the passage of ventilation they shall be closed on main haulage entries with stoppings made of incombustible material and sealed as air-tight as possible; 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 rooms 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 Driuinc hoiei 100 feet of any portion of a mine not known to be free a ppr coaching from gas or dangerous accumulation of water, the advance workings or headings shall not exceed 9 feet in width and there shall be cons tan tlv at least one bore hole, 18 feet in advance, drilled centrally in the face of each heading; and when within 50 feet of conjectm*ed 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 the axis of the entry or workings, which holes shall be drilled at least 18 feet deep.
Sec. 55. (a) The following regulations govern the Eiectncai reginstallation and maintenance of electrical equipment 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 foregoing voltage and does not exceed 650 volts, the supply all oe deemed medium voltage.
(d) Where it exceeds the latter voltage, the supply shall be deemed high voltage.
Sec. 56. No voltage higher than medium shall be used Limitation of underground, except that high voltage may be used f or S"i*?|%';'u ?d transmission or for application to transformers, motors, or other apparatus in which the whole of the high voltage winding is stationary.
Sec. 57. All high- voltage power lines installed underground shall be m the form of insulated, lead-covered requirements." cables, which shall be armored or otherwise eflfectively 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 props.
Sec. 58. Locomotives, portable pumps, coal cutting voitaee of machinery, and other portable electrical machinery used in*drcuttinp in or about working places that are near the face of the SJp'umSed mine, or on roadways traveled by men, shall use only to low voltage, low-voltage current.
22 Oi>ERAtllG REGULATIONS J*OR COAL MINES.
i.®*ff*i Sec. 59. Simal wire circuits shall not use over 30- volt
limited to 80 o
volts. current.
Supports of Sec. 60. (a) All underground electrical power cables and
electric wires i i i i j F ii-
and cables. Wires unless provided with grounded metaluc covering or
as specified m section 57 shall be supported by efficient insulators. Guards for (b) Cables and power wires unprovided with grounded
wSereesafS metallic covcriug or equivalent snail not be fastened to
abov?Soor.'***® 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 where 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. Troiieywire (c) AH trollcy wires shall be placed at least 6 inches
p acemen outsidc of the rail of the track, and wherever possible on
the opposite side of the passageway from that used by men tor traveling on foot; and where the trolley wire is less than feet above the rail and on the same sides of the entries of passagewavs used for traveling or where men cross under it shall be protected by troughs or side board like those specified in section 60b. Man trips run on motor roads does not construe that the road is a traveling way within the meaning of this section. Underground Sec. 61. (a) All Underground electric stations shall be
electric stations. xjjxii Eix* xi a. -i
fireprooied and at ail 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. Electrical to- (b) AH electrical installations are to be installed and safes? method, uscd SO as to insure the greatest safety to workmen.
Warning (c) Where high voltage is used, fixed warning signs coiorsf' shall be conspicuously posted, and the color of the insu-
lation used on high-voltage wires in electrical stations at transformers and switches shall be different from that used on the medium or low-voltage wires. Trolley and Sec. 62. In any mine which is termed gaseous or in h)comotiverin which more than one-fourth of 1 per cent of inflammable StakeaSways fouud in the moving air current, trolley locomooniy. tives 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 the haulage is through a crosscut to the intake entry that is located nearer the face than any room or branch entry turned off from, or con-
Duties Of Lessee. 23
nected with said back entry in which the air current is returning, and also provided the air current does not contain over one-fourth of 1 per cent of inflammable gas as determined by sampling and analyses.
Sec. 63. All electric locomotives shall be provided with efficient headlights, and the front ena of all cart, trips 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 the aiectncity percentage of inflammable gas in the general body of the methaneifpreiiair in that place is found to exceed 2 per cent, the electric be out on. 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 inflammable gas exceeds that amount.
Sec. 65. (a) Drills and undercutting, shearing, or loading jEiectrtcmiii-
machines, pumps, and other machines, when electrically at', "Sfeawoui driven, and uninclosed electric switches shall not be"'"* 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 Testi required being used in a gaseous mine or district, in addition to |f/"31?trfc?i frequent tests for gas to be made by the machine run- when euctnc ners, the lessee shall be required to have a fire boss orSSd. 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.
(c) The examiners shall keep a record of all findings of ©o'dsofgw gas, and if 2 per cent of gas is found in the general body examSiers. of the air of the working place or in a large pocket, the machine or machines in me vicinity must be stopped and
the men withdrawn from that district until the gas has been diluted and carried away by the ventilating current.
Sec. 66. In gaseous mines electric lighting circuits may Electric iihtbe used only at the foot of the intake shafts and in the ££ik?oBly! intaking main roads in which the air current contains not more than one-quarter of 1 per cent of inflammable gas as determined oj samples gathered from time to time by the district mining supervisor and analyzed by the IJ'nited States Bureau of Mines.
Sec. 67. (a) In every mine in which electric drills or cut-out cutting machines are used, the portable cables shall be JJJJk pJJ,' connected to the power line by interlocking safety switches accessible to the working place where drills or undercutting machines are used and within 500 feet of the point of each installation of pump or auxiliary fan.
24 Operating Begulatioks For Coal Mines.
csifcStJaViSei Cut-out switches in the trolley lines and lighting ▼ais. circuits shall be placed at the mouth of each branch
entry and elsewhere at distances not exceeding 1,000 feet. EuctTio cur- (c) Electric current, by means of cut-out switches, iroin*unu*8e*d shall be cut off from districts of the mine when men are parti of mines, working in such districts, and wires permanently disused shaU be disconnected from the source of current. BtauaSon.**' 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. titeuicli 69. At a mine where electricity is used undereqiupment shall grouud f or powcr purposes, the lessee shall appoint a man be in charge of the electrical equipment who is fitted for his position by ability, training, and experience. The character of the equipment 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. Precantions to Seo. 70. When mining: operations approach oil or gas
approaching oil n -, , , i . ' i
or gas weus. weils or borc holes which may contain gas under pressure,
the lessee shall present his plans of mining the coal in 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 in such manner tnat 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 mine 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 mine. LocomoHvesor Sec. 71. (a) Locomotives and Other in tcmal-combustion combustion ™ engines, pumps, hoists, and other machines shall not be foists,' eSjta sed in a gaseous mine or district, and may only be used loinw! XIX tunnels, drifts, and entries where the air current is suffi-
cient to dilute and render harmless the exhaust gases, and to this end the percentage of carbon monoxide given off by the exhaust shall not exceed two one-hundredths of 1
Eer cent of the air current. The air returning from the aulage road of the locomotive and other internal-combustion engines shall not be circulated through the active working places. Exhaust of (b) where the exhaust of a stationary internalgasoiine engines, combustiou engine can be piped to the surface, this will be considered an adequate provision permitting the use of such engine, if in other respects the installation is properly made with regard to prevention of fire or explosion resulting from the use of tne engine. Transporta- (c) GasoHue or other highly inflammable oil used in the SJderfSd"''* internal-combustion engines when taken into the mine must be in tight containers to replace the emptv containers of the respective locomotive or engine, and in no
Duties Of Lessee. 25
event shall such inflammahle liquid be poured from one contamer into another in the mine.
Sec. 72. (a) Hay, straw, or similar highly inflammable Yiindung\i7 material taken into a mine shall be in compressed bales or undergroimd. covered with tarpaulin or in a closed car and shall not be handled when unbaled in the presence of open lights.
(b) Hay sent into a mine shall be promptly delivered to nnd?rf?2nn*J the stable and stored in a locked compartment with fire- SmitV/ 7c? Yb proof lining and door. The amount of hay stored underground at any time shall not exceed the amount normally consumed in 48 hoiu, except that when public holidays occur together sufficient supply may be stored to last over same.
Sec. 73. (a) Not more than one barrel or tank holding 52 outiientoto gallons or less of lubricating oil shall be taken inside of and stored m any mine at any one time, and there shall be not exceeding two barrels of oil in the mine at one time.
(b) Such lubricating oil shall be kept in a recess or chamber in which there is no exposed inflanmiable material, such as timber or coal, and which has a cement floor; such chamber shall be provided with a self-closing iron or steel door set in an iron, concrete, or masonry wall, and said chamber shall not be located within 100 feet of any shaft.
(c) Buckets or drip pans shall be used for catching the ?5cYudrip or leakage from tne oil barrels or tanks. A supply tionS. of sand shall oe kept in a suitable container' located not
in the chamber but near by for use in case of fire.
Sec. 74. (a) To lessen the danger of coal-dust explo- ?f*I!;?®i.,®'
sions m every mme producmg dust of an explosive char- iiom.
acter, unless the floor, roof, and sides of the roads are
naturaUy wet, arrangements shall be made and methods
adopted, as follows:
(b) When the coal in screening and loading on the sur- dJAcait *iiiaft face produces much dust and there is a downcast shaft within loofeet'of within 100 feet of the screens and loading chutes, the top
of the downcast shaft shall be surrounded oy iron sheeting or other noncombustible material for a height up to the level of the upper landing.
(c) Mine cars shall be constructed and maintained as .™*lo''„,o'
(ii 1111* 1 cinst aocnniQui"
tight as possible and loaded m a way to prevent coal ortion. coal dust from escaping from the cars while in transit. Tight-end cars emploved in connection with rotary dumps shall be used wnere practicable; otherwise, tightfitting doors or gates shall be employed;
(d) The floor, roof, and sides of haulage entries shall be systematically cleaned to prevent, as far as practicable, coal-dust accumulations;
(e) In mines and parts of mines which make or may irifS? or*noninmake dust of explosive character, as may be determined JJJJSJS' 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 application of
26 Operating Regulations For Coal Mines.
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 raised into the air by concussion.
(g) If the dry rock dusting method is used, there shall be sufficient rock, shale, or other inert dust added and distributed systematically along the entries, slopes, tunnels, and escape ways so that the mixture will not be explosive when brought up in suspension in the air; to
Detenniiiation this end, the ash content of the mixture shall be deterof duSby aniS mined, from time to time, by sampling and analysis by the lessee in accordance with the prescribed methods of
the United States Bureau of Mines. The ash content plus the moisture shall 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. Roek-dnst (h) In all dry districts or panels of mines not naturally trSce"to*pS'wet throughout, rock dust or shale dust barriers of a a 'mtneand* ?n Specified or approved by United States Bureau of connection with Mines shall be erected and maintained at the entrance of adjoining mines, district or panels and in all connections to an adjoining mine.
leased tract tract from an adjoining mine not on the public domain, jobSnl nSe.* " 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 regmations that relate to the safety of the mine and its employees;
(c) The only connections oetween 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 abandoned 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 public 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 mine on the leased land.
n 1 s h e d as whenever needed at or near the place where needed for needed. timber and other material and supplies as are
DtJTiES OF LESSEE. 27
necessary to the proper and safe conduct of the operation of the mine.
Sec. 77. (a) All explosives except those for immediate i-nation of use in the mines as specified hereafter shall be kept in sur- uSie. face magazines, which shall be located away from active or used mine openings, buildings, dwellings, and places where persons congregate, at distances proportionate to the quantity of explosives as specified by the United States Bureau of Mines; where the locality is mountainous, modifications of such distances may be made with the written approval of the mining supervisor, if the natural barriers justify.
(b) A suitable dry underground chamber with wood underffronnd lining and flooring so constructed and maintained that JJJJ'jjJt'to'be there will be no exposed nails, may, with the written approval of the mmmg supervisor, be used m place
oi a surface magazine if adequately ventilated and with sufficient cover, surrounding pillars, and strong bulkheads not to be dislodged in a manner to endanger a mine, building, or dwelling. The surface entrance to such magazine and the ventilating ducts shall be guarded by fences, gates, and the appropriate warning signs. In no case shall the magazine have any connection with any part of a mine in which men work. When the entrance to the magazine is a drift or slope which points toward any active or used mine opening or toward any building or highway, coming within a distance specified in the table of distances for the quantity of explosives stored, an earth barricade shall be erected opposite to and as high as the entrance.
(c) Detonators or blasting caps shall not be stored Detonaton in with other explosives but in separate magazines. S?e"*
(d) All such magazines shall be xmder the charge of a competent person or persons designated by the lessee or his agent and kept securely locked except when said authorized person or persons are on duty at their respective magaz nes.
(e) AU storage magazines shall be constructed andif.t;*"i'*
-.lii 11-11 'n constructed in
maintained in accordance with the published specmca- accordance with tions of the United States Bureau of Mines at the time of ifinefMSiicaapproval of these regulations.
Sec. 78. (a) Thawing shall not be conducted in explosive pioJivMrTocastorage magazines and a thawing house, where necessary, 8on of thawing shall be located not less than 250 feet away from ex-
f)losive storage magaz'nes and at least 300 feet away rom 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.
(b) Explosives of whatever character shall not thawed, kept, or stored in dwellings or other buildings t h a w e d or on leased lands, except in the magazine and storehouses JJcSied! designated by the lessee and in accordance with these regulations.
en.
28 Operating Regulations Foe Coal Mines,
ient* toto* mjie miiies where the explosive is distributed to to be distrtb- the miiiers underground, the distribution shall be done as
manner set forth in section 84. torwof %x- Iiiniines where explosives for any blasting operpiosivee under- atiou are handled and the holes charged by the foreman ground. designated shot firers and it is necessary temporarily
to store explosives, this storage shall be done in suitable magazines made in the solid coal or rock at least 300 feet distant from any shaft or main slope or 50 feet from any traveling way or intake airway, and shall be provided with a strong door which 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 before 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 expected 24-hours' requirement, including any surplus remaining from the previous dav. Amonnti of Sec. 81. In mines where the miners charge their own mSted pog- blasting holes, not more than 10 pounds of black powder senion of min- j. jj black powder 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. Miners to keep Sec. 82. The Icssce shall require the miner, or miners, tfght wVodenking in the same working places to keep the powder box. 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 oattens 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, flame, 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 by flying pieces of coal or rock or from ignition oy blown-out shots, suiting caps Sec. 83. Blasting caps or detonators shall be taken ratefyfrom* ex- iuto the mine in separate containers from other explosives, piosiTei. shall be transported and kept in an adequate mois-
ture-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 Lessee. 29
point where other explosives are kept and where there is no danger of being struck by flying missiles from blasting or from a fall of roof.
Sec. 84. (a) In mines or parts of mines in which elec- tSnipo?tfac tricitjr is used as a source of power, when the power giosivei m circuit is not completely cut oft while taking explosives in quantity for further distribution into a mine, these explosives shall be transported only in a closed powder Minen cwrycar or box constructed of electrically nonconducting material, and with no bolts or nails exposed on the trtEuted?© mini inside of the container; and no persons other than ex-u?iSntaS!rf" plosives distributors and men necessary to operate the trip shall ride in or on such trip carrying explosives in
(b) The lessee may permit men to carry their individual supplies of explosives into the mine, provided the explosive and detonators are being carried m 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 nonconducting containers to miners as they enter the mine or to them at underground distributing points. No smoking shall be permitted by men engaged in transporting explosives or by any one in the vicinity of explosives bemg transported or stored.
Sec. 85. In mines where electricity is not used as apJiii'iiiiJcnt source of power or in mines electrically equipped, if the jj' tortelectric current is cut oflf from other than properly bi5i2* installed lighting circuits when explosives are being transported, explosives in bulk may be taken into the mine in an ordinary mine car when propelled by man, animal, or cable.
Sec. 86. (a) In any mine or part of a mine that by these Permisiibia regulations is termed gaseous, no explosive shall bequ&ed'ingaseemployed 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 tests.
tests with a miner's permissible safety lamp or an equiv- examination for alent approved by the mining supervisor have determined
that less than 2 per cent of inflammable gas is present and inspection has been made showing that there is no accumulation of dry inflammable coai dust adjacent to the drill hole : Provided j
(c) That other explosives than permissible explosives .,f
may be used in a gaseous mine or district until such time from guface. as they prove dangerous to life and property, if the shots are fired electrically from the surface when all persons are out of the mine. The electric firing circuit shall be installed and maintained in accordance with published recommendations of the United' States Bureau of Mines,
30 Operating Regulations For Coal Mines.
e5?o5*e?may EC. 87. In a nongageous mine or part of mine that be nsed In non- bv these regulations is termed nongaseous, black powder
under certain or Other nonpeimissibie 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 mining supervisor or district mining supervisor: Provided The snots shall be fired only after inspection by authorized persons and fired electrically from the surface when no one is in the mine; or fired by shot firers appointed by the lessee when all other persons except the shot firers and officials authorized by the lessee are out of the mine: And further provided, The charge in any hole shall not be more than 5 pounds of black powder or equivalent of other explosive: And further provided, No shot shall be fired by shot firers or electrically from the surface if in the opinion of the shot examiners or shot firers it would be a shot likely to blow out.
h<?e?ta tltJL Holes drilled in coal for explosives shall not
exceed 4 feet in depth, unless the coal is of greater thickness than 4 feet, m which case the hole snail 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 6 inches than the depth of bechiSed'aS the Undercutting or shear. No holes undeiound shall the* bwde]?**i8 charged and fired when the burden of the shot is too too great. great; that is, if the distance from the inner end of the nole measured at right angles to the axis of the hole does not reach a free face within a distance of 5 feet in 'shooting off the solid,'' or 6 feet where the face has been completely undercut or sheared, t'emmed with Sec. 89. All shots that are charged with an explosive noncombustibie. s]all 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. Making n p Sec. 90 (a) . When black powder or other bulk explosives charge. uscd, the ncccssary charge or charges shall be
made up at or near the box where me explosive is kept.
any powder box while an explosive is being obtained
therefrom and during the process of fiUing or preparing
the charge or cartridges.
b?o?e'ned'by (c) Kegs of powder shall not be opened by punching
Ei'conSSner** a hole in the container either by iron or wood tools, but
the opening provided by the manufacturer shall be used for pouring out the powder.
misflres. 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 mine before the next succeeding shift.
Duties Of Lessee. 31
Sec. 92. (a) The lessee shall diligently prospect for, tiiJ?tofbSSrdevelop, and mine the coal in or upon the leased lands eticaiiy proieshall carry on all mining or stripping operations in good and workmanlike manner, having due regard to the health and safety of miners and other employees as specified herein; and shall leave no available coal abandoned which could be recovered by the most approved methods of mining when in the regular course ol mining operations the time shall arrive for mining such coal. ©"ba - entry, level, or panel workings of which the pillars have domed save with not been completely extracted shall be permanently p,oJi**'' *P" abandoned and rendered inaccessible, save with the written approval of the district supervisor or mining supervisor.
(b) The lessee, whenever any mine or any section of 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 the map or maps of the underground workings herembefore required, and shall promptly forward blue prints or reproductions thereof in duplicate to the district mining supervisor.
Sec. 93. Stripping or surface mining pits shall not beds permitted in the outcrop of dipping coal beds where theJSafi not be topography of the surface with relation to the pit will not JJf allow self-drainage or drainage through ditches or adits way 'ro from the face of the 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 compHance with the terms of the regulations and lease.
Sec. 94. (a) The lessee where more than one bed of coal jaYtiids of is known to exist in the leased lands, shall not draw or cofi are present,
remove the pillar m any lower bed bet ore mining tncbeds are to be available coal in each known upper bed of such thickness that it can be mined under the then existing commercial extracted, conditions either alone ot in combination with the thicker beds, unless it shall be decided by the mining supervisor that the workings or conditions for subsequent mining in any or all of the upper beds will not be seriously injured by the extraction of the pillar coal in the lower workings.
(b) Where mining operations are in a bed that lisJJJJ either below or above another bed in which mining has ranged Terticai been or is being carried on, and where the vertical distance piJur'J inYnbetween the two beds is less than fifteen times the thickness of the lower of the two beds, as far as practicable the lessee shall, if the room and pillar system is emploved, so arrange the pillars of room and panel pillars that tnose in the lower bed shall be vertically beneath those in the upper bed or vice versa; modifications of thispro vision may be necessary in steeply dipping beds. Where the long-wall method is employed and tne gave or excavation prope ly packed, this provision is void.
32 Operating Regulations For Coal Mines.
calMi'iipr Where practicable, by reason of either commercial
bed worked lint or mining Conditions, the available coal in the upper beds
ow bed!"** shall be worked out before the coal in the lower beds is
mined, otherwise the workings in the upper coal bed shall
be kept in advance of the workings in each lower bed.
moTed In ad- system of mining is adopted by the lessee which requires uaderocTm! advance workings in tne solid coal, including entire?, and-pttiar*' lys- crosscuts or break-throughs, and rooms, the lessee shall not, without the consent in writing of the minmg super-
visor being obtained, extract by such advance workmgs 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 cover, viz, not more than 60 per cent when the cover is less than 500 feet; not more than 50 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 Computing cover is over 2,000 feet. In figuring the percentages for A'of £mi*ez- advance extraction or first minmg of the total area of the traoted.'* tract imdcr consideration, the 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 lines 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 of the bed. In figuring the area of advance extraction or first mining, the area extracted from pillars within the tract imder consideration, if pillar drawing is sy3tematically 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 protection of overlying coal beds or important surface idly ae possible, structures, that all pillars shall be mined and removed as rapidly as proper mining will permit.
5men?o*?e*em- lessce siiall uot employ more than five
ployed in new men imdcrgroimd on any one shift in any drift, level,
se?o?l'efro*8ientry, slope, room, or working of any mine, unless such
proTided. working place shall be so connected with an adjacent
working place, slope, or tunnel as to provide within a
distance of 200 feet of the face of the breast a second
zzoeptions, lomeaus of egress; except that, with the written approval
make connec- 01 the minmg supervisor, not exceeding 10 men on any
*P" shift may be employed to make such second means of
egress, provided adequate ventilation is obtained by large
pipes or ducts, or by brattices or partitions; but in no
case shall any rooms, entries, tuimel9) or branches be
Duties Of Lessee. 83
turned or worked oflf the single place being driven until
such second means of egress is obtained; except that shau not work
crosscuts may be driven off connection to a parallel pas- braneswhiie
sage as provided in section 18d and stubs for turnouts nacttoL
or switches not over 10 feet long from the side of an entry,
tunnel, or slope may be made.
Sec. 97. (a) There shall be left in each coal bed being, "'/'JJ mined, for the support of each shaft, main slope, orJafti. aiopei. egress, a pillar of size proportionate to the depth of the coal bed below the surface and the thickness of coal diameter of the pillar in each bed being mined shall be inceiMrai eaoai equal to the height of the surface egress above the lowest point of the pillar in the respective bed, this ratio being modified by the surrounding natural conditions such as dip of bed, strength of coal, and rock material. Similarly 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 lees than 100 feet in width.
(b) Shaft and slope landings, sidings, entries for haulage, ventilation, manways, and stables may be Siaft'andoiM excavated in the pillar if timbered or lined in a permanent p*"*'"- 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 rii*25d**Sope may be extracted as the time of exhaustion of the minepuian. approaches, or prior to this time if replaced by tiht packing as approved by the mining supervisor in writing.
SBC. 98. The lessee shall not, without the consent of the district mi n ing supervisor first had and obtained, mine any coal, (feveVy underground working, 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 adjommg 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 01 the mining supervisor, mine out and remove all the available coal in such barrier both in the lands covered LeiMe may be by the lease and on the adjoining premises whenever same can be mined without hardship to lessee, provided, on'ad'jaoeVt where the coal mining rights in such adjoining premises are not owned by the lessor, an agreement may be made
84 Operating Regulations For Coal Mikes.
by the lessor with the owner of the adjoining coal and
' tie lessee of the coal, if any.
on uchtand Seg. 99. The lesscc shall not, save as hereinafter
authorized, light, keep, or maintain any fire for heating
proJUDifo. unattended open light in any strippmg, except as
approved by the distinct mining supervisor, or underground in any mine, in contact with the coal in place, or in or along the outcrop of any coal bed. Failure to take prompt and vigorous steps for the extinguishment of any sucn fire shall be sufficient ground for the entry of the lessor to remedy said condition.
iB amies where dcrgroimd on any one shift, there shall be a supply of water employed!" OH the surf ace available lor fighting fires in and about Water barrel! niine. If this supply of Water is not furnished through In mine. pipes, hydrants, and nose, it shall be kept in barrels of
about 50 gallons capacity, painted red, with covers, and a 2-gallon bucket or can, painted red and marked, not use except for fighting fire/' shall be hung or placed immediately adjacent to each barrel. These barrels shall be maintained full of water. Barrels in a mine where pipe lines and hose have not been installed shall be placed near the bottom of each shaft or slope and at principal junction points not exceeding 1,000 feet apart on a main haulage road. Provision shall be made to keep the water in barrels or pipe lines from freezing. Chemical fire extinguishers having a capacity of not less than 2 gallons may be substituted for barrels of water. xnitoiutioB of (b) In every mine in which over 200 men are employed ?fir£i?SM'to underground on any shift, and in which a sufficient water supply is securable, by moderate expenditure, dergronnd. 'within 1 nule of a mine shaft or slope, the minmg supervisor may require, if the conditions at the mine in his Pipe line and make it advisable, the installation of a pumphoieimnineforing systcm, tank or reservoir, pipe lines, fire hydrants 2 inches in diameter and extending at least 500 feet on either side of the main hoisting shaft or slope to the first working levels, with suitable attachments for hose not over 100 feet apart and with at least three 50-foot lengths of IJ-inch hose with standard pipe thread connections and nozzles at appropriate points for immediate use. Such pipe lines shall be so located and installed that water will not become frozen. Pressurereducing valves or equivalent shall be so placed that the Eressure will not exceed 50 pounds per square inch at the ,. jdraiit or point of attacnment of the hose.- In any
water uaei for°"® where such pipe lines and hose are installed and hoM. maintained, barrels filled with water as specified imder
section 100 will not be required within the areas reached by such pipe lines, provided there is an adequate supply 01 water for emergency fire fighting to which the water pipes are connected, ripe lines of a water sprinkling or drainage system which are connected with a sump con-
DtJTIES OF t-BSSEE. 35
taining over 5,000 gallons of water fulfill the reguirements of water supply and pipe lines underground ii provided with taps, valves, and nose.
Sec. 101. The lessee shall arrange, as far as practica- Manwayi ble, manway passages free from regular haulage for the prodded as passage of underground employees to and from their practicaworkmg places. Such manways shall be maintained in good order and free from loose coal and rock, and signs with arrows shall be provided showing direction toward the escapeways on eitner side of crossmg or intersecting 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 anv mine in which more than 10 men are shelter iioiei employed undergroimd on any shift, all entries, tunnels, roads, ana 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 of not exceeding 60 feet; the shelter holes shall be at least 4 feet wide, 4 feet deep, and 6 feet high, unless the entry, tunnel, or slope be or less height, when they shall be oi the same height and level with the road, and shall be kept whitewashed and free from debris.
(b) Where the clearance between the mine car and rib 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 and free from d6bris.
(c) On haiilage roads not used as traveling ways, shelter holes will not be required provided there is a clearance between the mine car and the rib of the entry of at least 3 feet. Shelter holes shall be on the opposite side of the road from the trolley and power wire.
(d) Where there are crosscuts at intervals of not over crosscuts and 75 feet or in entries off which rooms are turned not more'®®™ necks may
- - - 1 1 serve as sneiter
than 75 feet apart, the mouths or necks of the crosscuts hoiea or the rooms when maintained as above provided, may serve as shelter holes.
Sec. 103. (a) At the top of any slope or incline used for oj haulage, there shall be an automatic stop block or asfope*or**Snspring derail which will stop or derail cars, except when held open by an attendant by means of a lever or other appliance while cars are passing under control.
(b) Switch levers must be installed to avoid the danger switch-never
M A ' ' J 1 axranenieiix.
of men trippmg over them.
(c) Frogs and guard rails shall be properly blocked. aard %ans
(d) When haulmg men on slopes and inclines, safety p rVp e'r i y catches, or a special man car giving equivalent result, safety catches shall be installed when practicable; othei-wise when haul-<" safety man
mg men on slopes or inclmes, safety hitcmng rope or chain of ample strength shall be employed, extending from the rear car to the main hoisting rope.
Sec. 104. (a) Allconnectionswithadjacentmines,if notwith'adjacent used for haulage escapeway exits or airways, shall be if*°ope* sealed with stoppings which shall be fireproof and be may be closed built to withstand a pressure of 50 pounds per square SJe aoorsf*''*
36 Operating Regulations For Coal Mines.
inch on either side, calculated by a formula or method approved by the United States Bureau of Standards. miB? connect There shall be installed in any open connections ttmu, substantial iron or concrete fire doors, set in substantial
fireproof frames, which may be closed in an emergency
bj authorized officials but which may be reopened from
either side to jpermit the escape of men who may be trapped
behind them in case of fire or explosions. Such doors snail
be installed in duplicate, and tne distance between doors
shall be at least 40 feet.
siaek a&d ref- Sec. 105. (a) The Icssec shall make such provisions for the
poMd*of%o M disposal of waste, slack, and refuse of the mine, or waste,
puWicop*prSrte sludgc of any washery, that the same shall not be a
BviMuiM. nuisance or obstruction to any stream, right 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.
Deposit lepa- (b) All wastc containinc: practically no coal shall be
deposited separate and apirt from coal for which there
warn. jg jjQ immediate market, and from the waste containing
coal in such proportion that it may be later separated by
washing or other means.
Abandoned Sec. 106. The Icsscc shall dunng the term of the lease
to'bTcoweS! and before abandonment substantially fence, fill in, cover,
traced. ®'or close all surface openings, subsidence holes or workings
where persons or animals are likely to be injured by fafling therein, or be endangered by 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 nqn£mente!'*25 men are employed on jany 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 bathmg arrangements, such as showers or tubs with ample supply of hot and cold water of proper quality, proper drains and sewage disposal, and sanitary lockers and hangers: ProvidedyThsit at mines where it is not possible at reasonable expense to secure ample supply of water, tubs for bathing purposes will suffice, provided each employee is furnishea at least 5 gallons of water per shift worked imtil such time as sufficient water can oe obtained at a reasonable expenditure. Dweiiinffs for Sec. 108. (a) A Icsscc employing 25 or more men in mines S?feTii std' and stripping operations shall provide adequate quarters tary eonditijn qj. places of aoodc within 2 miles of the mine unless transportation is available from a town or village. Dwellings built on the leased land shall be propeny located with reference to sanitary conditions and an adequate supply of pure water shall be provided in proximity to each dwelling.
(b) Facilities shall be provided for the regular collection and disposal in a sanitary manner of garbage and
Duties Of L.Essee. 87
trash and a separate toilet or privy shall be installed for each dwelling, and at least two in the vicinity of the mine entrance.
(c) Unlined pits for privies may only be constructed or thereafter used where and when there are no weUs or openings furnishing water for drinking or domestic use within such distance, or 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 inspec- ..?5f?!£**®"
tion made weekly, by a competent representative, of tiom m mine
toilets, privies, sewage, and garoage-disposal systems onf£?i£. the lease and promptly to correct or require to be corrected defects and insanitary practices. The recommendations of the United States Public Health Service as given in their publications shall be followed in all such matters.
Sec. 109. When there is no public school maintained ®<*;j5Vi,S!ff- Within 2 miles of the village on any lease on which men of employees, with children of school age are employed by the lessee, he shall endeavor to secure the estaolishment 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 employment of a school teacher or school teachers by subscription or otherwise.
Sec. 110. At every working mine or stripping on a lease First-aid box there shall be provided a United States Bureau of Mines standard first-aid box and its equipment, or its equivalent, kept at a convenient place lor emergency use.
Sec. 111. On any leased land or mines in which rethan 25 men are employed, the lessee shall provide for near e£t of bom emeiency first-aid treatment of injuries near the main wuhnrsf-ald exit of the mine or stripping operation, including a first- qHipnt aid room or receiving station for injured persons arranged with heating facilities for cold weather, which shaU be equipped with a United States Bureau of Mines standard first-aid box or cabinet or equivalent, several pairs of splints, a Bureau of Mines resuscitation apparatus or eqmvalent with its oxygen bottle kept filled ; and there shaU always be on hand at least one fully charged oxygen tank, two stretchers or hospital cots, four pairs of clean blankets 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 facilities kept in a sanitary condition.
Sec. 112. (a) The lessee shall also provide for every First-aid and separate mine in which more than 25 men are employed "iS?8hiS?* underground on any shift a refuge and first-aid chamber bottom, underground either near the foot of one of the shafts, if any, or at whatever point injured persons would most
38 Operating Regulations For 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 tne landing which serves the largest group of men. In the case of a drift mine, the location shsal be at a suitable point, such as the junction of the principal branch haulage ways.
(b) The refuge and first-aid chamber shall be not less than 6J feet high, 8 feet wide in the clear, and 20 feet long, kept whitewashed and free from dirt, and provided with a tight-fitting door. The first-aid room shall not be used for other than refuge or first-aid purposes nor entered otherwise except for inspection, repairs, and renewals, equipment chamber shall be equipped with a first-aid box derground. or cabinet or equivalent, Bureau of Mines resuscitation
apparatus or equivalent, with oxygen bottle kept filled, 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 rire-flMingbiS a total of 10 gallons capacity, a 10-yard roll of orexpiosionem- clean brattice cloth, and a keg of nails, ana a copy of pUelTuiid'er' the latest mine map shall be fastened on a side of the ground. chamber. Where practicable the foreman's office shall
be placed immediately adjacent to the refuse and firstaid room so the latter may be under supervision, trainui'*"*** Sec. 113. At every mine or stripping in which more than 25 men are employed on any snift, the lessee shall
require his mine officials to be trained in first-aid methods when the United vStates Bureau of Mines can furnish instructors to give such training, and shall provide facilities and encourage the training of any or all employees in first-aid methods. Reporting ao- Sec. 114. A report in writing shall be made of each Sg*raper8OTf " accident that results in the loss of more than one shift
for the injured person. These reports, giving name, age, and occupation of injured person, the date, name of mine, and place, with outline sketches or maps when pertinent, the cause, actual work being performed when injured, nature or result of injury, and probable length of disability, shall be made promptly to the district mining supervisor. Where reports embodying the above information are made to the respective State inspector or industrial commission, copies of such reports and outline sketches or maps will fulfill the requirements of this section, contagious and Sec. 115. All coutagious discascs in or about the lease, well as cases of occupational disease known to the lessee which result from or are aggravated by the particular work, shall be reported to the district mining supervisor. Reporting Sec. 116. The Icssee shall report promptly to the disdaftomjiwsf trict mining supervisor by telephone or telegraph the
Duties Of Lessee. 39
oeeurrence in or about the lease of fatal accidents, serious outbursts of eaS) explosions, inundations, extensile squeezes or collapses of roof, or other serious conditions threatening the loss of life or property.
vS'£C. 117. At mines in which oyer 200 men are em- snfine-hovM ployed underground on any shift, the building or build- piJiJ TOaJtnw mgs containing the hoisting engine and power plant shall not have floors, ceiling, and side walls or roof constructed of combustible matenal, but may employ wood for sidewall studs or frames if covered on both sides by noncombustible material and may use wood for roof trusses, purlins, and rafters.
Sec. 118. In every mine where there are or are designed Fireproofinf to be 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 or stratum is combustiole, be fireproof ed within six mont£ after completion, by lining, uniting, or coating with cement or other noncombustible material all combustible material except guides, ladderways, and stairways, and such fireproofing shall be maintained as long as said shafts form the principal means of egress.
Sec. 119. In every mine where there are or are designed PaiMsewayf to be employed more than 200 men underground on any uV Vo "beirJshift, the roof and walls of entries and passageways within poottd 200 feet of the bottom of each of the two principal means egress shall, if lined or timbered with wood, have such wood fireproofed by coating with cement or equivalent within one year after said passageways have been driven, and such fireproofing shall be mamtained so long as said passageways are used.
Sec. 120. On any leased land where over 50 men are Kedioai and employed, and where there is no available physician or iMTioe. suieon whose headquarters is within such distance from the mine or stripping that the journey can be made within one. hour's time, the lessee shall arrange for medical and surgical attendance for its employees, their families and dependents, on the lease at designated times.
Sec. 121. (a) On any leased land on which more than Hospital to 100 men are employed, if there is no State, county, city, or JJjStainefil
[earth Service within 50 miles by railroatl or within 15
miles by well-maintained private or public highways, and suitable ambulance is available, the lessee shall erect and equip and maintain a hospital at a convenient place on tne 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 Ambniaaoo available for use on notice when the hospital is over one-tobeprotided. half of a mile from the mine;
(c) Provide for medical and surgical service for the employees and their families, the employees paying on
40 Operating Regulations For Coal Mines.
any prearranged basis satisfactory to a majority of em*
plovees the actual cost of such service, but not more;
irursefem- (d) Provide on the request of a majority of employees,
qaestedby em- rises and attendants for surgical and medical treat-
pioyeei. 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
affecting the families or dependants of employees;
mSiciaandi- (®) nursing, surgical, and medical service shall
ficaisarricefnr- be fumished by the lessee to employees at cost, including
i?at salaries, wages, and supplies, but repairs and renewals
of buildings and equipment shall be fumished 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 charges may be collected
from employees as a condition of their employment fully
understood and acknowledged : Provided,
Hospital serr- (f) That wheu a suitable hospital is erected within 15
by?r?8*uiniles by a good road as stated above, by State, county,
town, or cooperative or private hospital, with
adequate accommodations approved by the United
States Public Health Service and available for the
employees of the lessee, the lessee may be relieved of his
obhgation 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.
Mino-resone Sec. 122. At every mine in which more than 100 persons
f 8f*at'*in\*ne are employed underground on any shift, the lessee shall
3l?'iM?V,.! have kept and maintained at the mine in order, ready for
employed un-use, m an adequate room provided for the purpose, five
dervroiud. oxygen or self-contained breathing apparatus of a
kind approved by the United States Bureau of Mmes,
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 numoer of persons employed
Five additioxud underground on any shift exceeds 200, five additional
{hinrnTe'Ssets of breathing apparatus with the corresponding ad-
dMffroan<L itioual supplics shall be kept and maintained.
(b) The said five additional sets of breathing apparatus
Additional sets specified in the preceding subsection will not be required
cooperaSSa*e£ if the Icsscc cooDcrates with a neighboring mine or indus
ottutt* optor works in tne estabUshment of a joint rescue station
or Joint rescue which shall be withiu a distance of one hour's journey
taine' by rail or vehicle from the mine on the leased land: Pro-
vided, That said joint station is connected by telephone
line and has an equipment of five sets oj breathing
apparatus of a kind approved by the United States
Bureau of Mines, and witn adequate supplies for use in
emergency: And further provided, That said joint station
shall rave a hand car or motor car for transporting by
rail, if locomotive is not available, or shall have vehicle
equipment for transporting by road, the apparatus and
Duties Of Lessee. 41
supplies to the mine on the leased land within one hour's time of notice of disaster or threatened disaster.
Sec. 124. The lessee shall arrange, in cooperation with t/|[m*foVmed the United States Bureau of Mines, for the training of trained, employees m methods of admmistering 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 ofiicials, for every 100 men employed underground 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 apparatus in a smoke or gas chamber for a total of at least two hours in every two months.
Sec. 125. Where more than 300 men are employed where more underground on any shift, a foreman of rescue an first *mSioy?ru"f. aid shall be employed who shall devote his working time to keeping rescue and first-aid equipment in condition and iirst for use and to training men in first-aid and rescue methods : Syedl Providedj 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 committee ronnation of at each mine or Stripping in which more than 25 men are iit?e'S*?.c'om: employed, 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.
Sec. 127. (a) The lessee shall accurately weigh or Lessee to keep measure and truly account for the coal mined and loaded SSS weight of their output or upon the basis of the measure- and loaded by 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 miners and other interested persons; and shall,
(b) Require the weighman or person appointed to,
weigh or measure the coal where the miners 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 measure 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 herein shall be construed prevent the lessee, in case bone coal or other impurities of rock, bone, or are loaded by the miner with the coal, from estimating orcJSl separately weighing and deducting the amount thereof
42 OPEEATING REOtJLiTIOHS FOK COAL MINES.
from the weights of coal accredited to the mmer or
miners. ootrJot witJ (d) In mines or working places when it is difficult or !®"**i!" impossible on account of natural conditions to excavate oATation made the coal free from rock or other mipunties, or m mmes where weighing scales have not been installed, nothing Leiiee shall be construed to prevent the lessee from ooatract on entering into contract with the miner for miners to yardage baiia jjeasurc the coal mined and removed by measm*ement
of the excavation thus made, or from contracting witi
the employee to pay on the basis of the feet or yards of
advance of the working place. Sec. 128. The administration of these relations shall
be mider the direction of the Bm'eau of Mmes.
Approved, April 30, 1921.
Albert B. Fall,
Secretary.
Index.
A.
Sections.
ABANDONED areas in mine when not ventilated, stoppings required 6
surlace openings of holes to be filled in or fenced 106
ABANDONMENT of mined or unmined portions, conditions determined by supervisors . . . 6
ADVANCE EXTRACTION ofcoal 18e
AMBULANCE provided 121b
ANTHRACITE, definition. See Coal.
APPARATUS and machinery mspection, defect remedied before further use 28b
APPEAL from supervisor's orders to Secretary of Interior 4,7
B.
BARRIER pillars, boundary 98
BATH and change bouse rejuirements 107
BLACK powder, black blastmg powder when used shall be fired electrically from surface ch* by shot
flyers 86c
BLASTING, black powder, making up charge 90a
drill hole, depth and other limitations 88
electrical firing from surface 86c
misfires, record of 91
open light not permitted within 5 feet when filling or preparing chaise 90b
powder box , location of miners' 82
shooting in gaseous mine onlv after safetv lamp test, showing less than 2 per cent fire damp 86b
stemming with noncombustible material 89
storing explosives in powder box 82
BOILER INSPECTION 28a
BORE HOLES to be drilled to relieve gas accumulations 52b
when approaching abandoned workings 5
BOUNDARY barrier pillars 76c, d
BUILDINOS of inflammable material not to be placed within 75 feet of any mine, exceptions 17
BUCKETS, shaft sinking , 24
CHANGE HOUSE and bath requirements 107
COAL, anthracite, definition page 3
bituminous, definition page 3
cannel , definition page 3
extraction on advance mining 96
lignite page 3
semianthracite, definition page 3
semibituminous, definition page 3
subbituminous, definition page 3
wasted, ascertaining damages by supervisors 3, 4
COAL DUST, analysis of 74e,g
barriers shall be erected in dry districts or panels 74h
cleaning up accumulations of 74d
dry method of treatment 74g
mine cars shall be tiht to prevent leakage of dust 74o
prevention of explosion 74a, b, c, d, e, f , g, h
rock or shale dust methods 74g
sampling and analysis of 74g
screening and loading of 74b
tight 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-throughs, 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 61a
DEFINITIONS pages 3,4
DEPTH of coal bed, limiting amount of coal removed by advance workings 95
DEPUTY mining supervisor, definition page 3
DERAILS or stop blocks on top of slope or incline 103a
DETONATORS, or blasting caps containers for. requirement:, of 83
caps. See Explosives.
DEVELOPMENT from adjoining mine 7Sft,b
of mines 75a
DISASTERS must be promptly reported by lessee 116
OPKRaTINQ ItEOULATIONS FOB COAL MINBS.
DISBASES, contagloas and ooouiiatloaaL reported...
Drill Holes,
DWELLINOSofeinplojeea to be lepC In BUltaTf condition...
tioller win placMOent and Euuda. .
underground clwtrical stallona. . ,
volCsM clttsaiflcatlons
voltage troilcy line and other machlnary. . .
wunlng slenals lor bleb voitaie
EUERQct nippUu Im fli
BNQINE house andp '
ENTRY or level, deSn
EBCAPK WAVa, second exit or mi „
ETHANE, definition
EXITS to nir&ce,sea)i]d exit, ocsMape way to be provided, diatonce api EZPL08IO.SS reported br lessee
report to mining superviair
EIPL08IVEa,amoimt minora may bsveln mine
black powder sball be Sred elactilcally Irom surtace at by shot Erers . . .
I except by openJnK pr
dneis' supply kept in powder box. onpennisble, coodltioos of use...
record of mlsflrea. . .
Bentioto mine, distributed promptly
shots ahaJl be Hrad In gaseoua mine iraly alter safety lamp 1 sbots shall bestoramed with DOncomtnistlLla material
temporary storage underground... thawing. - . thawing hi
trasspttftation In electrlcaUy equipped mines
transportation in miite wh eietcity used as sou
underraound transportation in bulk
EXTRACTION OF COAL by advanced workings .. .
FAN, adjidnine mine, usaolbn
booster Ian In noogeseous mine
booster Ian, recirculation ofairlimiled...
.t-a*
Bouhp
Apr 27 1940
UNW. Of MifMt UBRABK
University Of Michigan
f