Analytical results and sample locality map of rock-and-soil samples from aerial gamma-ray anomalies, Getchell gold trend, Humboldt County, Nevada

Pitkin, James A. · 1994 · Report

Analytical results and sample locality map of rock-and-soil samples from aerial gamma-ray anomalies, Getchell gold trend, Humboldt County, Nevada By James A.

This 1994 document, Analytical results and sample locality map of rock-and-soil samples from aerial gamma-ray anomalies, Getchell gold trend, Humboldt County, Nevada, is preserved in the Mountain Man Mining Library for research and reference. Original source: pubs.usgs.gov.

U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Analytical results and sample locality map of rock-and-soil samples from aerial gamma-ray anomalies, Getchell gold trend, Humboldt County, Nevada By James A. Pitkin* Open-File Report 94-282 This report is preliminary and has not been reviewed for conformity with U.S.Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S.Government. *U.S. Geological Survey, Denver Federal Center, Box 25046, Mail Stop 964, Denver, CO 80225

TABLE OF CONTENTS Page Introduction 1 Aerial survey 1 Sampling method 1 Description of tables 2 References 3

ILLUSTRATIONS Page Figure 1. Map showing sketched boundary of aerial gamma-ray survey area, gold mines (black dot and name), and towns (black square and name). 6 Plate 1. Map showing sample locations of rock-and-soil samples from aerial gamma-ray anomalies, Getchell gold trend, Humboldt County, Nevada. TABLES Table la. Table ib. Table Ic Table Id, Table le. Table If Table 2a Sample numbers, locations, and descriptions of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. Au, Hg, W, F, and 10-element ICP-AES analyses of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. 9 40-element ICP-AES analysis (partial list) of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. 10 40-element ICP-AES analysis (partial list) of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. 11 40-element ICP-AES analysis (concluding list) of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. 12 Sample numbers, locations, and descriptions of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. 13

Table 2b, Table 2c, Table 2d, Table 2e, Table 2f Table 3a, Table 3b, Table 3c, Table 3d, Table 3e, Table 3f, Table 4a. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of rock-and soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. Au, Hg, W, F, and 10-element ICP-AES analyses of rock-andsoil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. 40-element ICP-AES analysis (partial list) of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. 40-element ICP-AES analysis (partial list) of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. 40-element ICP-AES analysis (concluding list) of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. Sample numbers, locations, and descriptions of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. K, U, and Th concentrations from aerial measurements,K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. Au, Hg, W, F, and 10-element ICP-AES analyses of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. 40-element ICP-AES analysis (partial list) of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. 40-element ICP-AES analysis (partial list) of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. 40-element ICP-AES analysis (concluding list) of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. Sample numbers, locations, and descriptions of soil samples from pediment aerial anomalies in the Getchell gold trend.

Table 4b. Table 4c Table 4d, Table 4e, Table 4f Table 5a. Table 5b. Table 5c. Table 5d, Table 5e. Table 5f. Table 6 K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of soil samples from pediment aerial anomalies in the Getchell gold trend. Au, Hg, W, F, and 10-element ICP-AES analyses of soil samples from pediment aerial anomalies in the Getchell gold trend. . 40-element ICP-AES analysis (partial list) of soil samples from pediment aerial anomalies in the Getchell gold trend. . , 40-element ICP-AES analysis (partial list) of soil samples from pediment aerial anomalies in the Getchell gold trend. . 40-element ICP-AES analysis (concluding list) of soil samples from pediment aerial anomalies in the Getchell gold trend. . , Sample numbers, locations, and descriptions of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Creek mines in the Getchell gold trend. Au, Hg, W, F, and 10-element ICP-AES analyses of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. 33 40-element ICP-AES analysis (partial list) of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. 34 40-element ICP-AES analysis (partial list) of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. 35 40-element ICP-AES analysis (concluding list) of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. 36 Analytical methods, detection limits, and descriptive references for the geochemical analyses described in this report. 37

INTRODUCTION Aerial gamma-ray spectrometer anomalies in the Getchell gold trend of the Osgood Mountains in Humboldt County, Nevada (fig. 1), have been investigated for their significance to gold deposits (Pitkin, 1991b). Ground field work in October and November 1989 and November 1990 obtained rock-and-soil samples for selected anomalies and other geologic features of interest. Geochemical analyses were done on the samples, and this report presents the analytical results. An earlier report (Pitkin, 1991a) described geochemical analyses for most samples collected during the 1989 field season. A final report (Pitkin, in preparation) will discuss all aspects of the investigation, focusing on the utility of aerial gamma-ray measurements in gold exploration. This work is part of the U.S. Geological Survey Getchell gold trend demonstration project (Hoover, Grauch, and others, 1991). The geochemical methods applied to the rock-and-soil samples were proposed by R.W. Leinz of the Branch of Geochemistry, U.S. Geological Survey (oral commun., 1989). AERIAL SURVEY Helicopter-borne gamma-ray spectrometry data for the Getchell project were obtained on 1/4-mile spaced flight lines oriented N 58° W and flown at a nominal 400-ft above ground level. The spectrometer used a 2048 cubic inch sodium iodide detector system to monitor the variation of high energy photopeaks in the uranium-238 and thorium-232 decay series for uranium (U) and thorium (Th) distribution, and the variation of the photopeak of potassium-40 for potassium (K) distribution. Calibration of the spectrometer at sites of known radioelement concentrations (Geodata International, Inc., 1977; Ward, 1978) enabled conversion of observed photopeak variations to quantitative values in parts per million (ppm) for U and Th and percent (%) for K. Equilibrium is assumed in the uranium-238 and thorium-232 decay series. Further details of the aerial survey are given in TerraSense (1989). SAMPLING METHOD To determine locations for field examination and sample collection, radioelement data as U, K, and Th contour maps (TerraSense, 1989) and color composite maps (not published) were examined together with geologic maps (Erickson and Marsh, 1974a; 1974b; Hotz and Willden, 1964; Willden, 1964) for the study area. Locations thought to be anomalous or to have significance for gold deposits were compiled (Pitkin, 1991b), all along aerial flight lines. These locations were visited in the field and rock-and-soil samples were obtained. Where possible, bedrock was sampled rather than soil or non-bedrock locations. Also visited and sampled were geologic targets of opportunity and locations within the Preble, Hansen Creek, and Summer Camp open-pit gold mines. Plate 1 (in pocket) is the sample location map for this study. At sample locations, a portable gamma-ray spectrometer was operated to determine U, K, and Th concentrations and assure location positioning along aerial flight lines and within (mostly) and outside (on occasion) aerial anomalies. The portable spectrometer monitored the same radioisotope photopeaks as the aerial spectrometer (TerraSense, 1989), and was quantitatively calibrated to give concentration values in parts per million (ppm) for U and Th and in percent (%) for K, using a 300-sec counting time. The 3" diameter 3"-thick sodium iodide detector of the spectrometer was suspended within an adjustable tripod 12" to 18" above ground surface. In

-this configuration, gamma-rays detected effectively were from a circular area about 3' in diameter. Detection depth could not be determined, but was probably a maximum of 18". Care was taken to choose locations as flat as possible to achieve as near 2 pi detection geometry as possible. Elevating of the detector results in averaging of minor inhomogeneities at ground surface. Samples were taken from the rock, rock-and-soil, or soil present within the area defined by the tripod. It was not possible to completely sample this area, but comparative results (see tables -b) indicate representative success for most samples. Duval, Reimer, and others (1990) report on a similar investigation that includes the comparison of aerial and ground gamma-ray measurements. DESCRIPTION OF TABLES Tables 1 through 5 are organized on the basis of the rationale for collection of the samples listed in the specific table. Table 1 includes 27 samples collected from bedrock aerial anomaly sites and composed mostly of rock fragments. Table 2 includes 12 samples collected from two areas of gold mineralization and aerial and ground uranium gamma-ray anomalies and composed mostly of rock fragments. Table 3 includes 14 samples collected from an area of known pediment gold mineralization (E.L. Kretschmer, oral commun., 1990) and composed mostly of soil with occasional rock fragments. Table 4 includes 28 samples collected from areas of pediment aerial anomalies and composed mostly of soil with occasional rock fragments. The samples of Table 4 include a set of 3 samples from the same site (90JP044, -45, and -46), where one of the set (-46) was taken from 6" below the surface after the surface samples (-44 and -45) were taken and the intervening material was removed. Five other sets of samples (90JP048 and -49, -50 and -51, -55 and -56, -58 and -59, and -60 and -61) are surface-and-6" depth pairs. The 6" depth sample was taken after the intervening material was removed. Table 5 includes 19 samples collected from the Preble (5), Hansen Creek (8), and Summer Camp (6) open-pit gold mines. These samples were either from drill cuttings (Preble and Summer Camp) or rock fragments (Hansen Creek) from mine workings. Tables 1 through 5 each include -a, -b, -c, -d, -e, and -f parts. In all parts of tables 1 through 5, the dashed line for an element indicates that element was not detected by that analytical method. The -a tables include the field sample number, the laboratory sample number, sample locations in latitude and longitude, a brief description of the physical sample (rock, rock-&-soil, soil), and the sample collection date. The field sample number is listed on each part of each table; these numbers correspond to the numbers shown on the sample location map (plate 1). The -b tables include concentrations of K (%), U (ppm), Th (ppm) as determined by aerial and ground gamma-ray measurements, and delayed neutron activation analyses (dnaa) for U (ppm) and Th (ppm) and the coefficient of variation for each dnaa value. The aerial concentrations are ranges of % and

ppm because they were derived by extrapolation from contour interval intersections plotted along flight lines on l:24,000-scale contour maps prepared by TerraSense (1989). The ground concentrations are single values of % and ppm as they represent single (most often) measurements at aerial anomaly locations. The -c tables include the individual analyses for Au, Hg, W, and F, and the 10-element inductively coupled plasma-atomic emission spectrometry (ICP- AES) analysis, all as described in table 6. The -d, -e, and -f tables include the 40-element inductively coupled plasma-atomic emission spectrometry (ICP-AES) analysis, all as described in table 6. Ag, Au, Bi, Eu, Ho, Sn, Ta, and U are not included in the -d, -e, and -f tables since all analytical results for these elements were below their respective lower determination limits for this analysis. Table 6 lists the analytical methods used in this study, the elements analyzed, their lower detection limits, and the reference that describes the specific method. REFERENCES Briggs, Paul, 1990, Elemental analysis of geological material by inductively coupled plasma-atomic emission spectrometry, in Arbogast, B.F., (ed.), Quality assurance manual for the Branch of Geochemistry, U.S. Geological Survey: U.S. Geological Survey Open-File Report 90-668, p. 83-91. Duval, J.S., Reimer, G.M., Schumann, R.R., Owen, D.E, and Otton, J.K., 1990, Soil gas radon compared to aerial and ground gamma-ray measurements at study sites near Greeley and Fort Collins, Colorado: U.S. Geological Survey Open-File Report 90-648, 42 p. Erickson, R.L., and Marsh, S.P., 1974a, Geologic map of the Golconda quadrangle, Humboldt County, Nevada: U.S. Geological Survey Geologic Quadrangle Map GQ-1174, scale 1:24,000. , 1974b, Geologic map of the Iron Point quadrangle, Humboldt County, Nevada: U.S. Geological Survey Geologic Quadrangle Map GQ-1175, scale 1:24,000. Geodata International Inc., 1977, Lake Meade dynamic test range for calibration of airborne gamma radiation measuring systems: U.S. Department of Energy Open-File Report 83 p. Hoover, D.B., Grauch, V.J.S., Pitkin, J.A., Krohn, D.K., and Pierce, H.A., 1991, An integrated airborne geophysical study along the Getchell trend of gold deposits, north-central Nevada, in Raines, G.L., and others, (eds.), Geology and ore deposits of the Great Basin, symposium proceedings: Geological Society of Nevada, Vol. II, p. 739-758. Hotz, P.E., and Willden, Ronald, 1964, Geology and mineral deposits of the Osgood Mountains quadrangle, Humboldt County, Nevada: U.S. Geological Survey Professional Paper 431, 128 p.

McKown, D.M., and Knight, R.J., 1990, Determination of uranium and thorium in geologic materials by delayed neutron counting, in Arbogast, B.F., (ed.), Quality assurance manual for the Branch of Geochemistry, U.S. Geological Survey: U.S. Geological Survey Open-File Report 90-668, p. 146-150. Motooka, Jerry, 1990, Organometallic halide extraction applied to the analysis of geologic materials for 10 elements by inductively coupled plasma-atomic emission spectrometry, in Arbogast, B.F., (ed.), Quality assurance manual for the Branch of Geochemistry, U.S. Geological Survey: U.S. Geological Survey Open-File Report 90-668, p. 92-96. O'Leary, R.M., Crock, J.G., and Kennedy, K.R., 1990, Determination of mercury in geologic materials by continuous flow-cold vapor-atomic absorption spectrophotometry, in Arbogast, B.F., (ed.), Quality assurance manual for the Branch of Geochemistry, U.S. Geological Survey: U.S. Geological Survey Open-File Report 90-668, p. 60-67. O'Leary, R.M., and Hopkins, D.M., 1990, Determination of fluoride in rock, soil, and stream-sediment samples by ion-selective electrode following Na2CO3-K2CO3-KNO3 fusion and dissolution with citric acid, in Arbogast, B.F., (ed.), Quality assurance manual for the Branch Of Geochemistry, U.S Geological Survey Open-File Report 90-668, p. 127-130. O'Leary, R.M., and Meier, A.L., 1990, Determination of gold in samples of rock, soil, stream-sediment and heavy-mineral-concentrate by flame and graphite furnace atomic absorption spectrophotometry following dissolution by HBr-Br2, in Arbogast, B.F., (ed.), Quality assurance manual for the Branch of Geochemistry, U.S. Geological Survey: U.S. Geological Survey Open-File Report 90-668, p. 46-51. O'Leary, R.M., and Welsch, E.P., 1990, Determination of tungsten in rock, soil, and stream-sediment samples by visible absorption spectrophotometry, in Arbogast, B.F., (ed.), Quality assurance manual for the Branch of Geochemistry, U.S. Geological Survey: U.S. Geological Survey Open-File Report 90-668, p. 157-160. Pitkin, J.A., 1991a, Preliminary results of geochemical analyses of selected aerial gamma-ray anomalies, Getchell trend of gold deposits, Humboldt County, Nevada, in Good, E.E., and others, (eds.), USGS Research on mineral resources 1991 program and abstracts: U.S. Geological Survey Circular 1062, p. 60-61. , 1991b, Radioelement data for the Getchell trend, Humboldt County, Nevada: geologic discussion and possible significance for gold mineralization, in Raines, G.L., and others, (eds.), Geology and ore deposits of the Great Basin, symposium proceedings: Geological Society of Nevada, Vol. II, p. 759-770. Pitkin, J.A., in preparation, Aerial gamma-ray measurements in gold exploration, Getchell gold trend, Humboldt County, Nevada: U.S. Geological Survey Bulletin. TerraSense Inc., with an introduction by J.A. Pitkin and P.L. Hill, 1989, Uranium, potassium, and thorium contour maps derived from a helicopter gamma-ray spectrometer survey of the Getchell Trend, Humboldt County, Nevada: U.S. Geological Survey Open-File Report 89-287, 8 p., 12 sheets, scale 1:24,000.

Ward, D.L., 1978, Construction of calibration pads facility, Walker Field, Grand Junction, Colorado: U.S. Department of Energy Open-File Report 57 p. Willden, Ronald, 1964, Geology and mineral deposits of Humboldt County, Nevada: Nevada Bureau of Mines and Geology Bulletin 59, 154 p.

ijHansen Creek

/ :x Summer Camp AERIAL GAMMA-RAY fc SURVEY iOUNOARY kilomtttts Fig. 1. Map showing sketched boundary of aerial gamma-ray survey area, gold deposits (black dot and name), and towns (black square and name). Shaded areas approximate extent of upland areas. Modified from Pitkin (1991b).

Table la. Sample numbers, locations, and descriptions of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. [Sample locations shown on Plate 1. Calc, effervesed with dilute HC1; do, ditto] Field Lab Location Sample Date Sample Sample Number Number Latitude Longitude Description Collected B9JP001 D344204 40° 56'21.6" 117° 24'51.0" phyllitic shale 19 Oct 89 B9JP002 D344205 40° 56'23.4" 117° 24'55.B" do do B9JP003 D344206 40° 57'54.0" 117° 25'21.0" do & soil do B9JP004 D344207 40° 57'49.8" 117° 25'16.8" do & soil do 89JP005 D344208 40° 57'49.8" 117° 25'12.0" do & soil do 89JP006 D344209 41° 08'09.0" 117° 17'37.2" phyllitic shale 20 Oct 89 89JP007 D344210 41° 08'07.2" 117° 17'32.4" do do 89JP008 D344211 41° 07'55.8" 117° 17'10.8" do/ calc do 89JP009 D344212 41° 05'42.6" 117° 19'31.2" do 21 Oct 89 89JP010 D344213 41° 05'36.6" 117° 19'18.0" do, calc do 89JP027 D344230 41° 04'49.2" 117° 20'20.4" phyllite & 1 Nov 89 quartzite 89JP028 D344231 41° 04'45.0" 117° 20'30.6" vein quartz & do phyllite 89JP029 D344232 41° 04'43.2" 117° 20'30.0" green phyllite do 89JP030 D344233 41° 04'41.4" 117° 20'29.4" do do 90JP001 D371993 41° 06'12.0" 117° 20'51.0" do 1 Nov 90 90JP002 D378638 41° 06'07.8" 117° 20'43.2" gray-black do quartzite 90JP003 D373414 41° 06'06.0" 117° 20'39.0" do do 90JP004 D378646 41° 03'36.0" 117° 22'54.0" soil & rock 2 Nov 90 fragments 90JP005 D378647 41° 03'30.6" 117° 22'45.0" do do 90JP006 D371994 41° 04'12.0" 117° 22'32.4" green phyllite do 90JP022 D373415 41° 05'19.2" 117° 20'03.6" brown & green 4 Nov 90 phyllite 90JP023 D378658 41° 05'17.4" 117° 20'00.0" brown phyllite do 90JP024 D373416 41° OS'21.6" 117° 20'09.6" soil & rock do fragments 90JP026 D378653 41° 05'25.2" 117° 20'16.2" soil do 90JP027 D371995 41° 05'48.0" 117° 20'00.0" soil & rock do fragments 90JP028 D378639 41° 05'40.8" 117° 19'43.8" soil & green do phyllite 90JP029 D371996 41° 05'38.4" 117° 19'39.0" green phyllite do

Table Ib. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. [CV, coefficient of variation; do, ditto] Field Sample Number B9JP001 B9JP002 B9JP003 B9JP004 B9JP005 B9JP006 B9JP007 B9JP008 B9JP009 B9JP010 B9JP027 B9JP028 Aerial concentrations Ground concentrations K,% U,ppm Th,ppm K,% off flight IB20 IB20 IB19 U,ppm Th,ppm U,ppm DNAA Th,ppm CV line 89JP029 89JP030 90JP001 90JP002 90JP003 90JP004 90JP005 90JP006 90JP022 90JP023 90JP024 90JP026 90JP027 90JP028 90JP029 do do not available do do

Table Ic. Au, Hg, W, F, and 10-element ICP-AES analyses of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. [F in %, all others in ppm] r xexa Sample Number 89JP001 89JP002 89JP003 89JP004 89JP005 89JP006 89JP007 89JP008 89JP009 89JP010 89JP027 89JP028 89JP029 89JP030 90JP001 90JP002 90JP003 90JP004 90JP005 90JP006 90JP022 90JP023 90JP024 90JP026 90JP027 90JP028 90JP029 ppm - Au Hg 1 2 2 1 2 2 1 3 1 W

F Ag As Au Bi Cd 2. 4. 6. 5.

Cu Mo Pb Sb

Table Id. Field Sample Number B9JP001 69JP002 B9JP003 B9JP004 B9JP005 B9JP006 89JP007 89JP008 B9JP009 B9JP010 B9JP027 B9JP028 B9JP029 B9JP030 90JP001 90JP002 90JP003 90JP004 90JP005 90JP006 90JP022 90JP023 90JP024 90JP026 90JP027 90JP028 90JP029 40-element ICP-AES analysis (partial list) of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. [Major elements in %, minor in ppm] Al Ca Fe K Mg Na P Ti Mn 5.8 3.5 2.3 2.7 0.54 1.09 0.05 0.2 991.0 6.6 0.2 3.5 2.9 .18 964.0 ppm As Ba Be 592.0 2.0 1150.0 3.0 6.4 0.3 3.1 2.5 .15 320.0 10.0 532.0 2.0 4.3 0.5 7.9 .11 929.0 60.0 384.0 2.0 7.1 2.3 4.8 2.9 .2 1060.0 536.0 2.0 1.1 3.0 2.6 .24 620.0 684.0 2.0 7.9 4.4 2.4 2.9 .33 381.0 912.0 2.0 1070.0 2.0 .24 230.0 50.0 910.0 2.0 .03 226.0 30.0 2910.0 .03 44.0 150.0 408.0 1.0 .02 115.0 250.0 206.0 .11 153.0 100.0 854.0 2.0 78.0 90.0 810.0 2.0 .19 810.0 10.0 750.0 3.0 710.0 3.0 .33 650.0 10.0 900.0 2.0 570.0 10.0 920.0 2.0 .19 230.0 10.0 610.0 3.0 .14 430.0 76.0 1100.0 2.0 .14 280.0 180.0 1100.0 2.0 430.0 92.0 1100.0 2.0 .33 590.0 10.0 840.0 2.0 .36 640.0 920.0 2.0 1.6 2.5 2.3 .33 520.0 10.0 970.0 2.0 .36 640.0 20.0 1100.0 2.0

Table le. 40-element ICP-AES analysis (partial list) of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. [All values in ppm] Field Sample

ppm

Number Cd Ce Co Cr Cu Ga La Li Mo Nb B9JP001 107.0 5.0 14.0 48.0 27.0 9.0 89JP002 71.0 14.0 42.0 14.0 16.0 32.0 15.0 10.0 89JP003 87.0 12.0 50.0 15.0 14.0 38.0 39.0 8.0 89JP004 50.0 18.0 34.0 29.0 10.0 25.0 20.0 6.0 89JP005 10.0 16.0 55.0 26.0 17.0 39.0 21.0 10.0 89JP006 63.0 6.0 12.0 30.0 28.0 10.0 B9JP007 82.0 7.0 70.0 131.0 19.0 46.0 28.0 7.0 21.0 89JP008 37.0 7.0 51.0 53.0 11.0 22.0 12.0 8.0 7.0 B9JP009 74.0 21.0 87.0 9.0 19.0 37.0 57.0 13.0 89JP010 14.0 7.0 14.0 52.0 89JP027 44.0 89JP028 22.0 89JP029 80.0 14.0 42.0 20.0 13.0 33.0 19.0 5.0 89JP030 67.0 4.0 23.0 3.0 9.0 27.0 12.0 90JP001 120.0 19.0 64.0 4.0 19.0 62.0 34.0 4.0 90JP002 49.0 10.0 29.0 32.0 8.0 19.0 11.0 3.0 90JP003 76.0 90JP004 55.0 9.0 38.0 22.0 18.0 31.0 33.0 10.0 90JP005 53.0 9.0 34.0 19.0 17.0 30.0 28.0 10.0 90JP006 120.0 16.0 97.0 8.0 28.0 72.0 62.0 5.0 90JP022 89.0 10.0 48.0 22.0 13.0 41.0 13.0 90JP023 59.0 7.0 45.0 12.0 14.0 29.0 14.0 4.0 90JP024 86.0 53.0 16.0 17.0 45.0 30.0 6.0 90JP026 57.0 10.0 36.0 20.0 16.0 32.0 28.0 10.0 90JP027 72.0 11.0 41.0 21.0 18.0 42.0 28.0 8.0 90JP028 50.0 10.0 41.0 22.0 17.0 30.0 31.0 12.0 90JP029 12.0 44.0 21.0 8.0 45.0 33.0

Table If. 40-element ICP-AES analysis (concluding list) of rock-and-soil samples from bedrock aerial anomaly sites in the Getchell gold trend. [All values in ppm] Field Sample ppm Number Nd Ni Pb Sc Sr Th Y Yb Zn 89JP001 48.0 15.0 24.0 10.0 46.0 23.0 38.0 35.0 4.0 45.0 89JP002 35.0 23.0 30.0 10.0 42.0 13.0 39.0 21.0 2.0 47.0 89JP003 40.0 19.0 73.0 9.0 36.0 26.0 40.0 22.0 2.0 48.0 B9JP004 29.0 30.0 18.0 9.0 100.0 14.0 32.0 18.0 2.0 128.0 B9JP005 42.0 32.0 23.0 12.0 97.0 17.0 47.0 26.0 3.0 92.0 B9JP006 26.0 11.0 16.0 6.0 95.0 14.0 29.0 16.0 2.0 35.0 89JP007 40.0 28.0 9.0 12.0 225.0 15.0 245.0 28.0 3.0 65.0 89JP008 19.0 45.0 4.0 7.0 176.0 7.0 276.0 16.0 2.0 104.0 89JP009 32.0 43.0 16.0 12.0 43.0 16.0 67.0 13.0 2.0 141.0 B9JP010 16.0 15.0 19.0 2.0 771.0 74.0 14.0 89JP027 17.0 5.0 4.0 3.0 35.0 4.0 10.0 11.0 1.0 20.0 B9JP028 89JP029 33.0 15.0 12.0 9.0 61.0 9.0 42.0 19.0 2.0 64.0 89JP030 31.0 7.0 6.0 6.0 39.0 11.0 31.0 16.0 1.0 40.0 90JP001 57.0 31.0 13.0 13.0 47.0 19.0 67.0 26.0 3.0 75.0 90JP002 24.0 19.0 6.0 6.0 68.0 9.0 38.0 18.0 2.0 45.0 90JP003 8.0 3.0 56.0 7.0 19.0 12.0 1.0 90JP004 26.0 14.0 18.0 8.0 310.0 10.0 69.0 20.0 2.0 77.0 90JP005 25.0 12.0 18.0 8.0 320.0 10.0 64.0 19.0 2.0 69.0 90JP006 57.0 45.0 15.0 19.0 78.0 20.0 88.0 12.0 2.0 86.0 90JP022 39.0 20.0 11.0 9.0 48.0 13.0 42.0 19.0 2.0 76.0 90JP023 29.0 15.0 15.0 9.0 91.0 15.0 48.0 19.0 2.0 70.0 90JP024 39.0 20.0 38.0 10.0 130.0 15.0 59.0 20.0 2.0 83.0 90JP026 26.0 23.0 17.0 8.0 280.0 11.0 70.0 19.0 2.0 68.0 90JP027 37.0 15.0 23.0 9.0 330.0 16.0 75.0 22.0 2.0 66.0 90JP028 24.0 15.0 18.0 9.0 320.0 10.0 73.0 20.0 2.0 67.0 90JP029 36.0 16.0 26.0 9.0 340.0 16.0 77.0 21.0 2.0 80.0

Table 2a. Sample numbers, locations, and descriptions of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. [Sample locations shown on Plate 1. do, ditto] Field Lab Location Sample Date Sample Sample Number Number Latitude Longitude Description Collected 90JP030 D373417 41° 13'35.4" 117° 14'13.2" Turquoise Ridge,slate 5Nov90 fragments & soil 90JP031 D373418 41° 13'37.2 H 117° 14'16.2" do do 90JP032 D371997 41° 13'39.6" 117° 14'22.2" do do 90JP033 D371998 41° 13*34.2" 117° 14 I 11.4" do do 90JP034 D373419 41° 13'33.6 lf 117° 14 I 09.0" do do 90JP035 D373420 41° 13'31.2" 117° 14 I 03.0" do do 90JP068 D373426 41° 16'10.2" 117° 12'08.4" red phyllite 7Nov90 fragments & soil 90JP069 D378645 same location do & calcite do fragments 90JP070 D372003 41° 16'02.4" 117° 12'22.8" red phyllite do fragments & soil 90JP071 D372004 41° IS'OO.S" 117° 12'19.8" do & calcite do fragments 90JP072 D373427 41° 16'04.2" 117° 12'25.8" red phyllite do fragments & soil 90JP073 D373428 41° 15'52.8" 117° 12'33.8" do do

Table 2b. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. [CV, coefficient of variation] Field Sample Number 90JP030 90JP031 90JP032 90JP033 90JP034 90JP035 90JP068 90JP069 90JP070 90JP071 90JP072 90JP073 Aerial concentrations K,% U,ppm Th , ppm Ground DNAA concentrations K,% U,ppm Th, ppm U,ppm Th,ppm

Table 2c. Au, Hg, W, F, and 10-element ICP-AES analyses of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. [F in %, all others in ppm] Field ppm % 10-element ICP-AES, ppm Sample Number Au Hg W F Ag As Au Bi Cd Cu Mo Pb Sb Zn 90JP030 0.22 2.4 9.0 0.07 0.23 420.0 0.24 1.1 45.0 5.6 82.0 23.0 77.0 90JP031 .041 1.0 8.0 .078 190.0 .42 32.0 2.4 28.0 19.0 79.0 90JP032

.61 29.0 2.0 15.0 4.0 68.0 90JP033 .097 180.0 .48 43.0 2.5 23.0 8.9 90JP034 .24 250.0 5.1 50.0 11.0 64.0 90JP035 .53 41.0 2.4 24.0 7.6 110.0 90JP068 .28 20.0 3.9 11.0 2.8 77.0 90JP069 .42 76.0 6.3 16.0 6.7 120.0 90JP070 1.9 17.0 3.4 110.0 90JP071 1.4 34.0 4.0 100.0 90JP072 27.0 3.0 30.0 6.2 90JP073 .51 27.0 3.2 11.0 1.7 140.0

Table 2d. 40-element ICP-AES analysis (partial list) of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. [Major elements in %, minor in ppm] Field Sample % ppm Number Al Ca Fe K Mg Na P Ti Mn As Ba Be 90JP030 5.1 1.8 0.6 0.79 0.28 0.18 790.0 380.0 710.0 2.0 90JP031 5.2 720.0 190.0 630.0 2.0 90JP032 7.5 1.8 2.9 2.3 640.0 67.0 1000.0 2.0 90JP033 7.3 1.8 2.8 2.3 620.0 160.0 990.0 2.0 90JP034 4.4 .23 400.0 260.0 620.0 2.0 90JP035 6.6 1.3 640.0 150.0 880.0 2.0 90JP068 5.4 1.3 2.4 2.4 120.0 27.0 450.0 1.0 90JP069 6.0 2.1 3.1 2.5 120.0 44.0 420.0 2.0 90JP070 7.3 1.6 2.9 2.3 .38 630.0 34.0 840.0 2.0 90JP071 7.4 1.9 2.9 2.3 .36 680.0 29.0 850.0 2.0 90JP072 390.0 46.0 590.0 2.0 90JP073 2.3 2.4 2.3 1.2 .24 350.0 31.0 600.0 2.0

Table 2e. 40-element ICP-AES analysis (partial list) of rock-and-soil samples from two areas of gold mineralization and aerial and ground gamma-ray uranium anomalies in the Getchell gold trend. [All values in ppm] Field Sample

ppm

Number Cd Ce Co Cr Cu Ga La Mo Nb 90JP030 60.0 10.0 67.0 51.0 15.0 38.0 25.0 5.0

90JP031 57.0 12.0 43.0 40.0 13.0 32.0 31.0 2.0 90JP032 73.0 12.0 54.0 36.0 19.0 44.0 34.0 90JP033 68.0 11.0 72.0 53.0 18.0 42.0 34.0 4.0 10.0 90JP034 48.0 8.0 64.0 72.0 13.0 30.0 26.0 6.0

90JP035 63.0 12.0 65.0 50.0 16.0 38.0 36.0 2.0 90JP068 54.0 7.0 210.0 23.0 13.0 35.0 45.0 5.0

90JP069 36.0 7.0 440.0 75.0 15.0 25.0 24.0 6.0 90JP070 67.0 11.0 110.0 31.0 17.0 41.0 35.0 2.0 90JP071 63.0 12.0 87.0 31.0 18.0 39.0 36.0 90JP072 56.0 7.0 150.0 33.0 13.0 36.0 24.0 3.0

90Jp073 8.0 210.0 33.0 13.0 36.0 26.0 3.0

Table 2f. 40-element ICP-AES analysis (concluding list) of rock-and-soil samples from two areas of gold mineralization and aerial and ground uranium gamma-ray anomalies sites in the Getchell gold trend. [All values in ppm] Field Sample ppm Number Nd Ni Pb Sc Sr Th Y Yb Zn 90JP030 31.0 32.0 79.0 8.0 450.0 9.0 260.0 24.0 2.0 95.0 90JP031 27.0 25.0 32.0 8.0 210.0 9.0 130.0 19.0 2.0 110.0 90JP032 35.0 26.0 27.0 10.0 330.0 14.0 120.0 22.0 2.0 98.0 90JP033 34.0 24.0 33.0 10.0 390.0 13.0 190.0 22.0 3.0 83.0 90JP034 23.0 34.0 49.0 7.0 320.0 8.0 340.0 20.0 2.0 89.0 90JP035 30.0 30.0 23.0 10.0 240.0 10.0 120.0 22.0 2.0 150.0 90JP068 30.0 43.0 11.0 10.0 63.0 8.0 100.0 17.0 2.0 98.0 90JP069 22.0 69.0 19.0 12.0 90.0 9.0 140.0 20.0 2.0 120.0 90JP070 31.0 36.0 29.0 10.0 290.0 10.0 93.0 22.0 2.0 140.0 90JP071 32.0 34.0 38.0 10.0 300.0 14.0 87.0 21.0 2.0 140.0 90JP072 30.0 40.0 28.0 9.0 150.0 9.0 91.0 22.0 2.0 120.0 90JP073 31.0 55.0 12.0 9.0 150.0 9.0 95.0 25.0 2.0 190.0

Table 3a. Sample numbers, locations, and descriptions of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. [Sample locations shown on Plate 1. do, ditto] Field Sample Number 90JP008 90JP009 90JP010 90JP011 90JP012 90JP013 90JP014 90JP015 90JP016 90JP017 90JP018 90JP019 90JP020 90JP021 Lab Sample Number D372005 D373429 D378648 D373430 D378649 D373431 D373432 D372006 D378650 D378651 D373433 D373434 D378652 D372007 Location Latitude Longitude 41° 41° 41° 41° 41° 41° 41° 41° 41° 41° 41° 41° 41° 41° '28 '22 '19 '14 '09 '45 '42 '37 '34 '28 '23 '18 .2" .8" .2" .4" .0" .6" .0" .6" .4" .2" .2" .8" .4" .0" 117° 117° 117° 117° 117° 117° 117° 117° 117° 117° 117° 117° 117° 117° 14' 13' 13' 13' 13' 14' 14' 14' 13' 14' 13' 13' 13' 13' .4" .0" .0" .4" .0" .2" .4" .0" .8" .4" .2" .4" .0" .0" Sample Date Description Collected Soil and occasional rock fragments do do do do do do do do do do do do do 3Nov90 do do do do do do do do do do do do do

Table 3b. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurments, and delayed neutron activation analyses (dnaa) for U and Th of soil samples from an area of known pediment mineralization in the Getchell gold trend. (CV, coefficient of variation] Field Aerial Ground DNAA Sample concentrations concentrations Number K,% U,ppm Th,ppm K,% U,ppm Th,ppm U,ppm CV Th,ppm CV 90JP008 2.6- 2.5- 11- 90JP009 2.8- 2.0- 12- 90JP010 2.8- 2.0- 12- 90JP011 2.6- 2.0- 13- 90JP012 2.8- 1.5- 12- 90JP013 2.4- 2.0- 11- 90JP014 2.6- 2.5- 90JP015 2.6- 3.0- 11- 90JP016 2.6- 2.5- 90JP017 2.6- 3.0- 11- 90JP018 2.6- 2.5- 11- 90JP019 2.6- 2.5- 12- 90JP020 2.6- 2.5- 90JP021 2.6- 1.5-

Table 3c. Au, Hg, W, F, and 10-element ICP-AES analyses of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. (F in %, all others in ppm] Field ppm % 10-element ICP-AES, ppm Sample Number Au Hg W F Ag As Au Bi Cd Cu Mo Pb Sb Zn 90JP008 0.004 0.22 3.0 0.04 27.0 0.45 23.0 0.93 13.0 1.7 90JP009 .04 0.091 26.0 0.61 .39 21.0 1.3 13.0 0.95 45.0 90JP010 .48 24.0 1.1 90JP011 .085 22.0 .72 12.0 1.0 41.0 90JP012 90JP013 .067 30.0 11.0 1.5 47.0 90JP014 .083 34.0 .74 .46 21.0 1.1 90JP015 .86 12.0 1.7 90JP016

.38 25.0 1.2 90JP017 .051 28.0 .34 24.0 1.2 90JP018 .071 31.0 .61 .43 23.0 1.1 90JP019 .069 28.0 90JP020

.49 22.0 1.2 90Jp021 .69 11.0 1.3

Table 3d. 40-element ICP-AES analysis (partial list) of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. [Major elements in %, minor in ppm] Field Sample % ppm Number Al Ca Fe K Mg Na P Ti Mn As Ba Be 90JP008 7.7 1.9 2.9 2.3 0.88 1.8 0.09 0.39 690.0 34.0 1000.0 2.0 90JP009 7.9 2.4 2.8 2.3 1.0 1.6 0.11 0.35 670.0 38.0 1400.0 2.0 90JP010 7.4 2.3 2.7 2.2 0.99 1.6 0.10 0.36 680.0 30.0 1200.0 2.0 90JP011 7.5 2.6 2.7 2.3 1.2 1.4 0.14 0.34 590.0 34.0 1700.0 2.0 90JP012 7.2 2.4 2.4 2.2 0.86 1.6 0.12 0.33 590.0 34.0 1500.0 2.0 90JP013 7.1 2.7 2.7 2.2 1.1 1.4 0.15 0.31 640.0 34.0 1600.0 2.0 90JP014 7.5 2.4 2.6 2.3 0.88 1.6 0.12 0.31 630.0 36.0 1200.0 2.0 90JP015 7.7 1.9 2.8 2.3 0.81 1.9 0.08 0.39 640.0 39.0 1000.0 2.0 90JP016 7.3 2.7 2.3 0.92 1.5 0.11 0.35 600.0 36.0 1300.0 2.0 90JP017 7.5 2.2 2.7 2.3 0.98 1.6 0.12 0.35 630.0 32.0 1300.0 2.0 90JP018 7.1 2.4 2.6 2.3 0.94 1.5 0.19 0.33 600.0 38.0 1600.0 2.0 90JP019 7.5 2.3 2.7 2.3 0.92 1.6 0.16 0.35 660.0 36.0 1500.0 2.0 90JP020 7.4 2.2 2.6 2.2 0.87 1.7 0.11 0.33 690.0 30.0 1200.0 2.0 90JP021 8.0 2.0 2.7 2.3 0.82 2.1 0.07 0.39 680.0 26.0 1000.0 2.0

Table 3e. 40-element ICP-AES analysis (partial list) of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. [All values in ppm] Field Sample

ppm

Number Cd Ce Co Cr Cu Ga La Mo Nb 90JP008 71.0 11.0 42.0 29.0 19.0 42.0 36.0 10.0 90JP009 73.0 11.0 46.0 28.0 18.0 42.0 36.0 90JP010 62.0 11.0 44.0 26.0 18.0 34.0 36.0 12.0 90JP011 73.0 10.0 53.0 28.0 18.0 43.0 39.0 90JP012 64.0 10.0 41.0 25.0 17.0 37.0 31.0 10.0 90JP013 69.0 10.0 47.0 29.0 18.0 41.0 32.0 90JP014 65.0 10.0 40.0 29.0 18.0 38.0 35.0 90JP015 73.0 11.0 40.0 27.0 18.0 45.0 35.0 11.0 90JP016 64.0 10.0 43.0 28.0 19.0 36.0 37.0 10.0 90JP017 63.0 10.0 42.0 31.0 17.0 38.0 37.0 12.0 90JP018 76.0 11.0 46.0 30.0 17.0 44.0 36.0 90JP019 71.0 11.0 46.0 31.0 18.0 40.0 34.0 90JP020 64.0 10.0 38.0 27.0 18.0 37.0 34.0 10.0 90JP021 70.0 11.0 39.0 23.0 19.0 43.0 35.0 10.0

Table 3f. 40-element ICP-AES analysis (concluding list) of soil samples from an area of known pediment gold mineralization in the Getchell gold trend. [All values in ppm] Field Sample ppm Number Nd Ni Pb Sc Sr Th Y Yb Zn 90JP008 35.0 17.0 23.0 10.0 340.0 13.0 85.0 21.0 2.0 84.0 90JP009 33.0 20.0 16.0 9.0 340.0 12.0 110.0 22.0 2.0 74.0 90JP010 30.0 18.0 17.0 9.0 330.0 11.0 94.0 23.0 3.0 73.0 90JP011 33.0 21.0 15.0 10.0 320.0 12.0 120.0 23.0 2.0 73.0 90JP012 31.0 17.0 18.0 8.0 350.0 10.0 110.0 24.0 2.0 64.0 90JP013 33.0 17.0 13.0 9.0 310.0 11.0 110.0 22.0 2.0 77.0 90JP014 31.0 17.0 17.0 9.0 340.0 9.0 90.0 22.0 2.0 77.0 90JP015 36.0 16.0 24.0 9.0 350.0 13.0 84.0 22.0 3.0 77.0 90JP016 31.0 18.0 18.0 9.0 310.0 12.0 96.0 22.0 2.0 71.0 90JP017 32.0 18.0 17.0 9.0 330.0 9.0 93.0 24.0 2.0 74.0 90JP018 35.0 20.0 14.0 9.0 310.0 10.0 110.0 23.0 2.0 70.0 90JP019 34.0 18.0 15.0 9.0 350.0 12.0 100.0 22.0 2.0 74.0 90JP020 32.0 17.0 16.0 9.0 360.0 12.0 100.0 23.0 2.0 78.0 90JP021 36.0 15.0 20.0 9.0 380.0 14.0 83.0 21.0 2.0 75.0

Table 4a. Sample numbers, locations, and descriptions of soil samples from pediment aerial anomalies in the Getchell gold trend. [Sample locations shown on Plate 1. do, ditto] Field Sample Number 89JP016 89JP017 89JP018 89JP019 89JP020 89JP021 89JP022 89JP023 89JP024 89JP025 89JP026 90JP044 90JP045 90JP046 90JP047 90JP048 90JP049 90JP050 90JP051 90JP052 90JP053 90JP055 90JP056 90JP057 90JP058 90JP059 90JP060 90JP061 Lab Sample Number D344219 D344220 D344221 D344222 D344223 D344224 D344225 D344226 D344227 D344228 D344229 D373435 D373436 D373437 D378654 D372008 D372009 D373438 D373439 D378655 D378656 D373440 D373441 D378657 D372010 D372011 D373442 D373443 Location Latitude Longitude 41° 06'41. 8" 117° 15-03.0" 41° 06-40. 2" 117° 14-54.6" 41° 06-35.4" 117° 14-42.6" 41° 06-07.8" 117° 15-21.0" 41° 06-06.6" 117° 15-18.0" 41° 06-09.6" 117° 15-18.0" 41° 06-09.6" 117° 15-44.4" 41° 06*09.6" 117° 15-39.0" 41° 06'09.0" 117° 16-20.4" 41° 05*48.6" 117° 16-00.0" 41° 05-46.2" 117° 15-54.6" 41° 06-57.6" 117° 15-24.0" same location do 41° 06-50.4" 117° 15-06.6" 41° 06-24.6" 117° 15-18.6" same location 41° 06-21.0" 117° 15-10.2" same location 41° 04-57.0" 117° 16-36.0" 41° 04-51.6" 117° 16-24.6" 41° 04-39.6" 117° 15-58.8" same location 41° 04-34.2" 117° 15-47.4" 41° 04-45.0" 117° 15-33.6" same location 41° 05-30.6" 117° 15-33.0" same location Sample Description soil & occasional rock fragments do do do do do do do do do do rock fragments soil 6" depth, soil & rock fragments soil & rock fragments soil 8" depth, soil soil 6" depth, soil soil soil soil 6" depth, soil soil soil 6" depth, soil soil 6" depth, soil Date Collected 310ct89 do do do do do do do do do do 6Nov90 do do do do do do do do do do do do do do do do

Table 4b. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of soil samples from pediment aerial anomalies in the Getchell gold trend. [CV, coefficient of variation, do, ditto] Field Sample Number 89JP016 89JP017 89JP018 89JP019 89JP020 89JP021 89JP022 89JP023 89JP024 89JP025 89JP026 90JP044 90JP045 90JP046 90JP047 90JP048 90JP049 90JP050 90JP051 90JP052 90JP053 90JP055 90JP056 90JP057 90JP058 On TDORQ 7UJ JrUDy 90JP060 90JP061 Aerial concentrations K,% U,ppm 2.8- 2.53.0 3.0 2.6- 3.02.8 3.5 2.8- 3.03.0 3.5 2.8- 3.03.0 3.5 2.8- 3.03.0 3.5 2.8- 3.03.0 3.5 2.4- 3.02.6 3.5 2.6- 3.02.8 3.5 2.6- 2.02.8 2.5 2.6- 1.52.8 2.0 2.6- 2.02.8 2.5 3.0- 1.03.2 do - none - 2.8- 2.03.0 2.5 2.6- 3.52.8 4.0 none - 3.0- 2.03.2 none - 2.6- 1.52.8 2.0 2.6- 2.02.8 2.5 3.0- 2.53.2 none - 2.8- 2.03.0 2.5 2.8- 3.03.0 none - 2.6- 1.52.8 2.0 none - Th , ppm

Ground DNAA concentrations K,

%

U,ppm - do - none none none Th,

ppm

U,ppm Th , ppm X X . £

Table 4c. Au, Hg, W, F, and 10-element ICP-AES analyses of soil samples from pediment aerial anomalies in the Getchell gold trend. [F in %, all others in ppm] Field ppm % 10-element ICP-AES, ppm - -- Sample Number Au Hg W F Ag As Au Bi Cd Cu Mo Pb Sb Zn 89JP016 0.004 3.0 0.03 0.078 14.0 0.61 0.4 16.0 0.91 13.0 89JP017 .004 3.0 .78 14.0 1.1 49.0 89JP018 .058 11.0 .33 18.0 89JP019 89JP020 .73 16.0 1.1 44.0 89JP021 .002 2.0 89JP022 89JP023 .006 3.5 89JP024 89JP025 .014 3.0 89JP026 90JP044 90JP045 .003 .06 3.0 90JP046 .066 13.0 .7 90JP047 14.0 .35 23.0 1.4 90JP048 .71 11.0 1.4 90JP049 90JP050 .064 28.0 .56 22.0 2.2 11.0 1.8 53.0 90JP051 13.0 .7 .32 28.0 1.6 90JP052 90JP053 90JP055 90JP056 90JP057 .091 11.0 .52 18.0 1.0 90JP058 90JP059 90JP060 90JP061 .049 15.0 .34 29.0 2.1

Table 4d. Field Sample Number 89JP016 89JP017 89JP018 89JP019 89JP020 89JP021 89JP022 89JP023 89JP024 89JP025 89JP026 90JP044 90JP045 90JP046 90JP047 90JP048 90JP049 90JP050 90JP051 90JP052 90JP053 90JP055 90JP056 90JP057 90JP058 90JP059 90JP060 90JP061 40-element ICP-AES analysis (partial list) of soil samples from pediment aerial anomalies in the Getchell gold trend. [Major elements in %, minor in ppm] % ppm Al Ca Fe K Mg Na P Ti Mn As Ba Be 7.2 2.0 2.8 2.5 1.06 1.68 0.11 0.35 650.0 20.0 1080.0 2.0 1.9 2.8 2.5 1.12 1.63 683.0 20.0 1040.0 2.0 1.9 2.7 2.6 1.09 1.67 624.0 20.0 1010.0 2.0 .34 703.0 20.0 1120.0 2.0 1.9 2.7 2.5 716.0 20.0 1580.0 2.0 1.9 2.5 2.4 719.0 20.0 1070.0 2.0 1.9 2.4 2.4 665.0 20.0 1050.0 2.0 684.0 20.0 1010.0 2.0 660.0 20.0 1000.0 2.0 2.0 2.6 2.5 10.0 1050.0 2.0 2.0 2.5 2.5 746.0 20.0 1080.0 2.0 3.4 2.6 2.5 610.0 2.0 2.4 1.6 1.1 620.0 26.0 820.0 2.0 580.0 20.0 820.0 2.0 500.0 20.0 1300.0 2.0 760.0 10.0 1000.0 2.0 510.0 10.0 970.0 2.0 700.0 34.0 1300.0 2.0 570.0 20.0 1000.0 2.0 720.0 10.0 1000.0 2.0 710.0 10.0 1000.0 2.0 1.8 2.4 2.4 .31 710.0 10.0 1500.0 2.0 10.0 980.0 2.0 10.0 1100.0 2.0 860.0 20.0 1300.0 2.0 630.0 20.0 1000.0 2.0 590.0 24.0 1200.0 2.0 2.7 2.6 1.5 7.8 2.0 2.8 2.5 1.8 2.8 2.6 1.8 2.6 2.4 1.8 2.6 2.6 1.6 3.0 2.7 1.0 520.0 22.0 1300.0 2.0

Table 4e. 40-element ICP-AES analysis (partial list) of soil samples from pediment aerial anomalies in the Getchell gold trend. [All values in ppm] Field Sample

ppm

Number Cd Ce Co Cr Cu Ga La Mo Nb 89JP016 77.0 12.0 44.0 24.0 17.0 45.0 33.0 15.0 89JP017 68.0 12.0 47.0 28.0 17.0 40.0 38.0 14.0 89JP018 63.0 12.0 44.0 28.0 16.0 38.0 36.0 12.0 89JP019 59.0 10.0 40.0 20.0 16.0 35.0 32.0 13.0 89JP020 60.0 12.0 43.0 23.0 16.0 35.0 37.0 13.0 89JP021 62.0 10.0 40.0 19.0 16.0 37.0 33.0 15.0 89JP022 64.0 10.0 37.0 18.0 16.0 37.0 28.0 14.0 89JP023 64.0 10.0 40.0 20.0 17.0 37.0 34.0 12.0 B9JP024 67.0 11.0 42.0 21.0 16.0 40.0 32.0 14.0 B9JP025 74.0 11.0 47.0 18.0 16.0 43.0 31.0 15.0 B9JP026 65.0 10.0 41.0 20.0 16.0 37.0 34.0 12.0 90JP044 60.0 13.0 79.0 28.0 19.0 39.0 41.0 8.0 90JP045 65.0 11.0 55.0 31.0 16.0 40.0 36.0 7.0 90JP046 73.0 15.0 58.0 42.0 20.0 44.0 47.0 12.0 90JP047 61.0 10.0 53.0 27.0 17.0 37.0 34.0 9.0 90JP048 71.0 10.0 45.0 20.0 18.0 44.0 37.0 9.0 90JP049 69.0 12.0 51.0 35.0 19.0 43.0 46.0 10.0 90JP050 77.0 10.0 53.0 29.0 18.0 45.0 36.0 7.0 90JP051 71.0 13.0 49.0 36.0 19.0 39.0 41.0 9.0 90JP052 60.0 10.0 40.0 17.0 18.0 34.0 32.0 9.0 90JP053 59.0 10.0 38.0 18.0 17.0 34.0 31.0 10.0 90JP055 67.0 10.0 37.0 19.0 18.0 40.0 32.0 7.0 90JP056 65.0 12.0 44.0 23.0 18.0 38.0 37.0 9.0 90JP057 55.0 9.0 40.0 23.0 18.0 32.0 37.0 10.0 90JP058 65.0 10.0 40.0 21.0 18.0 39.0 35.0 8.0 90JP059 65.0 12.0 43.0 27.0 19.0 39.0 43.0 10.0 90JP060 71.0 11.0 51.0 25.0 16.0 42.0 33.0 7.0 90JP061 76.0 12.0 56.0 36.0 19.0 45.0 39.0 2.0 9.0

Table 4f. 40-element ICP-AES analysis (concluding list) of soil samples from pediment aerial anomalies in the Getchell gold trend. [All values in ppm] Field Sample ppm Number Nd Ni Pb Sc Sr Th Y Yb Zn 89JP016 38.0 19.0 20.0 9.0 332.0 14.0 92.0 22.0 2.0 77.0 89JP017 32.0 19.0 18.0 9.0 326.0 11.0 86.0 21.0 2.0 81.0 89JP018 30.0 20.0 20.0 9.0 326.0 9.0 80.0 20.0 2.0 72.0 89JP019 29.0 15.0 20.0 8.0 352.0 11.0 77.0 19.0 2.0 78.0 89JP020 29.0 18.0 20.0 9.0 351.0 12.0 81.0 19.0 2.0 85.0 89JP021 29.0 16.0 23.0 8.0 358.0 11.0 75.0 19.0 2.0 77.0 89JP022 32.0 15.0 23.0 8.0 349.0 11.0 75.0 19.0 2.0 68.0 89JP023 30.0 16.0 19.0 9.0 347.0 13.0 75.0 20.0 2.0 76.0 89JP024 31.0 17.0 20.0 8.0 338.0 12.0 75.0 19.0 2.0 75.0 89JP025 35.0 18.0 19.0 9.0 332.0 13.0 83.0 21.0 2.0 74.0 89JP026 30.0 17.0 20.0 8.0 338.0 13.0 81.0 20.0 2.0 79.0 90JP044 29.0 32.0 7.0 11.0 200.0 11.0 99.0 16.0 1.0 61.0 90JP045 30.0 22.0 10.0 10.0 220.0 11.0 85.0 19.0 2.0 74.0 90JP046 34.0 28.0 11.0 12.0 230.0 12.0 88.0 21.0 2.0 79.0 90JP047 30.0 19.0 14.0 10.0 330.0 11.0 98.0 23.0 2.0 90JP048 34.0 16.0 23.0 9.0 360.0 14.0 85.0 21.0 2.0 86.0 90JP049 33.0 23.0 23.0 11.0 300.0 14.0 93.0 21.0 2.0 97.9 90JP050 35.0 22.0 14.0 10.0 290.0 12.0 140.0 25.0 2.0 82.0 90JP051 32.0 26.0 15.0 11.0 250.0 12.0 110.0 21.0 2.0 93.0 90JP052 28.0 15.0 19.0 8.0 320.0 11.0 71.0 21.0 2.0 74.0 90JP053 28.0 26.0 20.0 8.0 320.0 11.0 72.0 21.0 2.0 90JP055 31.0 16.0 17.0 8.0 330.0 13.0 72.0 20.0 2.0 78.0 90JP056 30.0 20.0 16.0 9.0 300.0 11.0 80.0 21.0 2.0 86.0 90JP057 27.0 17.0 21.0 9.0 320.0 11.0 78.0 22.0 2.0 85.0 90JP058 30.0 16.0 22.0 9.0 350.0 12.0 78.0 21.0 2.0 84.0 90JP059 32.0 21.0 25.0 10.0 310.0 12.0 88.0 21.0 2.0 97.0 90JP060 33.0 21.0 14.0 9.0 250.0 12.0 98.0 21.0 2.0 83.0 90JP061 35.0 29.0 15.0 11.0 220.0 14.0 140.0 23.0 2.0 100.0

Table 5a. Sample numbers, locations, and descriptions of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. [Sample locations shown on Plate do, ditto] Field Sample Number 89JP011 89JP012 89JP013 89JP014 89JP015 90JP036 90JP037 90JP038 90JP039 90JP040 90JP041 90JP042 90JP043 90JP062 Lab Sample Number D344214 D344215 D344216 D344217 D344218 D373421 D373422 D378640 D378641 D373423 D371999 D372000 D378642 D373424 Location Latitude Longitude 40° 59'45.0" do do do do 41° 11 '47. 4" do do do do do do do 41° 10'45.0" 117° 23'26.5" do do do do 117° 15*04. 2" do do do do do do do 117° 15'01.2" Sample Description Preble mine, drill cutt ings , carbonaceous shale do do do do Hansen Creek mine, rock fragments do do do do do do do Summer Camp mine, Date Collected 22 Oct do do do do 5 Nov do do do do do do do 7 Nov 90JP063 D372001 do 90JP064 D373425 do 90JP065 D378643 do 90JP066 D372002 do 90JP067 D378644 do do do do do do drill cuttings, at site 13651-2-3, Au present from operator analysis do, do, at site do 12568-9-70, Au present, do do, do, at site do 12598-99-600, Au present, do do, do, at site do 12610-1-2, Au not present, do do, do, at site do 12577-8-9, Au present,do do, do, at site do 13301-2-3, Au not present, do

Table 5b. K, U, and Th concentrations from aerial measurements, K, U, and Th concentrations from ground measurements, and delayed neutron activation analyses (dnaa) for U and Th of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. [CV coefficient of variation] Field Aerial Ground Sample concentrations concentrations Number K,% U,ppm Th,ppm K,% U,ppm Th,ppm 89JP011 89JP012 89JP013 89JP014 89JP015 90JP036 90JP037 90JP038 90JP039 90JP040 90JP041 90JP042 90JP043 90JP062 90JP063 90JP064 90JP065 90JP066 90JP067 none none none none none none none none none none none none none none none none none none none U, ppm DNAA CV Th,ppm

Table 5c. Au, Hg, W, F, and 10-element ICP-AES analyses of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. [F in %, all others in ppm.] Field ppm % 10 element ICP-AES, ppm Sample Number Au Hg W F Ag As Au Bi Cd Cu Mo Pb Sb Zn 89JP011 0.044 8.0 0.13 0.41 7.3 22.0 13.0 100 89JP012 1.45 >34.0 .57 4.0 18.0 12.0 49 89JP013 1.4 .43 .47 45 8.0 24.0 13.0 89JP014 1.9 >34.0 .71 2.0 7.4 22.0 11.0 26 89JP015 .37 1.4 19.0 9.0 38 90JP036 2.6 90JP037 1.8 >34.0 46.0 33 12.0 13.0 7.8 160 90JP038 1.4 21.0 42.0 90JP039 16.0 37.0 90JP040 2.7 24.0 53.0 45 17.0 11.0 8.5 340 90JP041 12.0 7.3 550 90JP042 4.3 2.5 170 90JP043 .89 .95 90JP062 2.6 10.8 23.0 90JP063 37 .25 .48 90JP064 3.9 >34.0 180.0 14.0 38.0 68 90JP065 .025 11.0 .43 14.0 2.5 300 90JP066 44.0 7.5 530 90JP067 7.8 3.9 130

Table 5d. 40-element ICP-AES analysis (partial list) of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. [Major elements in %, minor elements in ppm] Field Sample % ppm Number Al Ca Fe K Mg Na P Ti Mn As Ba Be 89JP011 4.8 2.1 2.7 2.4 0.89 0.02 0.58 0.07 125.0 120.0 89JP012 2.0 0.9 18.0 200.0 149.0 1.0 89JP013 2.3 11.0 160.0 119.0 1.0 89JP014 3.6 20.0 210.0 89JP015 16.0 280.0 90JP036 3.3 2.2 2.4 1.2 .16 510.0 510.0 1600.0 1.0 90JP037 3.4 1.5 2.1 1.4 140.0 630.0 850.0 1.0 90JP038 4.6 290.0 730.0 1200.0 2.0 90JP039 5.0 7.1 2.5 2.3 270.0 700.0 870.0 2.0 90JP040 5.4 280.0 1000.0 970.0 2.0 90JP041 3.9 15.0 5.2 1.5 1.2 810.0 490.0 1000.0 2.0 90JP042 5.3 1.2 1.5 76.0 1100.0 90JP043 3.9 17.0 2.1 1.9 1.2 270.0 130.0 1100.0 1.0 90JP062 21.0 230.0 2600.0 1.0 90JP063 40.0 7100.0

90Jp064 7.3 1.0 4.4 3.4 30.0 2800.0 5500.0

90JP065 22.0 1600.0 2.0 90JP066 5.8 200.0 100.0 1600.0 2.0 90JP067 5.8 11.0 3.1 3.0 1.1 .26 820.0 42.0 7400.0 2.0

Table 5e. 40-element ICP-AES analysis (partial list) of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. [All values in ppm] Field Sample Number 89JP011 89JP012 89JP013 89JP014 89JP015 90JP036 90JP037 90JP038 90JP039 90JP040 90JP041 90JP042 90JP043 90JP062 90JP063 90JP064 90JP065 90JP066 90JP067 Cd Ce co Cr P Cu Ga

La Mo

Nb

Table 5f. 40-element ICP-AES analysis (concluding list) of rock or drill cuttings samples from the Preble, Hansen Creek, and Summer Camp mines in the Getchell gold trend. [All values in ppm] Field Sample ppm Number Nd Ni Pb Sc Sr Th Y Yb Zn 89JP011 19.0 50.0 17.0 4.0 188.0 22.0 2.0 128.0 89JP012 12.0 28.0 14.0 137.0 15.0 89JP013 19.0 24.0 18.0 2.0 595.0 208.0 15.0 89JP014 13.0 46.0 14.0 191.0 15.0 89JP015 18.0 57.0 8.0 151.0 6.0 180.0 22.0 90JP036 20.0 130.0 12.0 550.0 17.0 2.0 390.0 90JP037 17.0 65.0 5.0 140.0 6.0 500.0 10.0 90JP038 17.0 110.0 13.0 7.0 200.0 8.0 360.0 14.0 1.0 470.0 90JP039 17.0 72.0 8.0 180.0 7.0 340.0 13.0 1.0 300.0 90JP040 24.0 110.0 13.0 9.0 250.0 7.0 360.0 15.0 1.0 470.0 90JP041 25.0 170.0 7.0 260.0 8.0 160.0 20.0 2.0 720.0 90JP042 27.0 59.0 8.0 240.0 40.0 17.0 2.0 210.0 90JP043 21.0 42.0 6.0 330.0 6.0 120.0 13.0 90JP062 17.0 13.0 16.0 9.0 660.0 10.0 90JP063 90JP064 27.0 17.0 15.0 7.0 420.0 14.0 220.0 16.0 90JP065 19.0 55.0 9.0 110.0 10.0 300.0 15.0 1.0 300.0 90JP066 35.0 130.0 39.0 9.0 100.0 11.0 570.0 17.0 2.0 700.0 90JP067 28.0 50.0 8.0 350.0 10.0 320.0 21.0 2.0 160.0

Table 6. Analytical methods, detection limits, and descriptive references for the geochemical analyses described in this report, [do, ditto] elements analytical method lower detection limit reference u Th Au Hg W Ag As Au Bi Cd Cu MO Pb Sb Zn delayed neutron 0.1 ppm activation analysis do 1.0 ppm graphite furnace 0.002 ppm atomic absorption spectrophotometry continuous flow-cold 0.02 ppm* vapor absorption spectrophotometry visible absorption 0.5 ppm spectrophotometry ion-selective electrode 0.01 % potentiometry inductively coupled 0.045 ppm plasma-atomic emission spectrometry, 10 element, total dissolution do 0.600 ppm do 0.150 ppm do 0.600 ppm do 0.050 ppm do 0.050 ppm do 0.090 ppm do 0.600 ppm do 0.600 ppm do 0.050 ppm McKown and McKnight (1990) do O'Leary and Meier (1990) O'Leary, Crock, and Kennedy (1990) O'Leary and Welsch (1990) O'Leary and Hopkins (1990) Motooka (1990) do do do do do do do do do upper detection limit 34.0 ppm; samples exceeding the working range require dilution for further analysis; see table 5c.

Table 6. (continued) elements analytical method lower detection limit reference Al Ca Fe K Mg Na P Ti Ag As Au Ba Be Bi Cd Ce Co Cr Cu Eu Ga Ho La Mn Mo Nb Nd Ni Pb Sn Sc Sr Ta Th U Y Yb Zn inductively coupled plasma-atomic emission spectrometry, 40 element, partial dissolution do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do 0.005 % 0.005 % 0.005 % % 0.005 % 0.005 % 0.005 % 0.005 % 2 ppm 10 ppm 8 ppm 1 ppm 1 ppm 10 ppm 2 ppm 4 ppm 1 ppm 1 ppm 1 ppm 2 ppm 4 ppm 4 ppm 2 ppm 2 ppm 4 ppm 2 ppm 4 ppm 4 ppm 2 ppm 4 ppm 10 ppm 2 ppm 2 ppm 40 ppm 4 ppm 100 ppm 2 ppm 2 ppm 1 ppm 2 ppm Briggs (1990) do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do do