Gold analytical results and gold signatures from the Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Ophir, Ruby, and Talkeetna quadrangles, Alaska
Gold analytical results and gold signatures from the Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Ophir, Ruby, and Talkeetna…
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UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Gold analytical results and gold signatures from the Anchorage, Charley River, Healy, Iditared, Juneau, Mt. Hayes, Nt. McKinley, Ophir, Ruby, and Talkeetna quadrangles, Alaska By John B. Cathrall,* John C. Antweiler,* George VanTrump,* and Elwin L. Hosier* Open-File Report 90-210 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. *U.S. Geological Survey, DFC, Box 25046, MS 973, Denver, CO 80225
CONTENTS Page Introducti on Sampling and Analytical Procedure Reliability of Gold Analyses Description of Data Tables Other Publications References Cited ILLUSTRATIONS Figure 1. Localities of samples from the Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Ophir, Ruby, and Talkeetna quadrangles, Alaska TABLES Table 1. Index for site, type of sample, locality name, and sample description for lode gold and placer gold samples from the Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Ophir, Ruby, and Talkeetna quadrangles, Alaska 8 Table 2. Lower limits of determination for the spectrographic analyses of gold based on 5-mg sample 10 Table 3. Analytical results for lode gold, placer gold, and gold signatures from the Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Ophir, Ruby, and Talkeetna quadrangles, Alaska 11
Figure I. Localities of samples from the Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Ophir, Ruby, and Talkeetna quadrangles, Alaska 250 KILOMETERS / . 60°- 138° 135°
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 and lode gold samples collected from placer and lode gold deposits from Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Ophir, Ruby, and Talkeetna quadrangles, in Alaska. 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 and lode gold samples were obtained from active claims in the Anchorage, Charley River, Healy, Iditarod, Juneau, Mt. Hayes, Mt. McKinley, Opher, Ruby, and Talkeetna quadrangles, Alaska. For some localities, miners provided us with sufficient amounts of sample for analysis whereas for other localities the samples were collected by the USGS. To determine whether differences in composition could be correlated with physical attributes, some samples were sorted based on physical appearances. Some were sieved into two or more size ranges; others were separated by color; and some were separated on the basis of other physical characteristics, e.g., rounded, angular, blocky, delicate, etc. Descriptive information, when available, is included in table 1. If no descriptive information is provided, the samples were generally small, and no sorting of individual grains was attempted prior to analysis. A total of 182 emission spectrographic analyses using a technique described by Mosier (1975) were made on samples from 35 mines and prospects. These are the numbered sites on the sample locality map (fig. 1) and correspond to the locality index (table 1). The elements analyzed and their lower limits of determination are listed on table 2. 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 pure metallic gold. Pure AloO was added to the standards and samples as a co-distillation 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 particulate nature of native gold, it often was impossible to weigh exact 5-mg portions for analysis, and in many instances there was 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:
EXPLANATION 1° x 3° quadrangle covered in this report showing quadrangle code, placer and lode locality Quadrangle code AN CY HE ID JU MH MM OP RB TL Mining district 1° x 3° quadrangle Anchorage Charley River Healy Iditarod Juneau Mt. Hayes Mt. McKinely Ophir Ruby Tal keetna No. of localities No of analysis TBZ .1 Locality where placer gold/platinum sample collected x3~Locality where lode gold sample collected Locality Index Quadrangle Code Locali ty Quadrangle Code Locali ty AN CY HE ID JU Willow Creek Coal Creek Bryn Mawr Creek Valdez Creek Snow Gulch Happy Creek Idaho Mine Prince Creek Black Creek Otter Creek Granite Creek Ganeo Creek Golden Horn Mine Johnson Creek Gold Creek, I Gold Creek, II Gold Creek, III A-J Glory Hole Treadwell Glory Hole Treadwell Mill MH MM OP RB TL Broxson Gulch North Fork Rainy Creek Rainy Creek Tertiary Gravel, above Miller Gulch Quartz-Slate Creek area Glacier Creek at 22 Gulch Yellow Pup Creek Stampede Creek Ophir Creek Spruce Creek, I Spruce Creek, II Anvil Creek Colorado Creek Solomon Creek Nugget Creek, Morgans upper bench Mining district where analytical results, geochemical signatures, mineralogical data, and sample locality maps of the lode gold, placer gold, placer platinum, placer silver, and heavy-mineral concentrates are identified by U.S. Geological Survey Open-File Reports. Open-File Report Mining district number A. B. D. E. F. G. No of localities Koyukuk-Chandalar Manley, Tofty, Eureka, Rampart Tolovana Tolovana Circle Fairbanks Fortymile Bonni field No of samples analysed 27754"
reported concentration value determined value x sample weight in mg As a result, some values reported in table 3 are smaller than the normal lower limit of determination (table 2) if the sample weight was mg. 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 and accuracy of the analysis. Studies using artificial standards show that the precision of the analytical method exceeds by at least a factor of ten the natural variance of trace elements in native gold (Hosier, 1975). Accuracy is much more difficult to determine than precision because the analytical recovery of targe elements varies with sample matrices. Standards prepared with known amounts of copper and silver show the method to be accurate within a factor of two for determination of those elements (Hosier, 1975) over concentration ranges relative to this study. RELIABILITY OF GOLD ANALYSES Differences in the composition of native gold from different geological settings can be readily distinguished using the analytical procedures if enough analyses are made to ascertain the magnitude of natural variations in gold samples from a given geological setting (Hosier, 1975). In this study, five or more spectrographic analyses of sample from a single sample site were required to obtain a reliable signature. However, in the context of many other analyses from this district, a single analysis is still of value. 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 deposits, single particles of native gold are relatively homogeneous, but in other deposits single particles of native gold are heterogeneous (Boyle, 1979). Even when single gold grains are known to be heterogeneous, gold compositional data are useful in characterizing conditions of ore deposition and are often 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 composition for Ag and Cu in gold from a single locality was determined by repeatedly analyzing portions of individual nuggets (Hosier, 1975; Antweiler and Campbell, 1987). The silver content of portions of one such nugget ranged from 4.7 to 8.1 percent in four analyses with a mean silver content of 5.7 percent and the copper content of this nugget ranged from .048 to .08 percent with a mean copper content of .062 percent. Replicate analyses of portions of another nugget from the same locality showed silver content ranging from 18.9 to 19.8 percent, a mean silver content of 19.3 percent and copper content ranging from .038 to .055 percent, a mean of .047 percent. These results indicate 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. Replicate analyses of ten 5-mg portions of that nugget showed excellent precision: 10 percent silver and 0.05 percent copper. Without acid washing and heat treating, analyses of
ten 5-mg portions of a similar untreated nugget showed ranges in silver content from 1.5 to 15 percent and copper content ranges from .015 to .05 percent (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 from 10 analyses of the natural sample, were almost the same as the mean values for those elements on the homogenized sample, except for elements removed by the acid and heat treatment. 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. Mint or banks or by commercial refiners. Compilations of Alaska gold fineness data have been made by Smith (1941), Metz and Hawkens (1981), and in unpublished data on file in the Fairbanks office of the First National Bank. 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 number of samples appear to be as accurate as the data from those sources and are, therefore, reliable to the extent permitted by natural variation of gold composition. DESCRIPTION OF DATA TABLES The analytical results for lode and placer gold (table 3) are given in weight percent and are presented by site numbers and gold type which are keyed to table 1. 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 Au wt% x 1,000. Au wt% + Ag wt% The gold value was determined by difference, that is: Au* 100-(Ag% + X%), where is the sum of elements other than gold and silver. If an element was not detected at the lower limit of detection, " " 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 alloy ratios that are part of the gold signature (Antweiler and Campbell, 1976). Because the corrected values shown in table 3 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. 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 Koyukuk-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, Livengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 87-330, 12 pages, 1 pi. HcDanal, S.K., Cathrall, J.B., Hosier, E.L., Antweiler, J.C., and Tripp, R.B., 1988, Analytical results, geochemical signatures, mineralogical data, and sample locality map of placer gold and heavy-mineral concentrates from the Hanley Hot Springs, Tofty, Eureka, and Rampart mining districts, Tanana and Livengood quadrangles, Alaska: U.S. Geological Survey Open-File Report 88-443, 54 p. Cathrall, J.B., HcDanal, S.K., VanTrump, G., Hosier, E.L., and Tripp, R.B., 1988, Analytical results, geochemical signatures, mineralogical data, and sample locality map of lode gold, placer gold, and heavy-mineral concentrates from the Tolovana mining district, Livengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-578, 32 p. Cathrall, J.B., Tripp, R.B., HcDanal, S.K., Hosier, E.L., and VanTrump, G., 1988, Analytical results, geochemical signatures, mineralogical data, and sample locality map of placer gold and heavy-mineral concentrates from the Circle mining district, Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-676, 48 p., 1 pi. Hosier, E.L., Cathrall, J.B., Antweiler, J.C., and Tripp, R.B., 1989, Geochemistry of placer gold, Koyukuk-Chandalar mining district, Alaska: Journal of Geochemical Exploration, v. 31, p. 97-115. Cathrall, J.B., Albanese, H., VanTrump, G., Hosier, E.L., and Lueck, L., 1989, Geochemical signatures, analytical results, mineralogical data, and sample locality map of placer and lode gold, and heavymineral concentrates from the Fortymile mining district, Eagle quadrangle, Alaska: U.S. Geological Survey Open-File Report 89-451, 32 p. Cathrall, J.B., Antweiler, J.C., VanTrump, G., and Hosier, E.L., 1989, Gold, platinum, and silver analytical results and gold signature from the Bonnifield mining district, Fairbanks and Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 89-461, 23 p. Cathrall, J.B., Antweiler, J.C., VanTrump, G., and Hosier, E.L., 1989, Gold analytical results and gold signatures from the Fairbanks mining district, Fairbanks and Livengood quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-490, 32 p.
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, jm 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. 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. Hosier, E.L., 1975, Use of emission spectroscopy for the semiquantitative analysis of trace elements and silver in native gold, jm Ward, F.N., ed., New and refined methods of trace analysis useful in geochemical exploration: U.S. Geological Survey Bulletin 1408, p. 97-105. Smith, P.S., 1941, Fineness of gold from Alaska placers: U.S. Geological Survey Bulletin 910-C, p. 147-272.
TABLE 1.--Index for quadrangle, site, type of sample, locality name, and sample description for lode gold and placer gold from the Anchorage, Charley River, Healy, Iditarod, Juneau, Kt. Hayes, Mt. McKlnley, Ophlr, Ruby, and Talkeetna quadrangles, Alaska Quadrangle name Anchorage Charley River Healy Iditarod Site type Locality name Sample description Willow Creek Unsorted gold. Do Delicate podiform white tipped grains of gold. --Do Plus 20-mesh gold; delicate intricate grains. Do Minus 60-, plus 100-mesh gold.
Do Minus 100-mesh gold. Coal Creek Unsorted gold. Bryn Mawr Creek Unsorted gold. Valdez Creek Unsorted gold. Snow Gulch Minus 20-, plus 60-mesh gold. Do Minus 60-, plus 100-mesh gold. Minus 100-mesh gold. Do Minus 20-, plus 60-mesh gold; very thin flat flakes. --Do Minus 20-, plus 60-mesh gold; nuggety blocky grains. Happy Creek Plus 20-mesh gold. Do Minus 20-, plus 60-mesh gold. Do Crystalline aggregate gold. --Do Crystalline grains. Idaho Mine Plus 20-mesh gold; angular, shiny. Do Minus 20-, plus 60-mesh gold. Prince Creek Plus 20-mesh gold; flat thin flakes. .-Do Minus 20-, plus 60-mesh gold. .-Do Plus 20-mesh gold; gray stains, tiny accretions of gold on surface. Do Minus 20-, plus 60-mesh gold; white to silver amalgam? Do Minus 20-, plus 60-mesh gold; copper colored grains. Black Creek Unsorted gold. Otter Creek Flat grains of gold. Do Minus 20-mesh gold. Granite Creek Plus 20-mesh gold. Do Minus 20-, plus 60-mesh gold. Do Blocky, somewhat crystalline gold. Do Flattened wires of gold. Ganes Creek Whitish gold; amalgam? Golden Horn Lode stockpile Minus 20-, plus 60-mesh gold. Do Minus 60-, plus 100-mesh gold. Do Minus 100-, plus 160-mesh gold. Do Minus 160-mesh gold.
TABLE 1. continued, Quadrangle name Site type Locality name Sample description Juneau Ht. Hayes Ht. HcKinley Ophir Ruby Talkeetna ,01 ,01 Johnson Creek Gold Creek, I Gold Creek, II, right fork Gold Creek, III A-J Glory Hole Treadwell Glory Hole Treadwell Mill Broxson Gulch North Fork Rainy Creek Rainy Creek Do Tertiary gravel, above Miller Gulch Quartz-si ate Creek area Glacier Creek at 22 Gulch, at cabin Do Do Yellow Pup Creek Stampede Creek, below Stampede Mine Ophir Creek Do Do Spruce Creek, I Spruce Creek, II Unsorted gold. Unsorted gold. Unsorted gold. Unsorted gold. Unsorted gold. Minus 35-, plus 100-mesh gold. Plus 35-mesh gold. Unsorted gold. Unsorted gold. Unsorted gold. Unsorted gold. Unsorted gold. Plus 35-mesh gold; nuggets. Flat grains of gold. Grains of platinum. Unsorted gold. Unsorted gold. Plus 35-mesh gold; dirty gold. Unsorted gold. Unsorted gold; somewhat dirty. Plus 35-mesh gold. Gold crystals. Unsorted gold. Minus 20-mesh gold. Plus 20-mesh gold. Minus 100-mesh gold. Unsorted gold. Anvil Creek Unsorted gold. Colorado Creek Unsorted gold. Solomon Creek Unsorted gold. Nugget Creek, Morgans upper bench cut Flattened grains of gold
TABLE 2.--Lower Units of determination for the spectrographic analyses of gold based on a 5-ng sanple Elements Lower determination limit Percent Silver (Ag) Copper (Cu) Zinc (Zn) Gallium (Ga) Lead (Pb) Arsenic (As) Antimony (Sb) Cadmium (Cd) Bismuth (Bi) Indium (In) Mercury (Hg) Tellurium (Te) Nickel (Ni) Cobalt (Co) Tin (Sn) Molybdenum (Mo) Germanium (Ge) Platinum (Pt) Palladium (Pd) Barium (Ba) Strontium (Sr) Zirconium (Zr) Vanadium (V) Chromium (Cr) Yttrium (Y) Lanthanum (La) Scandium (Sc) Niobium (Nb) Boron (B) Tantalum (Ta) Beryllium (Be) Tungsten (W) Manganese (Mn) Iron (Fe) Magnesium (Mg) Calcium (Ca) Titanium (Ti) Silicon (Si)
TABLE 3.*nalyt1cal results for lode fold, placer fold, md fold signatures firm tke Anckorage. Charley River. Mealy. Idltarod. Juneau. Nt. Hayes. Nt. McKlnley. Ophlr. Ruby, and Talkeetna quadrangle*. Alaska (Fine - fineness, where fineness - x 1,000; X - SUB of elements other than gold and silver; AuX 100X - (AgX xX): smpl. wt - sample weight AuX + AgX In Milligram; all element and X values are given In percent; fia. Ge. In. Sc. and Ta analyzed, hut not detected; - not detected; analyst: E.L. Hosier. See table 1 for locality name and sample description which corresponds with cite locality and analysis. N. not detected; detected but below the limit of determination shown; determined to be greater than the value shown.I Sample LATITUDE LONGTUDE SITE AU X FIRE AG X SUH If X CO X ZN X PB 7. AS X SB 7. Anchorage Quadrangle 3236A 3236B 3236VA 3236VE 3236XA 3236XB 3236PJ 3236RB 3236BC 3236SA 3236SB 3236SC fl Of 33 26 3P 26 3P 26 3R 1.0? Charley Piver YD5680A YD5680P YD5680C 65 16 4f. 1.199B Quadrangle
Healey Quadrange 3184A 3184B YD5980A Id it a rod Quadrangle 3305XA 3305XB 3?05XC 3305YA 3305YB 3305Z 3305K 3305LA 3305LB 33P6XA 3306XP 3306YA 3306YP 3306YC 3306KA 3306KB 3306LA 3306LP 62 22 5? 15fl 15fl B.B CD X HO X BI X ,0004 ,0002
Alaska Gold Data--Continued Sample SITF TE ro 3236A 3236P 3236VA 3236VB 3236XA 3236XB 3236PA 3236RB 3236RC 32365A 3236SB 3236SC 1.0? YD5680A YD5680B YD5680C 31R4A 3184B YD5980A 3305XA 3?05X8 3305YA 3305YB 3305Z 3305K 3305LA 3305LP 3306XA 3306XB 3306YA 3306YB 3306YC 3306KA 3306KB 3306LA 3306LB HI % ,0030 ,0005 ,0031 ,0017 ,0009 ,0010 ,0010 ,0014 ,0020 ,0160 ,0972 ,0005 ,0007 ,0019 ,0115 ,0014 ,0019 ,0014 ,0009 ,0011 ,0010 ,0005 ,0028 ,0022 ,0050 CO SN PT 7, PI) 7, BA 7. SP 7. Anchorage Quadrangle--Continued Charley Biver Quadrangle Continued Healey Quadrange Continued ZR CP, T 7. LA % NP 55 ,0106 Iditarod Quadrangle--Continued ,053? ,0006
Alaska Gold Data-~Continued Sample SITE 3236ft 3236F 3236VA 3236VB 32367A 3236XB 3236RA 3236RB 3236RC 3236Sft 3236SB 3236SC YD5680A YD5680B TD5680C 3184A 3184B YD5980A 3305XA 3305XB 3305YJ 3305YB 3305Z 3305K 3305LA 3306XA 3306XP 3306YA 3306YE 3306YC 3306KA 3306KE 3306LA 3306LP 1.0*5 P 7, ,0006 PE HG 7. HN 7, FE HG CA TI SI 75 SHPL WT R=AD/AG AU/CU AG/CU R/CU Anchorage Quadrangle Continued ,0005 ,0004 ,0004 ,0004 ,0004 ,0005 1.052ft .010? .IfOO .014-* .01P3 .510? Charley River Quadrangle Continued Healey Iditarotl
Quad range Continued Quadrangle Continued
5. CO 4,175 2,937 e ,538 1,715 4,060 12,449 11 ,106 4,779 8,927 1,639 1,851 1,837 1,843 1,784 4,190 3,351 2,275 1,476 4,147 4,486 6,260 4,143 3,087 1,535 4,847 4,048 13,457 12,717 9,425 1,900 2,584 2,821 1,905 1,355 2,476 4,205 1,426 1,514 1,000 2,143 2,143 1,000 1,500 1,429 2,143 1,000 1,429
Alaska Gold Data Continued Sample LATITUDE LOHGTUDE SITE AU % FIRF AG SUF X CU ?N T. Iditarod Quadrangle--Continued 3309XA 3309XP. 3309YA 3309YP 3309YC 3308XA 3308XP 330PXC 3308YA 3308YB 3308YC 3308* 3308LA 3308LB 330RLC 3308K 3307A 3307B 3307D 3302XA 3302XB 3302YA 3302YP 3302YC 3303XA 3303YA 3303YB 3303YC 3303KA 3303KP 3303KC 3303LA 3303LB 3081* 30R1P 3081D 3081E 3304XA 3304XB 3304YA 3204YP 6? 6? 21 3P ? ? 26 4
5f f.5 q 9.0? B3.3 8E.7 P4.6 PI. 3 P99 R94 .5*28 5.535B PP 7. AF 7. SP % CD 7. RO 7. BI 7. ,0002 ,0142 ,0003 ,4363 ,0010 ,0150 ,0018 ,0098 ,0054 ,0031 ,0018 ,0074 ,0046 ,0521 ,1020 ,0002 ,0066 ,0005 ,0004 ,0105 ,0065 ,0105 ,0002 .001P .006P ,004f
.OOlf
Alaska Gold Data Continued Sample 3309XA 3309YA 3309YF 3309YC 330PXA 3308XP 3308XT 3308Y* 3308YB 3308YT 3308K 33P8LJ 3308LP 3308H 33P7A 3307D 3302XA 3302XB 3302YA 3302YB 3302YC 3303XA 3303YA 3303YP 3303YC 3303K* 3303KP 3303KC 3303LA 3303LB 3C81A 3D81B 3C81D 3081E 3304X? 3304XB 330*YA 3304YF 3.ni 4.0* 4.P4 7.0? R.ni 8. PI 9.n 9.fl2 HI r. ,0014 ,0010 ,0046 ,0022 ,0005 ,0052 ,0018 ,0010 ,0074 ,0051 ,T023 ,0009 ,0007 ,0009 ,0015 ,0012 ,0021 ,0005 ,0005 ,0009 ,0058 ,0087 005P CO r. SN 7. PT 7. PT) % BA % SB Iditarod Quadrangle--Continued ,0014 .OOOP ,0010 ,0005 ,0005 ,0004 ,0013 ,0005 ,0020 ,0008 ,0021 ,0004 ,0004 ZP 7. CH 7, T LA HP 7. ,0019 ,0021 ,0009 ,0050 ,0019 ,0010 ,0005 ,0010 ,0007 ,0234 ,0052 ,0100 ,0050 ,0008 ,0010 ,0013 ,0007 ,0009 .001*
Alaska Gold Data Continued Sample SITE PE HG HK 7, FF HG CA TI T. SI % SMPL WT R=AU/AG AU/CU AG/CU R/CU Iditarod Quadranole Continued 3309XA 3309XB 3309YA 3309YF 3309YC 3308XA 3308XB 3308YA 3308YB 3308YC 3308K 3308LP 3308LP 3308R 3307A 3307P 3307D 3302XA 3302XP 3302YA 3302YP 3302YC 3303XA 3303XP 3303YA 3303YP 3303YC 3303KA 3303KB 3303KC 3303LA 3303LP 3081A 3081B 30B1C 3081P 30P-1E 3304XA 3304XB 3304YA 3304YB 4.P3 7. PI 7.0? 8.G1 9.0? .1*76 .4R06 5.208? .637P .OOP2 .024R .0*67 .001* .(1047 .01P2 .Pf 00
.617* 5.2P 1,939 2,107 1,992 2,068 6,128 3,042 17,040 1,338 8,450 4,691 4,818 4,430 1,579 11,996 1,514 8,529 2,901 1,905 12,461 3,769 2,662 1,561 2,727 12,?56 8,160 11,488 1,685 30,500 16,084 4,991 3,225 4,788 47,063 15,127 29,656 4,746 6,285 4,516 12,610 7,534 12,607 16,032 16,044 4,416 4,115 7,679 ft, 66 5 5,422 1,000 1,400 1, 000 fOO 2,857 1,OOC 23? 3,000 2,000 1,400 2,000 2,333 2,000 2,500 1,400 1,667 1,786 1,500 1,643 2,700 2,200 1,000 1,000 1,500 1,000 1,000 2,264 7 fl3 4,340 1,480 9,413 1,833 5,696 1,085 1,162 1,168 1,424
Alaska Gold Data-Continued Saiple LATITUDF LOHGTUDE SITE ftO X FINE KG % SOH XT. CO % ZN 7. Tditarod Quadrangle Continued PB
SB r. CD HO 3304YC 3304ZA 3304ZP 33fJ4K P44
Juneau Quadrangle 3049A 3040A 3040B 3042A 3P42B 3041A 3043A 3043B 3093KA 3093HB 3093XA 3P93XB 3050A 3050P 3046A 3047* 3047B YD6779A YD6279A 3096A 3096R 3096SA 3096SP 3096SC 3096P YD4379/1. 58 IP 52 58 IB 5? 58 1R 52 58 IP 55 5P 18 55 58 IP ?7 58 IP 27 58 18 ?7 63 16 ?0.0 7°.3 PI. 6 A6.1 "10 "10 Hount .OOPO .07P7 Hays
Bi
Alaska Gold Data--Continoed Sample SITF TE X 3304YC 3304ZA 3304ZP 3304K 3049A 3040R 3040P 3042A 3042B 3041A 3P43A 3043P 3C93KA 3093MP 3093KC 3C93XA 3093XB 3050A 3050B 3046A 3047A 3047B YD6779A YD6279A 3C96A 3096B 3096SA 3096SB 3096SC 3096? TD4379A 3.ri ,0111 KI X ,0050 ,004" CO X SH X PT X PD x BA X SP X ZR X T X CR % T X LA X KB X ,0005 ,0019 ,OOB9 ,0022 ,0050 ,0015 ,0016 ,1053 Iditarod Quadrangl*--Continued .?3oe Juneau Qaartrangle--Continued .03fl5 ,0034 ,0033 Kount Hays Continued ,0105 ,0309
Alaska Gold Data Continued Sample SITE B BE HG ii HN 7. FE HG CA TI SI X SHPL HT RrAD/AC AD/CO AG/CO R/CO Iditarod Quadrangle--Continned 3304YC 3304ZA 33P4ZB 3304K 3049A 3P40A 3040B 3P42A 3042B 3P42C 3041A 3043* 3P43B 3093HA 3093M8 3093J1C 3P93XA 3093XB 3050* 3050R 3046A 3047A 3047B YP6779A YD6279A 3096A 3096B 3096SA 3096SB 3096SC 3096P TD4379A 2.ni 2. PI 2. PI 5. PI 5.0? 3. PI
--" 3.676? .010? .00*5 Juneau 1.53R5 Quadr8nqle--Con tinned .012? .080? ,02?7 ,1?74
.001? .61LP 4.P4 flount Hays--Continued
?.4 B.9 5,429 5,916 5,013 7,576 3,264 4,154 8,955 5,443 6,576 9,620 8,045 8,528 8,919 8,924 1,307 1,009 1,697 69P 3,135 3,450 2,891 1,908 4,545 1,761 1,923 1,004 1,682 1,949 1,273 2,604 1,000 1,000 1,840 2,400 1,550 2,700 3,929 1,571 3,500 3,357 2,786 1,250 12B 21
Alaska Gold Data Continued Sample LATITUDE LOHGTUDE SITE AU FIHE ro o AG X SUH X % CU X Mount Hays Continued ZH 9! PB AS SB CD HO r. BI YD4379B YD2979A sa
*?ount HcKinley 3062A 3062DA 3062D8 3063A 3063B 30631) 3063XA 3063X.B 3064A 306*C 3064D 3064£ 32 n 6R.9 64? 70S .002?
.014P Ophir Quadrangle 3082ft 7082B 3062D 3082XA 30&2XC 3082XD 3082IE 308EIF YD6780A YD6780B YD6780C YD6780D YD688CA YD66BOB YD688UC ¥068 8 CD YD6980A YD6.9808 t? 6? 7 7 4P 7 4P 2 Q 1.0? £6. 0 8=1.4 B9f 1C.O .3*13
.0*99
004P .00?° .001? ,0019 ,0050 ,0022 ,0059 ,0007 ,0002
Alaska Gold Data--Continned Sample SITF TE W ro YD4379B YDi979A 3062A 3062B 3062DA 3062D8 30S3A 3063P 3063D 3063X* 3063XB 3064A 3064B 3064D 3064E 30B2A 3082B 3CB2C 3062D 3082XA 3082XB 30P2XC 3082XD 3082IE 3082IF YD6780A YD6780B YP6780C YD6780D YD6R80A YD6880B YD6880C Y06880D YD6980A YD6980B 1.0? l.(13 2. PI 3. PI 4. PI CO 7. SN X PT X PD X BA Wount Hays--Continued SR X ZP CR HB X Mount NcXinley ContinuPd Ophir Ouadrancrlp Continued ,0190 ,0005 ,0015 ,0010 ,0030 ,0020 ,0020 ,0010 ,0010 ,0010 ,0010 ,0010 ,0010
Alaska Gold Data Continued Sample SITE BE HG X HB X FE 7? HG % CA TI Hount Hays Continued SI X Sf!PL WT P=AU/AG HO/CD AG/CU B/CD PO ro YD4379B YD2979A 3062A 3062PA 3062D8 3063A 3C63B 3063D 3063XA 3D63XB 3 061 A 3064B 3064D 3064E 3082ft 30R2B 3082D 3082XA 3082XP 3082XP 3082IE 3082IP Y 06 780 A YD6780B YD6780C YD6780D YD6880A YD6880& YD6880C YD68RCD YD6980A YD69BOB 1.0? 1.0? 1.P2 .003*1
--"
"
.7R65 .009P .029? .561P .OOOP Pount .4P73 .0*03 Ophir .B*93 .0?51 flcKin ley-Continued .07P7 ,00?3
.56 IP 1.14P4 .196° Quadrangle Continued .OOP4 .009R
.720? .197? .227P .41P1 4.8f 4.R3 5.9P B.9 7,194 14,993 %947 14,418 20,965 11,284 14,322 11,595 14,010 14,060 29,163 36,258 22,964 27,746 35,224 4,014 4,565 5, 68 2,869 11,016 2,167 6,197 4,276 4,468 4,299 4,f08 4,536 4,597 12,738 15,790 4,455 4,442 5,960 6,638 8,943 17" 6,714 34,000 2,700 8,000 12,000 8,400 5,100 8,400 6,200 5, POO 28,667 23,000 20,000 20,000 26,667 10,000 1,067 1,471 1,133 1,429 4,000 1,000 1,000 f91 1,274 P94
Alaska Cold Data--Continued Sample LATITUDE LONGTUDE SITE AU % FIRE AG X SOU X 7. CO X ZB T. Ophir Quadtanale Continued PB AS SB 7. CD X HO X YD698PC Y&6980D YD7680A YD76BOB YD7680C 3080ft 3080D 3080E 3? P 1" fll.l uby fuadranole .77R9 TalKeetna Quadrangle 3066A 3066B 3066D 3066E 2<? 5f 7P7 74P .001? ,OOOP ,0005 ,0003 ,0083 COOS ,0492 ,0007 ,0050 ,0093 ,0009 ,0007 ,0007 ,0050 ,0030 ,0020 ,0050 Olfifi ,0005 ,0047
Co
Alaska Gold Data Continued Sample SITE TB CO R SN % PT PD R
Ophir Quadranglp Continued SR ZB CR LA 7. NB YD6980C YD6980D YD7680A YP7680B YD7680C 3080A 3080B 3080D 3080E 3 066 A 3066B 3066D 3066E f.Ol Fuhy Oudranole Continued
Talkeetna Quariranale Con tinued
,0010
Alaska Gold Data Continued Sample YD6980C YD69BOO YD7680A YD7680B YD7680C 3080A 3080D 3080E 3066* 3066D 3066E s.ni SITE 8 T. BE % HG X HB 7. FE T. BG % CA X TI Ophir Quadrangle Continued SI r. SHPL HT R=AU/AG AU/CU AG/CU R/CU .OOOf .P058 .OOR3 4.3P Ruby Quadrangle Continued .P020 4. "4 TalKeetna Ouadrangle--Continued
11,404 3,082 11,579 5,706 1,667 4,941 7,136 7,?76 5,697 7,503 7,742 39,967 2,034 2,978 8,120 1,013 ?33 2,143 1,500 2,900 2,100 1,267 2,300 2,100 13,500 1,700 1,408 1,590 ro en