Analytical results, geochemical signatures, mineralogical data, and sample locality map of placer gold and heavy-mineral concentrates from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska

McDanal, S.K., Cathrall, J. B., Mosier, E. L., Antweiler, J.C. · 1988 · Report

Geochemical studies of Alaskan gold deposits were begun in 1984 as a joint study by the U.S. Geological Survey and the State of Alaska Division of Geological

This 1988 document, Analytical results, geochemical signatures, mineralogical data, and sample locality map of placer gold and heavy-mineral concentrates from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska, is preserved in the Mountain Man Mining Library for research and reference. Original source: pubs.usgs.gov.

UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Analytical results, geochemical signatures, mineralogical data, and sample locality map of placer gold and heavy-mineral concentrates from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska By Steven K. McDanal, John B. Cathrall, Elwin L. Hosier, John C. Antweiler, and Richard B. Tripp Open-File Report 88-443 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS.

CONTENTS Page Introduction Sampling and Analytical Procedure Reliability of Gold Analyses Description of Data Tables Other Publications References Cited ILLUSTRATIONS Figure 1. Localities of samples from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska TABLES Table 1. Locality index for placer gold from the Manley Hot Springs, Tofty, Eureka, and Rampart mining district, Tanana and Livengood quadrangles, Alaska Table 2. Signatures of placer gold from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska Table 3. Spectrographic analyses for the nonmagnetic fraction of the heavy-mineral-concentrate samples from placer gold samples from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska 51 Table 4. Binocular microscope mineralogy of the nonmagnetic fraction of the heavy-mineral-concentrate samples from placer gold samples from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska 54

INTRODUCTION Geochemical studies of Alaskan gold deposits were begun in 1984 as a joint study by the U.S. Geological Survey and the State of Alaska Division of Geological and Geophysical Surveys. The objectives of the study are (1) to characterize the deposits, (2) to determine relationships of gold in placer deposits to possible lode sources, (3) to identify possible sources of gold in placer deposits, (4) to study processes of placer formation, (5) to contribute to existing knowledge of the principles of prospecting for placer deposits, and (6) to determine if minerals associated with placer deposits might suggest economic deposits of other metals. The purpose of this report is to release both the analytical data and gold signatures for placer gold and also the analytical data and mineralogy of the nonmagnetic fraction of the heavymineral-concentrate samples from placer gold samples. Gold signatures comprise the alloy proportions and ratios of gold, silver, and copper, and the content of trace elements (Antweiler and Campbell, 1976). SAMPLING AND ANALYTICAL PROCEDURE Placer gold samples and associated heavy-mineral concentrates from stream-sediment samples were obtained from most of the active claims in the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts. At some localities, miners very generously provided us with ample amounts of gold for analysis. To determine whether differences in composition could be correlated with physical attributes, these samples were handled in various ways. Some were sieved into two or more size ranges; others were separated by color; and some were separated on the basis of physical characteristics, e.g., rounded, angular, blocky, delicate, etc. Self-explanatory, descriptive information is included in the analytical tables. Where no descriptive information is provided, the samples were generally small, and no sorting of individual grains was attempted prior to analysis. A total of 404 emission spectrographic analyses using a technique described by Hosier (1975) were made on placer gold (table 1) from 45 mines and prospects. These are the numbered sites on the sample location map (fig. 1) and correspond to the locality index (table 1). Spectrographic results were obtained by visual comparison of spectra derived from the sample against spectra obtained from standards made from pure oxides, graphite, and 99.999 percent metallic gold. Pure AOo was added to the standards and samples as a codistillation agent. Standard concentrations are geometrically spaced over any given order of magnitude of concentration as follows: 100, 50, 20, 10, and so forth. Samples whose concentrations are estimated to fall between those values are assigned values of 70, 30, 15, and so forth. Standard concentrations are based on a 5-mg gold sample weight. Because of the nature of native gold, it is often difficult to weigh exact 5-mg samples and in many incidences there is less than 5-mg of gold available for analysis. Therefore, the reported concentration values (table 2) are corrected to reflect a 5-mg sample weight by the following formula: reported concentration value determined value x sample weight

150°30' 150°00' 65°30' EXPLANATION .7 Locality where samples were collected. Numbers keyed to tables 1-3. See table 1 for locality index. ro RAMPART DISTRICT EUREKA, TOFTY, AND MANLEY HOT SPRINGS DISTRICTS! Manley Hot Spring MANLEY HOT -SPRINGS 151°30' 65' 15 65°00' 151*30' 151*00' 150*30' 1 5 0 0' Figure 1. Locafties of samples from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska

The trace-element content of natural gold varies greatly from grain to grain as well as from deposit to deposit and this creates a problem in determining the precision of the analytical technique. However, studies using artificial melts show that the precision of the analytical method far exceeds the natural variance of trace elements in native gold (Hosier, 1975). Heavy-mineral-concentrate samples were obtained at most sites by wetsieving stream sediment through a stainless-steel screen with a mesh opening of 2 mm into a 14-in steel gold pan and by panning the minus-10-mesh material. In the laboratory, the panned concentrate was air dried and sieved through a 30-mesh (0.8-mm) sieve to remove most of the rock-forming minerals. The minus-30-mesh fraction was further separated using bromoform to remove the remaining minerals of a specific gravity less than 2.85. A nonmagnetic fraction of each sample was obtained using a Frantz Electromagnetic Separator with equivalent settings of 0.7 ampere and track settings of 5° forward slope and 10° side tilt. Relatively nonmagnetic fractions free of the dilutant minerals, magnetic iron oxides, garnet, amphibole, pyroxene, epidote, and other high-iron/low magnesium silicates were obtained by this procedure. The nonmagnetic fraction of the heavy-mineral-concentrate samples were analyzed for 31 elements (table 3) using a semiquantitative, direct-current arc emission spectrographic method (Grimes and Marranzino, 1968). As with the analytical method for gold, spectrographic results were obtained by visual comparison of spectra derived from sample against spectra obtained from standards made from pure oxides and carbonates with the same geometrical spacing of concentrations. The precision of the analytical method for the nonmagnetic fraction is approximately plus or minus one reporting interval at the 83 percent confidence level and plus or minus two reporting intervals at the 96 percent confidence level (Motooka and Grimes, 1976). The nonmagnetic heavy-mineral fraction was scanned visually using a binocular microscope and shortwave ultraviolet light to identify ore-related minerals (table 4). In most cases, the mineral grains could be identified from their physical properties, but x-ray diffraction was used to confirm some species. This visual examination is an important supplement to the spectrographic analyses because the particulate nature of this sample medium poses problems for both the sample preparer and the analyst. A 5-mg split of finely pulverized sample is normally used for the spectrographic analysis, consequently, malleable minerals such as gold, silver, and copper may be poorly represented in the sample. Another benefit of the visual examination is identifying artifacts such as bullet and solder fragments, wire, or other man-made contaminants. It is useful to be aware of these contaminants as they can give inflated values of the ore-related elements in the spectrographic results. The mineralogical data for the heavy-mineral-concentrate samples is found in table 4. RELIABILITY OF GOLD ANALYSES Differences in the composition of native gold from different geological settings can readily be distinguished using the analytical procedure mentioned above if enough analyses are made to ascertain the magnitude of natural variations in gold samples. In this study five or more spectrographic analyses were found desirable for a single sample site to obtain a signature in which one can place confidence. However, in the context of many other analyses from this district, a single analysis is of value, and three analyses at a sample site are enough.

The composition of native gold varies considerably (for example, see Gay, 1963; Jones and Fleischer, 1969). Variations in composition are present even from point to point within the same grain (Desborough, 1970). Native gold in oxidized zones and in associated placers generally contains lesser amounts of silver and other elements compared with the native gold in the corresponding primary deposits; within some specific deposits, single particles of native gold are relatively homogeneous, but in other deposits the native gold is heterogeneous (Boyle, 1979). Because variations in gold composition are natural rather than analytical, they are worthy of study, particularly so their significance can be understood. In spite of the variations, gold compositional data are useful in that they help characterize conditions of ore deposition and are commonly locally distinctive for mines, districts, or regions. Moreover, they are useful in determining the relationships of gold in placer deposits to possible lode sources, and in meeting the other objectives stated in the introductory section of this report. The natural variability of analyses for Ag and Cu in gold from a single locality was determined by repeatedly analyzing portions of single nuggets (Hosier, 1975; Antweiler and Campbell, 1987). They found silver content of one such nugget ranged from 4.7 to 8.1 percent in four analyses with a standard deviation of ±1.6 percent and the copper content of this nugget ranged from .048 to .08 percent with a standard deviation of ±.0144 percent. Replicate analyses of portions of another nugget from the same locality showed silver content of 18.9 to 19.8 percent with a standard deviation of ±0.56 percent and copper content .038 to .055 percent with a standard deviation of ±.012 percent. Such analytical results indicated considerable natural variability. Another nugget from the same locality was washed with hydrofluoric acid to remove surface coatings, then heated to 1300 °C for 30 minutes to homogenize silver and copper content. Analysis of ten 5-mg portions of that nugget each time showed excellent precision; 10 percent silver, (S.D.=0) and 0.05 percent copper (S.D.=0). Prior to acid washing and heat treating, ten 5-mg portions ranged in silver content from 1.5 to 15 percent and in copper content from .015 to .05 percent indicating their natural variation (Hosier, 1975). The concentration of other elements in nuggets from the locality ranged somewhat more widely than copper and silver, even after the homogenization treatment. Significantly, however, the mean values for most elements, including copper and silver, were almost the same on 10 analyses of the natural sample as the mean values for those elements on the homogenized sample, except for elements removed by the acid and heat treatment. Accuracy is much more difficult to determine than precision because homogeneous gold samples with known amounts of impurities are not readily available. However, standards prepared with known amounts of copper and silver show the method to be accurate within a factor of two in determination of those elements (Hosier, 1975). One test for reliability of the method is comparison of fineness on samples from localities where large lots of gold have been analyzed for the U.S. Hint or by banks or commercial refiners who have purchased gold. Compilations of gold fineness data have been made by Smith (1941) and by Hetz and Hawkins (1981). Also, the First National Bank in Fairbanks made available to us records of gold purchases from 1903 to 1937 from many Alaskan placer deposits. These compilations show excellent agreement for some areas with each other, and poor agreement in other areas. The U.S. Geological Survey data, although acquired by analyses of relatively small samples, agree as well as the data from those sources and are therefore reliable only to the extent permitted by natural variation of gold composition.

DESCRIPTION OF DATA TABLES The analytical results for placer gold (table 2) are given in weight percent and are presented by localities. The USGS-assigned sample number is given under sample. When sufficient gold was available from a particular site, multiple analyses were made and the results are listed. For this study, fineness is defined as: fineness x 1,000 . Au + Ag The gold value was determined by difference, that is: 100- (Ag* + X%), where X£ is the sum of elements other than gold and silver. If an element was not detected at the lower limit of detection, a .0 was entered. The actual weight in milligrams of the gold sample analyzed is given under smpl wt. The values under r Au/Ag, Au/Cu, Ag/Cu, and r/Cu are self-explanatory alloy ratios that are part of the gold signature (Antweiler and Campbell, 1976). Because the corrected values shown in table 2 are computer-generated data, these results often carry more digits than are significant. The analysts did not determine these values to the accuracy suggested by the extra numbers. Table 3 lists the results of the analyses for the nonmagnetic fraction of the heavy-mineral-concentrate samples and are presented by localities. No analytical data on heavy-mineral concentrates were obtained from sites 8, 18, 19, 39, 44, and 45. Values determined for the major elements (iron, magnesium, calcium, and titanium) are given in weight percent; all others are given in parts per million (micrograms/gram) . The USGS-assigned sample number corresponds to the placer gold assigned number. Table 4 shows the mineralogical results of the nonmagnetic heavy-mineralconcentrate samples. No mineralogical data were obtained from sites 8, 18, 19, 39, 44, and 45. The percentages determined for the pyrite and scheelite are strictly eyeball estimates as seen in the microscope field under 20X magnification and do not reflect actual grain counts. If a mineral species was observed in the sample and determined to be less than 1% by volume of the total nonmagnetic sample, an "X" is used. Table 4 indicates only those minerals we feel may be ore-related and does not show extraneous minerals such as apatite, sphene, zircon, etc., most of which appeared in all samples. OTHER PUBLICATIONS Other U.S. Geological Survey publications showing principally analytical results, geochemical signatures, mineralogical data, and sample locality maps of placer/lode gold and heavy-mineral concentrates from other gold mining districts in Alaska are: Hosier, E.L., and Lewis, J.S., 1986, Analytical results, geochemical signatures, and sample locality map of lode gold, placer gold, and heavy-mineral concentrates from the Koykuk-Chandalar mining district, Alaska: U.S. Geological Survey Open-File Report 86-345, 172 p., 1 pi. Cathrall, J.B., Antweiler, J.C., and Hosier, E.L., 1987, Occurrence of platinum in gold samples from the Tolovana and Rampart mining districts, Levengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 87-330, 12 pages, 1 pi.

REFERENCES CITED Antweiler, J.C., and Campbell, W.L., 1976, Application of gold compositional analysis to mineral exploration in the United States [abs.]: 25th International Geological Congress, Sydney, Australia, v. 2. p. 433-434. Antweiler, J.C., and Campbell, W.L., 1987, Implications of the Compositions of lode and placer gold, in Theodore, T.G., Blair, W.N., and Nash, J.T., Geology and Gold Mineralization of the Gold Basin-Lost Basin Mining Districts, Mohave County, Arizona: U.S. Geological Survey Professional Paper 1361, p. 100-109. Boyle, R.W., 1979, The geology of gold and its deposits: Geological Survey of Canada Bulletin 280, 584 p. Desborough, G.A., 1970, Silver depletion indicated by microanalyses of gold from placer occurrences, Western United States: Economic Geology, v. 65, no. 3, p. 304-311. Gay, N.C., 1963, A review of geochemical characteristics of gold in ore deposits: University of Witwatersrand, Economical Geological Research Unit Information Circular 12, 70 p. Grimes, D.J., and Marranzino, A.P., 1968, Direct-current arc and alternatingcurrent spark emission spectrographic field methods for the semiquantitative analysis of geologic materials: U.S. Geological Survey Circular 591, 6 p. Jones, R.S., and Fleischer, Michael, 1969, Gold in minerals and the composition of native gold: U.S. Geological Survey Circular 612, 17 p. Metz, Paul A., and Hawkins, D.B., 1981, A summary of gold fineness values for Alaska Placer deposits: School of Mineral Industry, University of Alaska, Fairbanks, Alaska 99701, MIRL Report 45. Mosier, E.L., 1975, Use of emission spectroscopy for the semiquantitative analysis of trace elements and silver in native gold, in F.N. Ward, ed., New and refined methods of trace analysis useful in geochemical exploration: U.S. Geological Survey Bulletin 1408, p. 97-105. Motooka, J.M., and Grimes, D.J., 1976, Analytical precision of one-sixth order semiquantitative spectrographic analyses: U.S. Geological Survey Circular 738, 25 p. Smith, P.S., 1941, Fineness of gold from Alaska placers: U.S. Geological Survey Bulletin 910-C, p. 147-272.

Table 1. Locality index for placer gold from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska Boulder Creek, Bench #4 Boulder Creek, Bench #2 3. Boulder Creek, Bench #1 Colorado Creek* 27, 5. American Creek New York Gulch Woodchopper Creek, upper 8. Woodchopper Creek, lower 30, 9. Miller Gulch* Tofty Gulch* 31, 11. Cache Creek 32, Blowback Creek 33, 13. Cooney Creek 34, 14. Thanksgiving Creek 35, 15. Omega Creek, lower 16. Omega Creek, upper Rhode Island Creek, upper 38, 18. Glenn Creek* Rhode Island Creek, middle 20. Bench between Rhode Island-Glenn 41, Creeks* 21. Rhode Island Creek, lower 22. Bench between Glenn-Eureka Creeks Eureka Creek, below Pioneer Creek, #1 45. Eureka Creek, below Pioneer Creek, #2

Alameda Creek Eureka Creek, above American Creek Eureka Creek, Bench, above American Creek' Eureka Creek, above Boston Creek, below

Unanimus Creek Boston Creek Eureka Creek, above Pioneer Creek, below Boston Creek What Cheer Bar* Pioneer Creek, bench at Doric Creek Seattle Creek, Jr. Skookum Creek North Fork Pioneer Creek Slate Creek, #1 Ruby Creek, #1 Ruby Creek, #2 Hoosier Creek, #1 Hunter Creek, #1 Hunter Creek, #2 Hunter Creek, below Dawson Creek Hunter Creek, above Dawson Creek Gunnison Creek Quail Creek Geographic name is on 1:63,360 scale map but is not on this map.

Table 2. Signatures of placer gold from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Llvengood quadrangles, Alaska Au [Fineness Au+Ag x 1000; x sum of elements other than gold and silver; smpl wt, gold (Au) sample weight 1n milligrams analyzed; all element and X values given 1n percent.] Hq CO Sample 3209A 3209R 3208A 3208B 320SC 3207A 3207B 32H7C 3203A 3203B 3203D 3204B 3204D 3205A 3205B 3205D 3206A 3206B 3029A 3029B 3029D 3029F 3G29XA 3029XB 3C29XE Au Fineness 825' Ag SUM of X Cu Zn Poulder Creek Ga Bench #4 Pb As unsorted Sb Cd Bi Te Boulder Creek, Boulder Creek, Colorado American ft. New York Woodchopper Creek Bench Bench Creek! Creek? Gulch; , upper #2? unsorted #i; unsorted unsorted unsorted unsorted 5 minus 35-mesh Woodchopper Creek, upper! plus 35-mesh 1 .014? Ki ,0026 ,0 ,0 ,0051 ,0006 ,0 ,0075 ,0189 ,0 ,0 ,0 ,0005 ,0007

Table 2. Signatures of placer gold from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Uvengood quadrangles, Alaska All I Fineness Au+Ag x 1000; x sum of elements other than gold and silver; smpl wt, gold (Au) sample weight 1n milligrams analyzed; all element and X values given in percent.] Sample 3209A 3209P Au Fineness Ag SUM of X Cu Zn Poulder Creek, Ga Bench Pb As Sb Cd Bi Ha Te Ni #4; unsorted 3208A 3208P 320RC 3207ft 3207B 32H7C 3203A 3203B 3203D 3204B 3204D 3205A 3205B 3205D 3206A 3206B 3029A 3029B 3029D 3029F 3G29XA 3029XB 3C29XF Poulder Creek, Boulder Creek, Colorado American New York Woodchopper Creek Bench Bench Creek? Creek? Gulch? , upper #2? unsorted #1? unsorted unsorted unsorted unsorted ? minus 35-mesh . o Woodchopper Creek, upper! plus 35-mesh 1 .014? ,0636 ,8883 ,3099 ,8274 ,0 ,0006 ,0 ,0189 ,0 ,0007

Table 2 --Continued 3209A 3209B 3208A 3208B 320PC 3207A 3207B 3203A 3203B 3203D 3 2 0 4 B 3204D 3205A 3205B 3205D 3206A 3206P 3G29A 3029B 3029D 3029F. 3029XA 3029XP 3029XK Co ,0021 ,0 ,0 ,0 ,0 ,0 ,0 ,0014 ,0 ,0 ,0 ,0 Ge

Pt Boulder Boulder Boulder Pd Creek, Creek, Creek, Colorado

American

t , ,

New Woodchopper York Creek Ba Bench Bench Bench Creek! Creek ; Gulch ? , upper . o Sr Zr #4? unsorted

#1! unsorted unsorted unsorted unsorted ? minus Woodchopper Creek, upper? plus ,

Cr Y --Continued ,

--Continued

--Continued ,

--Contin ued

t , ,

Continued

--Continued ,

35-mesh , ,

-mesh ,

--Continued . o --Continued La Nb ,0021 ,0015

Table 2 Continued 3209A 3209B 3PP9C 3208A 3208R 3207A 3207B 3203A 3203B 3203D 3204B 32Q4I) 3205A 3205B 3205D 3206A 3206B 3029A 3029B 3029D 3029E 3029XA 3029XB 3029XE Ta Pe Mn Fe Ma Ca Ti Si smpl wt r=Au/Ao Boulder Creek, Bench #4; unsorted --Continued Au/Cu Ag/Cu r/Cu Boulder Creek, Bench #2? unsorted --Continued ,0018 Boulder Creek, Bench #1? unsorted --Continued ,0001 ,0003 ,0047 ,0014 ,0001 ,0002 Colorado Creek? unsorted Continued American Creek? unsorted Continued ,5342 ,2049 ,4717 ,0053 ,0 ,0047 New York Gulch? unsorted Continued ,0179 ,1969 ,0152 ,0281 ,4762 ,0490 ,0134 ,1969 ,0508 ,2R09 ,6667 ,0980 Woodchopper Creek, upper? minus 35-mesh --Continued ,0952 ,0723 ,1053 ,3043 Woodchopper Creek, upper? plus 35-mesh --Continued ,0636 ,2538 ,2066 ,2364 4,696 6,650 10,84? 2,861 9,716 3,556 4,107 3,893 7,095 8,525 3,847 6,511 7,232 7,129 3,886 11,548 6,111 4,043 8,049 7,857 5,330 12,032 1,122 2,000 2,857 1,000 1,000 1,000 2,000 1,500 1,500 3,000 2,000 3,000 1,000 2,143 1,500 1,500 1,133 3,500 1,092.1

Table 2 --Continued Sample 3167A 3167B 3167XA 3167XB 3167RA 3167RP 31f7PC 3211A 3211B 3211XA 3211XB 3031A 3031B 3031D 3031XA 3031XB 3031XD 3031XK 3288A 3 2 R 8 B 3?88C 3288FA Au P4 .6 Fineness Ag SUM of X CU Woodchopper Woodchopper Woodchopper Creek, Zn Creek, Creek lower Ga lower ; , lower ; plus Pb minus ; plus 20-mesh As 20-mesh 20-mesh ? flat Sb orains ( Cd Bi Miller Gulch! unsorted Tofty GulchJ minus 20-mesh! amalqam Tofty Gulch J plus Cache Creek? Cache Creek; Blowback Creek; minus 20 -mesh ; amalgam minus 35-mesh plus 35-mesh 20-iresh, plus 6 0-mesh Hq Te .185? Ni ,0064 ,0 ,0008 ,0 ,0010 ,0 ,0 ,0 ,0008

Table 2 Continued CO Sample 3167A 3167R 3167XA 3167XP 3167RA 3167RB 3167RC 3211A 3211B 3211XA 3211XB 3031A 3031R 3031D 3031XA 3031XP 3031XD 3031XE 3288A 3T88B 32B8FA Co Sn ,0009 ,0 ,0 Mo Ge Pt Woodchopper Woodchopper Woodchopper Creek, Pd Creek, Creek, lower! Ba lower ? lower plus Sr minus ! plus 20-mesh Zr 20-mesh 20-mesh ? flat Cr -Continued -Continued Y grains --Continued Miller Gulch! unsorted --Continued Tofty Gulch! minus 20-mesh! amalgam --Continued Tofty Gulch! plus Cache Creek!

Blowback Cache Creek ! Creek! minus 20-mesh! amalgam --Continued minus plus 35-mesh 35-mesh 20-mesh, plus --Continued --Continued 60-mesh Continued La Sc Kb ,0 ,0 ,0 R004

Table 2 --Continued Sample Ta Be Mn Fe Mg Ca Ti smpl wt r=Au/Ag Au/Cu Ag/Cu r/Cu Woodchopper Creek, lower? minus 20-mesh --Continued 3167A 3167B 3167P 3167XA 3167XB 3167RA 3167RB 3167RC 3211A 3211B 3211XA 3211XB 3031A 3031B 3031XA 3031XF 3031XP 3031XE 3288A 3288B 3PK8FA Woodchopper Woodchopper Creek , Creek, lower? lower! plus plus 20-mesh 20-mesh ? flat 15,465 3,428 ,000 ,500 --Continued grains Continued 42,718 1,796 9,324 5,212 8,140 ,000 ,286 ,000 ,500 2,366.6 12, Miller Gulch} unsorted --Continued Tofty Gulch! minus 20-mesh? amalgam Continued Tofty Gulch ; plus Cache Creek? Blowback .001£ Cache Creek? Creek ? minus 20-mesh ? amalgam --Continued minus 35-mesh --Continued plus 35-mesh --Continued 20-mesh, plus 60-mesh --Continued 4,624 1 ,4?9 19,665 17,064 12,945 14,097 10,551 17,766 24,939 28,719 23,439 26,283 55,946 26,561 13,913 8,823 11,890 6,389 5,547 8,367 8,579 2,000 1,429 4,000 1,429 2,000 10,000 13,500 4,833 6,500 15,667 7,833 3,000 1,850 1,057 1,000 1,000 1,500 1,000 7,053.3 1,733.7 1,385.1 1,865.5 1,396.7 1,347.8 2,571.2 1,180.0 1,465.3 R27.0

Table 2 --Continued 3288F9 3288FC 3288VA 3288VB 3212A 3212B 3212XA 3212XB 3212RA 3212RB 3212RC 3212SA 3212SB 3212SC 3212TA 3212TB 3212TC 3202A 3202B 3202D 3201A 3201B 3C30A 3030B 3030D 3030F Au Fineness R80 Ag SUM of X Cu Zn Ga Pb As Sb Cd Blowback Creek? minus 20-mesh, plus 60-mesh --Continued Bi Hq Te Ni Cooney Creek? minus looney Creek Cooney Creek? minus Cooney Creek? minus Cooney Creek? Thanksgiving Omega Creek , 20-mesh, plus ; plus 60-mesh 20-mesh 60-mesh .000? , plus 100-mesh 100-mesh, plus minus Creek ? lower? 160-mesh unsorted unsorted 160-mesh . 010? Omega Creek, lower? minus 35-mesh 3 .4P03 . n

Table 2 Continued Sa-nple 3288FB 3P88FC 3288VA 3P8RVB 3212A 3212B 3212XA 3212XB 3212RA 3212RB 3212RC 3212SA 3212SR 3212SC 3212TA 3212TB 3212TC 3202A 3202B 3202D 3201A 3P01B 3030A 3030B 3030D 3030F Co Sn Ho ' . 0 "" Ge Pt Pd Ba Sr Zr Cr Y Blowback Creek; minus 20-mesh, plus 60-mesh --Continued Cooney Creek; minus 20-mesh, plus 60-mesh Continued Cooney Creek; plus 20-mesh Continued Cooney Creek? minus 60-mesh, plus 100-mesh Continued Cooney Creek; minus 100-mesh, plus 160-mesh --Continued Cooney Creek? minus 160-mesh --Continued Thanksgiving Creek? unsorted --Continued Omega Creek, lower? unsorted --Continued Omega Creek, lower; minus 35-mesh --Continued La Sc Nb n ,o ,0006 ,0010 n o

Table 2 --Continued Sa mple 3288FE 3288FC 3288VA 3288VP 3212A 3212B 3212XA 3212XB 321PXC 3212RA 3212RB 3212RC 3212SA 3212SB 3212SC 3212TA 3212TP 3212TC 3202A 3202P 3202D 3201A 3201B 3030A 3030B 3030D 3 0 3 0 K Ta Be Mn Fe Mo Ca Ti Si sitipl wt r=Au/Ao Au/Cu fiq/Cu r/Cu 12, Plowback Creek; minus 20-mesh, plus 60-mesh --Continued Cooney ,1479 Creek; minus 20-mesh, Plus 60-mesh Continued Cooney Cooney Cooney Creek 5 plus 20-mesh --Continued Creek; minus 60-mesh, plus 100-mesh --Continued Creek; minus 100-mesh, plus 160-mesh --Continued Cooney Creek! minus 160-mesh --Continued Thanksgiving Creek; unsorted --Continued Omeoa Creek, lower? unsorted --Continued Omeoa Creek, lower? minus 35-mesh --Continued 6,237 5,898 7,344 4,279 23,980 4,984 37,984 11,806 5,869 43,525 16,*15 5,232 10,438 7,631 5,280 15,212 2,661 7,630 11,488 4,092 4,147 8,273 5,182 16,182 15,654 31,463 7,022 35,602 32,464 23,669 1,000 1,000 5,000 7,500 3,000 1,000 IP, 000 3,000 1,000 2,857 1,000 1,000 2,000 1,000 1,429 1,500 1,333 3,000 3,000 9,000 3,857 11,500 9,000 8,33? 1,483.5 2,476.5 2,467.9 1,156.1 1,487.8 1,167.2 1,078.8 1,043.6 1,445.0 1,495.3 1 ,554.6

Table 2 --Continued p. m p 1 e 3C30F 3030XA 3030XR 3030XD 3200A 3200B 32POD 320CXA 3200XB 3?POXC 3200RA 3200PP 3200&C 3200SA 3200SE 3200SC 3200TA 3200TB 3200TC 3198A 3198B 3198P 3?77XA 3277XP 3277ZA 3 P777 P. Au 7*.8 P.I.9 81.* 79.A Fineness 76? 841' SUM of X Cu Zn Ga Pb As Sb 15, Omega Creek, lower? minus 35-mesh --Continued Omega Creek, lower? plus 35-mesh Cd ,0109 Bi Omeoa Onega Omega Creek, upper? minus Omega Creek, upper Creek, upper? minus Creek, upper! minus Omega Creek, upper? Rhode Island Creek, 20-mesh, plus 60 ? plus 20-mesh -mesh 60-nesh, plus 100-nesh 100-mesh, plus 160-nesh minus 100-nesh upper? unsorted Glenn Creek.? plus 20-nesh .001P ,0002 ,0 ,0 ,0 ,0002 ,0070 ,0150 ,0100 ,0500 ,0500 ,0 ,0 ,0002 Hq 3.2f-RO . P . n Ni ,0 ,0 ,0007 ,0010 ,0021 ,0027 ,0005 ,0005 ,0030 ,0 ,0150 ,0029 ,0020 ,0015 POOS

Table 2 Continued Sample 3030F 3030XA 3030XB 3030XD 3200A 3200B 3200D 3200XA 3200XB 3200RA 3200RE 3200RC 3200SA 3200SB 3200SC 3200TA 3200TB 3200TC 3198A 3198B 3198D 3277XA 3277XP 3277ZA 3277ZP, CO Sn ,0 ,0 ,0 ,0020 ,0 ,0 ,0050 ,0300 ,0500 ,1000 ,0010 ,0010 HO Ge Pt Pd Ba Sr Zr Cr Omega Creek, lower? minus 35-mesh --Continued La Sc 16, 16, 16, 15, Omega Creek, lower? plus 35-mesh --Continued

Omega Omega

Omega

,

m

Creek , upper Omega Creek Creek, Creek, Omega Rhode upper ? upper ? Creek, Island ? minus 20-mesh, plus 60-mesh , upper? plus minus 60-mesh 20-mesh

Continued --Continued , plus 100-mesh minus 100-mesh, plus 160-mesh upper? minus Creek, upper? Glenn Creek ? plus 1 00-mesh unsorted --Continued --Continued --Continued --Continued 20-mesh --Continued . o Nb ,0

Table 2 --Continued COo Sa mple 3030F 3C30XA 3030XB 3030XD 3200A 3200B 3200P 3200XA 3200XP 3200RA 3200RB 3200RC 3200SA 3200SB 3200SC 3200TA 3200TB 3200TC 3198A 3198B 3198D 3277XA 3T77XB 3277ZA 3P77ZP Ta Be Hn Fe Mg Ca Ti Si smpl wt r=Au/Ag 16, 16, Omeqa Creek, lower? minus 35-mesh --Continued Omega Creek, lower? plus 35-mesh --Continued Au/Cu 22,509 Ag/Cu 7,000 r/Cu Orceoa Creek , upper Omega Creek Omega Creek, Omega Creek, Omega Rhode upper? upper; Creek , Island ? minus , upper minus minus upper ? Creek, 20-mesh, plus ; plus 60-mesh 20-mesh , plus 1 100-mesh, plus minus upper ? 100-mesh 60-mesh 24,819 15,251 8,791 25,089 17,000 4,200 3,400 6,500 1,232.6 --Continued 5,529 5,115 10,688 8,189 1,000 1,333 2,857 1,500 --Continued 00-mesh 160 -mesh 14,878 11,165 6,223 4,000 2,143 1,000 --Continued 15,871 10,577 7,320 3,000 2,857 2,000 1,058.1 --Continued 3.R 7,623 15,837 2,513 2,000 3,000 1,055.8 --Continued 5,061 5,003 1,000 1,000 unsorted Continued 8,340 2,645 8,662 5,306 1,500 1,000 1,000 Glenn Creek? plus 20-mesh --Continued R4 8,377 4,354 4,195 6,033 5,050 1,500 1,000 1,000 1,373

Table 2 --Continued Sample 3277ZC 3277BA 3277B& 3277A 3277SA 3277SR 3277SC 3277HA 3277HB 3277HC 3277FA 3277FB 3277FC 3277WA 3277WB 3277VA 3277VB 3166A 3166B 3166XA 3166XB 3166YA 3166YB 3166SA 3166SB 3166SC 3166TA 3166TB 3166TC Au ,7 ,2 Rl .7 Fineness 7R5 Ag SUM of X Cu Zn Ga Pb As Sb Glenn Creek} plus 20-mesh --Continued Cd Bi Hq Te Rhode Rhode Rhode Bhode Island Island Glenn Creek 5 Island Creek, Island Creek

minus 20-mesh, plus 60 middle ; , middle ! Rhode Island Creek, Creek, middle? minus Creek, middle; plus minus 20-mesh plus 20-mesh

;

-mesh flat, flat. thick thick middle? unsorted t

20-mesh crystalline. ,

20-mesh; crystalline, , , little little worn worn 3.171? 2.29P9 2.941? . n . o Ni ,0015 ,0009 ,0020 ,0018 ,0010 ,0020 ,0 ,0 ,0006 , 0007 ,0005 ,0010 ,0030 ,0020 ,0013 ,0029

Table 2 --Continued CO ro Tarn pie 3277ZC 3277BA 3277PP 3 27 7 A 3277B 3277SA 3277SB 3277SC 3277HA 3277HB 3277HC 3277FA 3277FR 3277FC 3277WA 3277WB 3277VA 3277VB 3166A 3166B 3166XA 3166XB 3166YA 3166YB 3166SA 3166SB 3166SC 3166TA 3166TB 3166TC Co Sn Mo Rhode Rhode Ge Rhode Rhode Island Island Pt Pd Ba Sr Glenn Creek! plus 20- Zr Cr Y La mesh --Continued Glenn Creek? minus 20-mesh, plus 60-mesh --Continued Island Creek, middle! minus 20 Island Creek, middle? plus 20 Phode Island Creek, middle? Creek, middle! minus 20-mesh* Creek, middle,' plus 20-mesh! -mesh? flat, thick --Continued -mesh? flat, thick --Continued unsorted --Continued crystalline, little worn Continued crystalline, little worn --Continued Sc Nb ,0 ,0005

Table 2 --Continued CO 'ample 3277ZC 3277BA 3277BB 3277A 3277R 3277SA 3277SP 3277SC 3277HA 3277HE 3277HC 3277FA 3277FB 3277FC 3277WA 3277WB 3277VA 3277VB 3166A 3166B 3166XA 3166XB 3166YA 3166YB 3166SA 3166SP 3166SC 3166TA 3166TP 3166TC Ta Be Kn Fe Kg Ca Ti Si smpl wt r=Au/Ag Glenn Creek? plus 20-mesh --Continued Au/Cu Ao/Cu r/Cu 19, ,0 19, ,0 Clenn Rhode Island Rhode Island Creek; minus 20-mesh, plus 60-mesh Creek, middle! Creek, Rhode Island Rhode Rhode Island Creek, Island Creek, middle? middle ; middle Creek minos plus minus 20 i plus 20 , middle? 20-mesh 20-mesh -mesh; flat -mesh ! flat unsorted 8,417 4, 153 3,716 2,000 1,733 1,000

Continued , thick , thick 5,253 5,217 7,314 8,297 5,978 25,462 16,646 9,491 11,793 15,746 11,436 4,456 6,980 11,058 8,525 11,713 1,333 1,333 2,000 2,000 1,000 5,000 3,000 1,500 2,143 4,000 2,857 1,500 3,000 2,000 2,857 1,605.8 1,109.7 45R.6 --Continued 8,279 11,366 5,423 1,500 2,143 1,000 --Continued 8,975 11,628 4,700 2,000 2,857 --Continued crystalline, little crystalline , little worn worn 8,071 4,706 2,143 1,000

Continued 8,601 17,115 10,718 1,500 3,000 2,143 1,186.6 --Continued 8,802 10,651 11,911 1,500 2,857 2,143

Table 2 --Continued fam pie Au ro 3199A 3199B 3199D 3278A 3278B 3278D 3278RA 3279BB 3278BD 3278Q1R 3P78Q1B 3278Q2A 3278Q2B 327flQ3 3256RA 3256RB 3256A 3256B 3256D 3256XA 3256XB 3256XD 3187A 3187B 3187D 3187F 3281A 3281B 3P81C 3281TA Fineness of X Cu Zn Ga Pb As Sb Cd Pi Hg Te Bench between Rhode Island/Glenn Creeks? unsorted Rhode Island Creek,

lower? plus Bench between Glenn/Eureka Creeks Bench Eureka between Bench Eureka Glenn/Eureka between Creek ,

Creeks?

Glenn/Eureka below

Pioneer

,

Creek, below Pioneer Creek

-mesh ? un sorted % ' minus 20-mesh, plus Creeks ? Creek , ? minus

60-mesh plus 20-mesh

unsorted 20-mesh, plus 60-mesh t

,0 ,0 ,0 ,0 ,0 .263? . o Ni ,0017 ,0009 ,0017 ,0010 ,0 ,0109 ,0 ,0 ,0 ,0 ,0020 ,0013 ,0 ,0030 ,0 ,0026 ,0015 ,0011 ,0011 ,0032 ,0014 ,0009 ,0014 ,0014

Table 2 --Continued to CJ1 Fam pie 3199A 3199B 3278A 3278B 3278BA 3278PB 3278PP 3278Qlft 3278Q1B 3278Q2ft 327802B 3278Q3 3256RA 3P56RP 3256A 3256B 3?56D 3256XA 3256XB 3256XD 3187A 3187B 3187D 3187? 3281A 3281B 3281TH Co Sn Mo Ge Pt Pd Ba Sr Zr Cr La Sc Bench between Rhode Island/Glenn Creeks? unsorted --Continued ,0 ,0 ,0 ,0 ,0 ,0023 ,0011 ,0 ,0 ,0 ,0 ,0 ,0020 022* 0o Bench Eureka Rhode .000* Island Creek, lower? plus Bench between Glenn/Eureka Creeks between Glenn/Eureka Creeks? Bench between Glenn/Eureka . 000* Fureka Creek/ below Pioneer Creek , below Pioneer .000* .000* .00*6 .000* Creek, #2 20-mesh --Continued ? unsorted minus 20-mesh, Creeks ? Creek, ? minus . o Continued plus 60-mesh plus 20-mesh #1 ? unsorted 20-mesh / plus .0*07 --Continued --Continued --Continued 60-mesh

Continued

Table 2 Continued to Sample 3199A 3199B 3199D 3?78A 3278B 3Z78C 3278D 327RBA 3278PB 3278BD 3278Q1A 3278C1B 3278Q2A 3278Q2P 3278Q3 3256PA 3P56RB 3256A 3256B 3256D 3256XA 3256XB 3256XD 3187A 3187B 3187D 31F7E 3281A 3281B 32R1TA Ta Be Kn Fe Hg Ca Ti Si smpl wt r=Au/Ag Au/Cu Ao/Cu r/Cu Bench between Bhode Island/Glenn Creeks? unsorted --Continued 0o " Bench Eureka Rhode Island Creek, lower? plus 20-mesh Continued Bench between Glenn/Eureka Creeks? unsorted --Continued 4.? 7,791 7,225 11,334 12,826 6,377 7,777 8,675 5,560 9,261 6,695 9,946 4,509 3,209 4,817 5,260 11,647 13,170 7,927 2,000 1 ,500 2,143 2,857 1,333 2,000 2,143 1,333 2,000 1,500 2,143 1,500 1 ,000 1,429 1,429 2,14? 2,000 1 ,400 1,043.1 between Glenn/Eureka Creeks? minus 20-mesh, plus 60-mesh --Continued Bench between Glenn/Eureka Creeks? plus 20-mesh --Continued Eureka Creek, below Pioneer Creek, #1? unsorted --Continued 15,974 4,122 5,451 5,470 8,756 17,880 5,186 9,737 25,965 16,585 15,367 13,622 17,816 3,000 1,000 1,000 2,000 4,000 1,333 2,857 3,333 2,000 3,000 1,429 3,000 1,065.0 1,026.3 2,362.8 1,575.5 1,465.7 1,297. 0 Creek, below Pioneer Creek, #2? minus 20-mesh, plus 60-mesh --Continued .13P6 6,120 8,205 12,724 P., 22 2 1,000 1,500 2,143 2,000 533. P

Table 2 Continued to Tample 3281TP 3P91TC 3281QA 3281QB 3281SA 3281SB 3P81SC 3281AA 3281AB 32ftlAC 3281BA 3281BB 3P81BC 3281CA 3281CB 32R1CC 3168A 3168B 3168XA 3168XB 3168RA 3168FB 3168RC 3168SA 3168SC 3168TA 3168TB 316BTC Au R9 .3 Fineness Ag Eureka SUM of X Cu Zn Creek, below Pioneer Creek, #2? Eureka Creek, below Pioneer Creek Eureka Creek Eureka Creek , below Pioneer Creek, , below Pioneer Creek, Alameda Creek; Alameda Creek Ga minus #2? #2? minus 20-mesh ? plus 20-mesh Alameda Creek? minus 20-mesh? Alameda Creek? minus 20-mesh ? Pb As 20-mesh, plus minus 60-mesh minus 100-mesh minus 160-mesh Sb 60-mesh Cd Pi Hg --Continued . o , plus 100-mesh , plus 160-mesh , plus 400-mesh ? spherical grains ? spherical grains flat thin worn crinkly, delicate/ flakes 1 .9P81 little worn 2.964* Te Ni ,0014 ,0010 ,0013 ,0015 ,0030 ,0045 ,0015 ,0024 ,0 ,0007 ,0009

Table 2 --Continued CO CO Cample 3261TR 3281TC 3281QA 3281QB 3281SA 3281SP 3281SC 3P81AA 3281AP 32R1AC 3281BA 3281BB 3281PC 3P81CA 3281CP 3P81CC 3168A 3168R 3168XA 3168XB 3168RA 3168RR 3168SC 3168SA 3168SH 3168SC 3168TA 3168TP 31&8TC Co Sn ,0 ,0 Wo Eureka Eureka Eureka Eureka Ge Pt Pd Ba Creek, below Pioneer Creek, #2? Creek, below Pioneer Creek, #2? Creek, below Creek, below Alameda Alameda Pioneer Creek , #2 i Pioneer Creek, #2? Creek ; Creek minos ; plus Sr minus minus minus Zr 20-mesh 60-mesh 100-mesh 160-mesh , plus , Plus , plus , plus 20-mesh; spherical grains 20-mesh Alameda Creek? minus 20-meeh! Alameda Creek 5 minus 20-mesh 5 spherical grains flat thin worn ? crinkly, delicate. flakes little Cr 60-mesh 100-mesh 160 -mesh 400-mesh Y La

Continued --Continued

Continued Continued -Continued -Continued --Continued . o worn --Continued Sc ,0 , 0 ,0 ,0 ,0 ,0001

Table 2 --Continued CO CO S a m p 1 e 32R1TB 3281TC 32P1QA 3281QE 3281SA 3281SB 32R1SC 3281AA 3281AP 3PR1AC 3281BA 3P81BB 3281PC 3281CA 3281CB 32R1CC 3168A 3168B 3168XA 3168XB 3168RA 3168RB 3168RC 3168SA 3168SP 3168SC 3168TA 3168TE 316RTC Ta Be W Eureka Eureka Eureka Eureka tfn Fe Mg Creek, below Pioneer Creek .000? Creek, below Pioneer Creek Creek, below Creek, below Alameda Alameda Pioneer Creek , Pioneer Creek , Ca , #2? minus , #2? minus #2? minus #2 ? minus Ti 20-mesh .OOOfi 60-mesh 100 -mesh 160-mesh Si , plus , plus , plus , plus Creek; minus 20-mesh? spherical brains Creek? plus 20-mesh? spherical grains Alameda Creek 5 minus 20-mesh? flat thin worn Alameda Creek ; minus 20-mesh' crinkly, delicate, flakes little smpl wt 60-mesh 100-fresh 160-mesh 400-ntesh r=Au/Ag Au/Cu Aa/Cu r/Cu

Continued 3,1 11,423 5,930 11,048 7,222 5,172 5,340 8,239 2,143 1,333 2,R57 2,333 1,333 1,333 2,000 311. f --Continued 12,957 12,761 5,954 1,000 1,429 1,821.3 1,276.1

Continued 6,249 6,684 5,926

Continued 4,607 6, IIP 6,789 1,068.9 -Continued 10,694 17,361 27,603 2,857 2,000 5,000 1,736.1 1,895.4 -Continued 31,984 14,279 11,935 7,500 2,000 2,143 1,791.1 1,208.0 --Continued 28,089 14,505 21/839 3,333 2,000 3,333 2,735.9 1,227.2 1,782.1 worn --Continued 11,554 9/478 12,727 12,493 28,293 29,159 1,429 2,143 1,429 2,143 3,333 3,333 1,086.1 1,300.7 2,829.3 2,950.9

Table 2 Continued Sample Au Fineness Ag SUf of X Cu Zn Ga Pb ?s Sb Cd Alameda Creek? plus 20-mesh crinkly, delicate/ little worn Bi Ha Te Ni COo 3192NP 3192NB 3192A 3192B 3192D 3192E 3193A 3193B 3190A 3190B 3190D 3191A 3191P 3189A 3189B 3189D 31R9E 3189A 3188B 3188D 31P8F 3255A 3255B 898"

Eureka Creek! above American Creek, unsorted Eureka Fureka Creek, 298P Eureka Creek Creek above , above .n bench , Boston .n Boston above Creek, Creek American Creek m

5 unsorted below Unanimus Creek ? unsorted pioneer Creek, below Poston Creek What Cheer Bar? minus 20-nesh, plus 6 0-mesh %

unsorted unsorted 000? 000? . n . n ,0005 ,0015 ,0015 ,0015 ,0011 ,0005 ,0015 ,0020 ,0010 ,0030

Table 2 --Continued Sample 3186A 3186D 3186E 3192NA 3192NB 3192A 3192B 3192D 3192E 3193A 3193B 3190A 3190B 3190D 3191A 3191B 3189A 3189B 3189D 3189F 3188A 3188B 3188D 3188F 3255A 3255B 3255D Co Sn ,0 ,0 ,0 ,0006 ,0 ,0 ,0 ,0 ,0010 ,0 Mo Ge Pt Pd Ba Sr Zr Cr Y La Alameda Creek; plus 20-mesh crinkly, delicate, little worn --Continued Eureka Eureka o Eureka Creek; above .American Creek, unsorted --Continued Eureka Creek, Creek .00?0 .n Creek bench, above American Creek? unsorted --Continued above Boston Creek, below Unanimus Creek! unsorted --Continued Boston Creek? unsorted --Continued , above pioneer Creek, below Boston Creek? unsorted --Continued What Cheer Bar! minus 20-mesh, plus 60-mesh --Continued ,0002 ,0 ,0 ,0002 ,0 ,0005 000?

Table 2 Continued CO Sample 31R6A 3186B 3186D 31R6E 3192NA 3192NB 3192A 3192R 3192D 3192F 3193A 3193B 3190A 3190R 3190D 3191A 3191B 3189A 3189B 31B9C 3189D 3189E 3188A 3188B 3188D 3188E 3P55A 3255B 3255D Ta Pe Hn Fe Ca Ti smpl wt r=Au/Ag Au/Cu Ag/Cu r/Cu Alameda Creek? plus 20-mesh? crinkly, delicate, little worn Continued 28, 30, Eureka Eureka Eurek a Creek? above American Creek, unc Eureka Creek bench, Creek, above Boston Creek, What Boston above Creek , Creek American Creek? below Unanitnus orted unsorted -Continued 27,291 13,244 9,195 33,226 46,535 16,871 22,264 42,39? 28,625 28,251 5,745 12,3R1 5,000 3,000 1,500 7,500 6,667 2,000 1,500 5,000 3,333 3,333 1,429 1,819.4 1,927.1 3,955.5 1,667.1 3,829.4 4,239.3 2,862.5 2,825.1 1,238.1 --Continued Creek? unsorted -Continued 27,621 33,781 18,654 11,416 12,027 18,823 15,712 42,449 26,588 5,000 5,000 3,000 1,429 1,429 2,000 2,000 5,000 5,000 1,841.4 2,702.5 1,392.8 1,061.7 1,171.4 2,002.8 1,445.5 4,244.9 1,772.5 ? unsorted --Continued above pioneer Creek, below Cheer Bar? minus 20-mesh, Boston Creek ? unsorted -Continued 31,600 28,115 16,186 28,968 27,304 43,436 16,386 26,968 17,380 43,952 3,333 3,333 2,000 3,333 5,000 5,000 3,000 3,333 2,000 3,476.0 2,716.0 1,521.5 2,896.8 1,820.3 4,343.6 1,092.4 2,535.0 1,738.0 4,395.2 plus 60-mesh --Continued 17,380 12,551 28,291 12,832 2,000 1,429 3,333 1,4?9 1,738.0 1,255.1 2,829.1 1,283.2

Table 2 --Continued CO CO Sample 3255XA 3255XP 3255XD 3159A 3159E 3159XA 3159XB 3159MA 3159MB 3159MC 3159RA 3159PP 3159RC 3159SA 3159SB 3159SC 3194A 3194P 3194MA 3194MB 3194MC 3195A 3195B 3195D Au Fineness Ag SUM of X Cu Zn Pb Sb Cd Bi Hg Te What Cheer Bar 5 plus 20-mesh Pioneer Creek bench 10*0 at Doric Creek ; minus 20-mesh, plus 60-mesh? flat , thin Pioneer Creek bench at Doric Creek; plus 20-mesh? blocky Pioneer Creek Pioneer Creek Pioneer bench at Doric bench at Doric Creek bench at Seattle Jr Skookum Creek? Doric . creek Creek ? Creek? minus minus 100-mesh 60 -mesh , plus 160 -mesh Creek; minus 160-mesh 5 unsorted unsorted Ni ,0017 ,0006 ,0010 ,0017 ,0013 ,0015 ,0005 ,0005 ,0020 ,0015 ,0050 ,0027 noi3 North Fork Pioneer Creek? unsorted, #1

Table 2 --Continued CO Sample 3255XA 3255XP 3255XD 3159A 3159B 3159XA 3159XP 3159MA 3159MB 3159MC 3159RA 3159RB 3159RC 3159SA 3159SR 3159SC 3194B 3194MA 3194MB 3194MC 3195A 3195B 3195D Co Ge Pt Pd Ba Sr Zr Cr La Sc What Cheer Bar? plus 20-mesh --Continued ,0007 ,0 !. Pioneer Creek bench at Doric Creek ? minus 20-mesh Pioneer Creek bench at Doric Creek; plus Pioneer Pioneer Creek Creek Pioneer bench at Doric bench at Doric Creek? Creek bench at Seattle Jr Skookura Doric . creek Creek ? Creek ? , plus 60-mesh? flat , thin -Continued 20-mesh; blocky --Continued minus 60-mesh --Continued minus 100-mesh, plus 160-mesh Creek? minus 160-mesh --Continued --Continued unsorted --Continued unsortert

Continued Nb ,0 ,0002 ,0 ,0002 P002 35, North Fork Pioneer Creek; unsorted, #1 --Continued

Table 2 --Continued CO CJ1 ?a p] e 3255XA 3255XR 3?55XC 3159A 3159B 3159XA 3159XR 3159MA 3159MB 3159MC 3159RA 3159RB 3159FC 3159SA 3159SB 3159SC 3194A 3194B 3194MA 3194MB 3194MC 3195A 3195B 3195D 32, Be w Mn Fe Mg Ca Ti Si smpl wt r=Au/Ao Au/Cu What Cheer Bar? plus 20-mesh --Continued Pioneer Creek bench at Doric Creek? minus 20-mesh, plus 60-mesh? flat ,thin 28,940 33,476 32,720 25,090 Continued 17,374 16,966 16,963 Ag/Cu 3,333 3,333 5,000 3,333 2,000 2,000 2,00 0 r/Cu 2,894.0 3,802.9 2,582.7 2,222.9 1,737.4 1,696.6 1,696.3 Pioneer Creek bench at Doric Creek; plus 20-mesh; blocky --Continued Pioneer Pioneer Creek bench at Doric Creek? minus 60-mesh --Continued 11,126 14,301 13,247 28,930 28,91? 28,882 1,429 2,143 2,143 3,333 3,333 3,333 1,117.4 2,893.0 2,891.2 2,888.2 Creek bench at Doric Creek? minus 100-mesh, plus 160-mesh --Continued Pioneer Creek bench at Poric Creek; minus 160-mesh --Continued Seattle Jr. creek? unsorted --Continued Skookum Creek? unsorted Continued 12,401 8,669 1,277 13,279 8,112 15,142 13,080 11,811 11,658 11,669 7,625 17,879 1,429 1,000 ?,857 2,000 3,000 3,000 2,857 2,143 2,143 3,000 4,000 1,240.1 1P2.5 1,028.0 North Fork Pioneer Creek? unsorted, #1 --Continued

Table 2 --Continued CO CO 3196A 3196B 3196D 3197A 3197B 3197P 3291QA 3291QB 3291QC 3291RA 3291RR 3291PC 3291SA 32=1158 3291TA 3291TB 3291TC 3291Z 3215A 3215B 82 .R P2.7 P47 Slate Creek? North Fork Pioneer Creek? unsorted, #2 Slate Creek 5 plus 20-meshJ accreted crystalline Slate Creek! minus 20-mesh/ plus 60-mesh? coated Slate Creek? minus 20-mesh, plus 60-meshJ little Slate Creek; minus 20-mesh, plus 60-mesh, light grains quartz traveled yellow minus 20-mesh, plus 60-mesh? orange and black crystalline Slate Creek? minus 60-mesh, plus 100-mesh Slate Creek? minus 100-mesh Ruby Creek, #15 unsorted .000? aogreoates

Table 2 --Continued CO Sa mrlf 3196A 3196B 3196D 3197A 3197B 3197D 3291QA 3291QB 3291QC 3291RA 3291RB 3P91RC 3291SA 3291SP 3291TA 3291TR 3291TC Sn Slate Ho Ge Creek ? Slate Slate Slate Slate minus Pt North Fork North Fork Creek 5 plus Creek ; minus Creek? minus Creek? minus 20-mesh, plus Slate Creek Pd Pioneer Pioneer 20-mesh! 20-mesh, 20-mesh, 20-mesh 60-mesh ? minus Slate Creek? 3291Z Ruby Creek, 3215A 3215B Ba Sr Zr Cr Y La Creek? unsorted, #1 --Continued Creek? unsorted, #2 --Continued accreted crystalline grains --Continued plus 60-mesh? coated quartz --Continued plus 60-mesh? little traveled Continued , plus 60-mesh, light yellow --Continued ? orange and black crystalline aggregates 60-mesh, plus 100-mesh Continued minus 100-mesh --Continued #1? unsorted Continued Sc Nfr . n . p p . n --Continued n

Table 2 --Continued Ta Be CO 3291Z 3215A 321SB Mn Fe Mg Ca Ti North Fork Pioneer Creek? unsorted, Si smpl wt r=Au/Aa --Continued Au/Cu Aa/Cu r/Cu 3196A 3196B 3196D North Fork 3197A 3197B 3197D 32910A 3291QB 3291QC 3291RA 3291RB 3291RC 3291SA 3291SB 3291TA 3291TB 3291TC Slate Creek ? Slate Creek? Slate Creek ; Slate Creek; Slate Creek; minus 20-mesh Pioneer Creek 5 unsorted, #2 plus 20-mesh? accreted crystalline minus 20-mesh, plus 60-mesh ? coated minus 20-mesh, plus 60-mesh; little minus , plus 20-mesh, plus 60-mesh, light 29,245 13,174 12,158 7,676 ,000 ,143 ,857 ,000 2,066.7 3R3.8 --Continued grains quartz traveled yellow 60-mesh; orange and black crystalline --Continued --Continued Continued

Continued aggregates 14,958 8,178 10,780 11,820 "? 2,682 7,341 5,309 11,435 5,443 1,821 2,573 --Continued 4,395 5,268 2,824 ,000 ,500 ,857 ,143 mo ,000 ,000 ,857 ,000 2CO ,000 Slate Creek; minus 60-mesh, plus 100-mesh Continued Slate Creek; minus 100-mesh --Continued Ruby Creek, #1; unsorted Continued 4,530 1PO

Table 2 Continued CO CD F a m p 1 e 3276A 3276B 3276P 3276AA 3P76AB 3276AC 3276AD 3276BA 3276BB 3276BC 3P76BD 3019A 3019B 3019D 3019E 3020A 3214A 3214B 3214XA 3214XB Au Fineness SUM of X Cu Zn Ga Pb As Sb Cd Ruby Creek, *2! unsorted Hoosier Creek? crystals with quartz Bi Te Ni ,5000 Foosier Creek! folded crystals with Hoosier Creek! crystals! Hunter Creek, #1 ! quartz .000? .001? many impurities unsorted . o .470* Hunter Creek, #2! minus 35-mesh 41, Hunter Creek, #2! plus 35-jnesh 970' Hunter Creek, below Dawson Creek? minus 20-mesh, plus 60-mesh Hunter Creek, below Dawson Creek! plus 20-mesh ,0003 ,5000 ,3000 ,5000 ,9416 ,89?9 3020XA 3020XB 3020XD 3020XE

Table 2 Continued Sample 3276A 3276R 3P76D 3276AA 3276AR 3276AC 3276AD 3276BA 3276BB 3276BC 3?76BD 3019A 3019B 3019D 3019E 3020A Co Sn Ge Pt Pd Ba Sr Zr Cr La Sc 3214A 3214P 3214XA 3214XB ,0 ,0020 ,0 ,0 ,0 Ruby Creek, #2? unsorted --Continued Hoosier Creek? crystals with quartz --Continued Hoosier Creek 5 Hoosier Creek Hunter

folded crystals

crystals ? Creek, 4 1 ;

many ,

with

quartz impurities ,

unorted , --Continued --Continued . o --Continued Hunter Creek, #2? minus 35-mesh --Continued Hunter Creek, #2? plus 35-mesh --Continued Hunter Creek, below Dawson Creek? minus 20-mesh, plus 60-mesh --Continued Hunter Creek, below Dawson Creek? plus 20-mesh --Continued Nb . n ,0013 ,0 ,0010 ,0 3020XA 3020XB 3020XD 3020XE

Table 2 --Continued Ta 3?82 3276A 3276R 3P76D 3P76AA 3276AB 3276AC 3P76BA 3276BB 3276BC 3276BD 3019A 3019B 3019D 3019E 3020A 3214A 3214B 3214XA 3P14XP. Be Kn Fe Ca Ti Si sinpl wt r=Au/Ag Au/Cu Ag/Cu Puby Creek, #2! unsorted Continued Hoosier Creek? crystals with quartz Continued Hoosier Hoosier Creek! Creek Hunter folded crystals ! crystals! many Creek, with auartz impurities Continued

Continued #1! unsorted --Continued Hunter Creek, #2? minus 35-mesh --Continued Hunter Creek, #2? plus 35-mesh Continued 2,942 1,000 r/Cu 1,123 2,811 2,474 2,331 1,268 1,059 1,335 1,104 4,763 2,749 2,432 2,673 9,331 8,125 1,725 12,725 31,700 1,600 1,314 1,223.0 1,055.7 3,061.8 1,377.6 14,419.7 15,223 1,340 1,899.5 3020XA 3020XB 3020XD 3020XK 15,831 35,030 5,199 4,992 4,375 8,000 3,022.3 1,900.4 2,449.8 Hunter Creek, below Dawson Creek! minus 20-mesh, plus 60-mesh --Continued Hunter Creek, below Dawson Creek! plus 20-mesh --Continued 1,369 1,889 1,885 5,038

Table 2 --Continued Sample 3214RA 3214RB 3214RC 3214SA 3214SB 3214SC 3214TA 3214TB 3214TC Au Fineness Ag SUK of X Cu Zn Ga Hunter Creek, below Dawson Creek Hunter Creek, below Dawson Creek? Hunter Creek, below Dawson Creek! Hunter Creek, below Dawson Pb As ? plus 20-mesh minus 60-mesh, minus 100-mesh, Sb Cd Bi Ho Te Ni --Continued plus 100-plus 160-mesh mesh .185? Creek? minus 160-mesh Hunter Creek, above Dawson Creek? unsorted, A 3213A 3213B Hunter Creek, above Dawson Creek? unsorted, B 3213VA 3213VB Hunter Creek/ above Dawson Creek? unsorted, 1 3213R P.8 Hunter Creek, above Dawson Creek; unsorted, 2 3213S Hunter Creek, above Dawson Creek? unsorted, nugget 4.90?0 3213TA 3213TB 3213TC 3P75A 3275B 3?75C Gunnison Creek? minus 20-mesh, plus 60-mesh? flat. smooth flakes .679f

Table 2 --Continued CO Sample Co Sn Mo Ge Pt Pd Ba Sr Zr Cr Y La Hunter Creek, below Dawson Creek? plus 20-mesh --Continued Hunter Creek, below Dawson Creek; minus 60-mesh,plus 100-mesh --Continued Sc Nb 3214RA 3214RE 3214RC 3214SA 3214SB 3214SC 3214TA 3214TB 3214TC 3213A 3213P 3213VA 3213VB 3213R 3213S 3213TA 3213TB 3213TC 3275A 3P75B Hunter Creek, below Dawson Creek? minus 100-mesh, plus 160-mesh --Continued Hunter Creek, Hunter Creek Hunter Creek Hunter Creek Hunter Creek below Dawson Creek? minus 160-meeh , above Dawson Creek? , above Dawson Creek ? , above Dawson Creek? , above Dawson Creek? .005ft unsorted, A unsorted , P unsorted, 1 unsorted, 2 Hunter Creek, above Dawson Creek? unsorted, nugget Gunnison Creek? minus 20-mesh, plus 60-mesh ? flat, smooth

Continued -Continued -Continued -Continued -Continued --Continued flakes --Continued . n

Table 2 --Continued Sample Ta Be W Mn Fe Hg Ca Ti Si smpl wt r=Au/Ag Au/Cu Hunter Creek, below Dawson Creek? plus 20-mesh --Continued 3214XT 6,471 Hunter Creek, below Dawson Creek! minus 60-mesh,plus 100-mesh --Continued r/Cu 1,338.2 3214RA 3214RP 3P16RC 3214SA 3214SP 3214SC 3214TA 3214TB 3214TC 3213A 3213B 3213VA 3213VP 3213R 3213S Hunter Creek, below Dawson Creek! minus 100 -mesh, plus 160-mesh --Continued 1,755 Hunter Creek, below Dawson Creek; minus 160-mesh --Continued Hunter Hunter Hunter Hunter Creek, above Dawson Creek! Creek, above Dawson Creek! Creek, above Dawson Creek! Creek, above Dawson Creek! unsorted unsorted unsorted unsorted , A --Continued , B --Continued , --Continued , --Continued 3,107 4,587 1,989 1,256 10,006 4,063 1,000 1,140.7 Hunter Creek, above Dawson Creek! unsorted, nugget --Continued 3213TA 3213TB 3213TC 3275A 3275R Gunnison Creek ! minus ?0-mesh, plus 60-mesh! flat. smooth flakes --Continued 8,849 5,351 8,816 1,169 1,500 1,500

Table 2 --Continued cn Sample Au Fineness Ag SUM of X Cu Zn Ga Pb As Sb Cd Gunnison Creek; minus 20-mesh, plus 60-rnesh oblong, flat, smooth Pi Ha Te Ni 3275BA 3275BB 3275BC 3275CA 3275CB 3P75FA 3275FB 3275FC 3275HA 3275HB 3275HC 3275QA 32750E 3275LA 3275MA 3275MB 3275NA 3275NB 3275RA 3275RB R9.8 ,3£76 Gunnison Creek? minus 20-mesh, plus 60-mesh? delicate, crumbly, thin Gunnison Creek? minus 20-mesh, plus 60-jnesh? angular blocky Gunnison Creek; minus 20-mesh, plus 60-mesh? dimpled, rounded nuggets Gunnison Creek? minus 20-mesh, plus 100-meshJ stained red, flat flakes Gunnison Creek; minus 60-mesh, plus 100-mesh; rounded flakes Gunnison Creek? minus 60-mesh, plus 100-mesh? oblong, flat flakes Gunnison Creek? minus 60-mesh, plus 100-mesh? angular, blocky flakes Gunnison Creek! minus 60-mesh, plus 100-mesh! crinkly, thin flakes Gunnison Creek! minus 100-mesh, plus 160-mesh! spheriods 3275T Gunnison Creek? plus 20-mesh? flat, thin flakes 3275XA ,0131 ,0614

Table 2 --Continued Sample Co Sn Mo Ge Pt Pd Ba Sr 7r Cr Y La Gunnison Creek? minus ?0-mesh, plus 60-mesh? oblong, flat, smooth --Continued Sc 3275BA 3?7?BB 3T75RC 3275CA 3275CB 3P75CC Gunnison Creek? minus 20-mesh, pi us 60-mesh ? Gunnison Creek? minus 20-mesh, plus 603P75FA 3275FB 3275FC 3275HA 3275HB 3275HC 3275QA 3275QP Gunnison Creek? minus 20-mesh, Gunnison Creek? minus 20-mesh, plus 60-mesh? plus 100-mesh? Gunnison Creek? minus 60-mesh, plus 1003275LP 3275MA 3275MB 3275NA 3 2 7 5 N B 3275RA 3P75RB Gunnison Creek Gunnison Creek? Gunnison Creek? delicate, crumbly, thin

Continued mesh; angular blocky --Continued dimpled , rounded nuggets stained red, flat flakes --Continued

Continued . o mesh; rounded flakes --Continued ? minus 60-mesh, plus 100-mesh? oblong minus 60-mesh, minus 60-mesh plus 100-mesh 5 angular. , plus 100-mesh? crinkly , flat flakes blocky flakes , thin flakes

Continued Continued

Continued Gunnison Creek? minus 100-mesh, plus 160-mesh! spheriods --Continued nunnison Creek; plus 20-mesh; flat, thin flakes --Continued

Table 2 --Continued Sample Ta Be W Vn Fe Mg Ca Ti Si smpl wt r=Au/Ag Au/Cu Gunnison Creek? minus 20-mesh, plus 60-mesh? oblong, flat, smooth --Continued Ag/Tu r/Cu 3275BA 3275BB 3275BC 3275CA 3275CB 3275FA 3275FB 3275FC 3275HA 3275HB 3275HC 3275QA 3T75QE 3 27 5 LA 3275MA 3275MB 3275NA 3275NB 3275RA 3275RB 1,987 1,414 Gunnison Creek? minus 20-mesh, plus 60-mesh? delicate, crumbly, thin Continued 2,121 Gunnison Creek? minus 20-mesh, plus 60-mesh? angular blocky --Continued 1,086 1,366 Gunnison Creek? minus 20-mesh, plus 60-mesh ? dimpled, rounded nuggets --Continued 3,922 2,843 1,261 Gunnison Creek? minus 20-mesh, plus 100-mesh? stained red, flat flakes --Continued 1,466 1,036 Gunnison Creek? minus 60-mesh, plus 100-mesh? rounded flakes --Continued 2,111 Gunnison Creek? minus 60-mesh, plus 100-mesh? oblong, flat flakes --Continued 1,302 2,878 Gunnison Creek? minus 60-mesh, plus lOO-mesh? angular, blocky flakes Continued 1,732 1,000 Gunnison Creek? minus 60-mesh, plus 100-uiesh? crinkly, thin flakes Continued 2,743 1,894 3275T 3?75XA Gunnison Creek? minus lOO-mesh, plus 160-mesh? spheriods --Continued Gunnison Creek? plus 20-mesh? flat, thin flakes --Continued 1,103

Table 2 Continued Sample Au Fineness fig SUM of X Cu Zn Ga Pb As Sb Cd Gunnison Creek 5 plus 20-mesh; flat, thin flakes Continued Bi Ho Te Ni 3275XB 3275ZA 3275ZB 3275ZT 3290YA 3290YB 3290YC Gunnison ,P Creek? plus 20-mesh Quail Creek? Quail Creek; 10-mesh; 3290XA 3290XB 3290WA 3290WB 3290WC 3290TA 3290TB 3290TC 3290RA 3290PB 3290RC Quail ? rounded, delicate like amalqam flat yellow grain? grains .000? Quail Creek; associated impurities Ouail Creek; slag Quail Creek; large, Creek? plus 20-mesh like impurities flat, yellow grains well worn, thin grains

Table 2 Continued Co Sn Wo Ge Pt Pd Ba Sr ?,r Cr Y Gunnison Creek? plus 20-mesh? flat, thin flakes Continued La Se Nb 3275XB 3?7f XC 3275ZA 3275ZB 3P75ZC Gunnison Creek? plus 20-mesh; rounded, delicate grains Continued Quail Creek! like amalgam Continued 3290YA 3290YB 3290YC Quail Creek? 10-mesh? flat yellow brains 3290XA 3290XB 3290KA 3290WB 3290WC 3290TA 3290TB 3290TC 3290RA 3290BB 3290PC Quail Quail Creek? associated impurities Quail Creek? slag like impurities Quail Creek; large, flat, yellow grains --Continued -Continued -Continued --Continued . o Creek? plus 20-mesh? well worn, thin grains --Continued

Table 2 Continued cno 3275XB 3275ZA 3275ZB 3P757C 3290YA 3290YB 3290YC 3290XA 3290XB 3290WA 3290WB 3290WC 3290TA 3290TB 3290TC 3290PA 3290RB 3290FC Ta Be Mn Fe Mg Ca Ti Si smpl wt r=Au/Ag Gunnison Creek; plus 20-mesh: flat, thin flakes Continued Au/Cu Aq/Cu unison Creek! plus Quail Quail Creek? 1,959 20-mesh! rounded, delicate grains --Continued Creek 5 like amalgam --Continued 10-mesh! flat yellow grains Continued 1,738 1,559 8,335 12,354 4,506 1,739 4,638 3,472 1,000 2,143 Quail Creek; associated impurities --Continued 6,860 Quail Creek; slag like impurities --Continued Quail Creek? Quail Creek; plus large, flat, yellow grains --Continued 20-mesh? well worn, thin grains --Continued 8,984 2,212 2,695 3,278 1,500 r/Cu 2,561.2

Table 3. Spectrographic analyses for the nonmagnetic fraction of the heavy-mineral-concentrate samples from placer gold samples from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Llvengood quadrangles, Alaska |N, not detected; detected but below limit of determination shown; determined to be greater than value shown; values in parts per million except where noted; %, percent. No concentrate samples collected at sites 8, 18, 19, 39, 44, and 45.] samp 1 e number 3208A 321 1A 319SA 3192A 3192S 3255A 3213VR 3213S 3213T s i te LOCATION Fe % Mg % Ca % Ti % Mn Ag As number Boulder Creek, Bench, 14 Boulder Creek, Bench, 12 Boulder Creek* Bench, 12 Boulder Creek, Bench, 11 Colorado Creek Amer i can Creek New York Gulch New Yor k Gu 1 ch Wood Chopper Creek, upper Mi 1 ler Gulch Tofty Gulch Tofty Gulch Cashe Creek Blowback Creek Cooney Creek Thanksgiving Creek Omega Creek, lower Omega Creek, lower Omega Creek, upper Rhode Island Creek, upper Rhode Island Creek, upper Bench between Rhode Isfand/Gfenn Creeks Rhode Island Creek, lower Bench between Glenn/Eureka Creeks Eureka Creek below Pioneer Creek 11 Pioneer Creek below Pioneer Creek 12 Alameda Creek Eureka Creek above American Creek Eureka Creek bench above American Creek Eureka Creek above Boston below Unanimus Eureka Creek above Boston below Unanimus Boston Creek Eureka Creek above Pioneer below Boston What Cheer Bar What Cheer Bar Pioneer Creek bench at Doric Seat tie Jr . Creek Skookum Creek North Fork Pioneer Creek North Fork Pioneer Creek Slate Creek Ruby Creek , Ruby Creek , Hunter Creek , Hunter Creek, Hunter Creek, 2 Hunter Creek below Dawson Creek Hunter Creek above Dawson Creek Hunter Creek above Dawson Creek Hunter Creek above Dawson Creek 3,0 5,0 7,0 7,0 7, 0 20,0 7,0 10,0 3,0 2,0 20, 0 2,0 20, 0 , 10 , 70 1 ,00 ,20 1 ,00 ,70 2,00 ,70 ,70 ,30 , 10 ,20 ,50 3,00 , 10 1 ,50 1 ,00 , 15 , 15 2,00 , 15 ,70 ,70 ,20 5,00 , 15 , 15 , 15 , 10 ,20 ,50 ,50 ,20 , 10 ,70 ,50 1 ,50 2,00 )2,00 ,50 ,30 2,00 ,30 1 ,00 2,00 ,30 ,20 ,50 1 ,50 1 ,50 2,00 2, 00 2,00 2, 000 2,000 1 ,000 2,000 1 , 000 3,000 3, 000 1 ,500 3,000 5,000 3,000 1 ,500 2,000 3,000 1 ,000 10 ,000 3, 000 3, 000 15,000 2, 000 1 ,500 1 ,500 N N N N N N 1 , 000 10,000 1 , 000 1 , 000 N N N N N N N N N 1 ,500 N N 1 , 000 N 1 ,500 N N N N N 1 , 000 N 1 ,000 1 , 000 1 ,500 1ST' N N N N N N N 1 , 000 2, 000 2, 000 N N 2, 000 2, 000 N N N

Table 3. Spectrographlc analyses for the nonmagnetic fraction of the heavy-mineral-concentrate samples from placer gold samples from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska Continued |N, not detected; detected but below limit of determination shown; determined to be greater than value shown; values in parts per million except where noted; %, percent. No concentrate samples collected at sites 8, 18, 19, 39, 44, and 45.) Sample Au B Ba Be Bi Cd Co Cr Cu La Mo Nt> 3208A 321 1A 3198A 3192A 3192S 3255A 3213VR 3213S 3213T N N N N N N N 1 ,000 1 ,000 N 1 ,000 1 , 000 N N N N (20 1 ,000 <20 N N N N N N <20 (20 N 2,000 1 ,000 1 ,000 50,000 10,000 10,000 1 ,500 2,000 2,000 10,000 2,000 2,000 1 ,500 1 ,000 5, 000 2,000 10,000 1 ,000 15,000 15,000 5,000 3,000 1 , 000 3,000 10, 000 5, 000 10 ,000 10, 000 50,000 10,000 50,000 50,000 50,000 50,000 N N N N N N N N N N N N N N N N N N N N N N N N N N N N

N N N N N N (2 N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N 1 ,000 N 2,000 1 ,500 2,000 N 1 ,000 2,000 1 ,000 N N 1 ,500 1 ,500 1 ,000 1 ,500 1 ,000 10,000 1 ,000 2,000 N N 1 ,500 1 ,500 N 2,000 1 ,000 1 ,500 2,000 2,000 2,000 1 ,000 2, 000 2,000 1 ,500 2,000 2,000 1 ,000 N N 1 ,000 N 1 , 000 2,000 2,000 N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N (50 <50 N N N N N N N N <50 <50 N <50 N N <50 (50 N N N N N N <50 <50 N 1 , 000 1 , 000 1 , 000 1 ,500 1 , 000

Table 3. Spectrographlc analyses for the nonmagnetic fraction of the heavy-mineral-concentrate samples from placer gold samples from the Manley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Hvengood quadrangles, Alaska Continued [N, not detected; detected but below limit of determination shown; determined to be greater than value shown; values in parts per million except where noted; %, percent. No concentrate samples collected at sites 8, 18, 19, 39, 44, and 45.1 Sample Pb Sb So Sn Sr W Y Zn Zr 3208A 321 1A 3198A 3192A 3192S 3255A 3213VR 3213S 3213T N N N 1 ,000 3,000 7,000 1 ,000 N 50,000 1 ,500 2,000 2,000 10,000 5,000 50, 000 5,000 N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N (200 N N N 1 ,000 N N N N N N 10 N N N N N N N N N N 1 ,500 N N N N (20 N 2,000 N N )2,000 N N N N N 2,000 N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N 2, 000 5,000 1 ,000 1 , 000 N N N N N N 'N N N N N N N N N N N N N N N N N N N N N N N N N N 1 ,000 N N N N N N 1 ,000 5,000 2,000 1 ,000 1 ,000 1 ,500 N N N N N N N N N N N N N N N N N N N 1 , 000 N N N N 1 ,000 1 ,000 1 , 000 N N N N 1 ,000 N N N N N N N N N N N N N ' )2,000 2,000 1 ,500 2, 000 2,000 2,000 )2,000 2,000 2, 000 1 , 000 N 2, 000 2, 000 Th N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N

Table 4. Binocular microscope mineralogy of the nonmagnetic fraction of the heavy-mineral-concentrate samples from placer gold samples from the Hanley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska [Amalgam, AuHg; anatase, Ti02 ; anglesite, PbS04 ; arsenopyrite, FeAsS; barite, BaS0 4 ; Cassiterite, Sn04 ; chalcopyrite, CuFeS2 ; cinnabar, HgS; cyrotolite, Y, ; galena, PbS; gold, Au; manganese, Mn; minium, Pb304 ; monazite, (Ce, La, 4 ; pyrite, FeS2 ; rutile, ; scheelite, CaW04 ; sphalerite, and thorite, ThSi04 . No mineralogy for sites 8, 9, 18, 19, 39, 44, and 45. X, present; 70, estimated percentage

O)

oc

OJ 4-> si> o0c

a. io lo Sphalerite

4-> ro 4->

0) 4-> rS-to CO Cassiterite E3 rC r-s:

o JZ hX (U o: Anatase Comments Pyrite cubes in schist Cinnabar in opal matrix 40% sul fides Nodular, warty manganese