Regional Geochemical Results 

from the Reanalysis of NURE 

Stream Sediment Samples — 

Eagle 3o

 Quadrangle, East-Central 

Alaska

By J.G. Crock1, P.H. Briggs1, L.P. Gough2, R.B. Wanty1, and Z.A. Brown1

1 U.S. Geological Survey, Box 25046, MS 964D, DFC, Denver, CO 80225-0046. 2 U.S. Geological Survey, 12201 Sunrise Valley Dr, MS 954, Reston, VA 20192-0002 .

Open-File Report 2007-1075 

U.S. Department of the Interior 

U.S. Geological Survey 
U.S. Department of the Interior 

DIRK KEMPTHORNE, Secretary 

U.S. Geological Survey 

Mark D. Myers, Director 

U.S. Geological Survey, Reston, Virginia 2007 

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Suggested citation: 

Crock, J.G., Briggs, P.H., Gough, L.P., Wanty, R.B., and Brown, Z.A., 2007, Regional Geochemical results 

from the Reanalysis of NURE Stream Sediment Samples-Eagle 3o

 Quadrangle, East-Central Alaska: 

USGS Open-File Report 2007-1075. 

Any use of trade, product, or firm names is for descriptive purposes only and does not imply 

endorsement by the U.S. Government. 

Although this report is in the public domain, permission must be secured from the individual 

copyright owners to reproduce any copyrighted material contained within this report. 

ii
Contents 

Abstract................................................................................................................................................................................1 

Introduction .........................................................................................................................................................................1 

Analytical Results and Discussion ..................................................................................................................................3 

Acknowledgments..............................................................................................................................................................4 

References Cited ................................................................................................................................................................4 

Figures 

1. Location of the Eagle 3o Quadrangle and the Fortymile River study area, east-central Alaska ......................2 

2. Comparison of Al, % by ICP-AES and INAA......... ..................................................................................................6 

3. Comparison of Ba, ppm by ICP-AES and INAA.........................................................................................................6 

4a. Comparison of As, ppm by ICP-AES and EDXRF....................................................................................................7 

4b. Comparison of As, ppm by HG-AAS and EDXRF....................................................................................................7 

5. Comparison of Ca, % by ICP-AES and INAA ............................................................................................................8 

6. Comparison of Ce, ppm by ICP-AES and INAA ........................................................................................................8 

7. Comparison of Co, ppm by ICP-AES and INAA ........................................................................................................9 

8. Comparison of Cr, ppm by ICP-AES and INAA.........................................................................................................9 

9. Comparison of Cu, ppm by ICP-AES and EDXRF....................................................................................................10 

10. Comparison of Fe, % by ICP-AES and INAA.........................................................................................................10 

11. Comparison of K, % by ICP-AES and INAA...........................................................................................................11 

12. Comparison of La, ppm by ICP-AES and INAA.....................................................................................................11 

13. Comparison of Mg, % by ICP-AES and INAA .......................................................................................................12 

14. Comparison of Mn, ppm by ICP-AES and INAA...................................................................................................12 

15. Comparison of Na, % by ICP-AES and INAA........................................................................................................13 

16. Comparison of Ni, ppm by ICP-AES and EDXRF...................................................................................................13 

17. Comparison of Pb, ppm by ICP-AES and EDXRF..................................................................................................14 

iii
18. Comparison of Sc, ppm by ICP-AES and INAA ....................................................................................................14 

19. Comparison of Th, ppm by ICP-AES and INAA ....................................................................................................15 

20. Comparison of Ti, % by ICP-AES and INAA..........................................................................................................15 

21. Comparison of V, ppm by ICP-AES and INAA ......................................................................................................16 

22. Comparison of Zn, ppm by ICP-AES and INAA ....................................................................................................16 

Tables 

1. Reporting limits for 39 elements by ICP-AES...........................................................................................................17 

2. Approximate lower determination limits (ppm) for the NURE data .....................................................................18 

3. Analytical results for the Eagle 3o Quadrangle, Fortymile Study Area, Alaska .................................................19

iv
Regional Geochemical Results from the Reanalysis of 

NURE Stream Sediment Samples — Eagle 3o

Quadrangle, East-Central Alaska 

By J.G. Crock, P.H. Briggs, L.P. Gough, R.B. Wanty, and Z.A. Brown 

Abstract 

 This report presents reconnaissance geochemical data for a cooperative study in the Fortymile 

Mining District, east-central Alaska, initiated in 1997. This study has been funded by the U.S. 

Geological Survey (USGS) Mineral Resources Program. Cooperative funds were provided from 

various State of Alaska sources through the Alaska Department of Natural Resources. Results presented 

here represent the initial reconnaissance phase for this multidisciplinary cooperative study. In this 

phase, 239 sediment samples from the Eagle 3o Quadrangle of east-central Alaska, which had been 

collected and analyzed for the U.S. Department of Energy’s National Uranium Resource Evaluation 

program (NURE) of the 1970’s (Hoffman and Buttleman, 1996; Smith, 1997), are reanalyzed by newer 

analytical methods that are more sensitive, accurate, and precise (Arbogast, 1996; Taggart, 2002). The 

main objectives for the reanalysis of these samples were to establish lower limits of determination for 

some elements and to confirm the NURE data as a reliable predictive reconnaissance tool for future 

studies in Alaska’s Eagle 3o Quadrangle. This study has wide implications for using the archived 

NURE samples and data throughout Alaska for future studies. 

Introduction 

A cooperative effort between the U.S. Geological Survey (USGS) and the Alaska Department of 

Natural Resources (AK-DNR) was initiated in 1997 to provide data for addressing water quality concerns, 

as well as for establishing regional baseline geochemical and biogeochemical data. The USGS and the AKDNR have investigated the environmental geochemistry of a portion of the Fortymile River watershed 

(fig. 1). The management of the region and its resources is complex due to diverse ownership and the 

many land-use interests. In 1980, the Fortymile River and its major tributaries were designated a Wild 

and Scenic Corridor by the Alaska National Interest Lands Conservation Act (ANILCA). Jurisdiction 

of the land bordering the watershed continued to be the responsibility of the U.S. Bureau of Land 

Management (USBLM). The AK-DNR has jurisdiction over the management of the river’s recreation 

(rafting, canoeing, and fishing) and mining. The U. s. Environmental Protection Agency (USEPA) is 

also involved because mining discharges require compliance with the National Pollutant Discharge 

Elimination System (NPDES) of the Clean Water Act. Finally, both sport and subsistence hunting are 

important in the region and are managed by several Federal and State agencies. 

1
Figure 1. Location of the Eagle 3o

 Quadrangle and the Fortymile River study area, east-central Alaska. 

Placer gold was first discovered in the Fortymile River Mining District in 1886 and has been 

mined there ever since. Yeend (1996) provides a summary of the gold mining history of the placers of 

the Fortymile River region. Historically from 1886 to 1995, the Fortymile Mining District has produced 

about 16,640 kg (534,974 troy oz.) of gold (Swainbank and others, 1998). Along the North Fork of the 

Fortymile River and just above its confluence with the South Fork, mining is currently limited to a small 

number of suction dredges; their combined production is only a few hundred ounces of gold per year. 

Primary objectives of the completed studies in the Alaska Eagle 3o Quadrangle study were to: 

• Determine the regional baseline geochemistry (waters, soils, rocks, sediments, and selected 

terrestrial vegetation) for a section of the Fortymile River watershed currently being mined for 

placer gold (suction dredge and “cat” or bulldozer operations). 

• Determine regional watershed geochemical fluxes. 

• Assess the influence of geology on water-rock signatures, and using these signatures try to 

differentiate sources of surface and hyporheic water (shallow ground water near a streambed). 

• Determine the movement of metals through ecosystems of specific interest, such as permafrost 

muskeg terrain, upland alluvial forests, and riverine flood-plain shrub systems. 

• Using both a geologic and a hydrologic framework, define the relative contribution of the 

various natural sources of arsenic and cadmium and other environmentally important metals to 

the landscape. 

• Assist the State of Alaska and the USEPA in the arsenic risk-assessment process. 

2
Subsequent to the completion of this reconnaissance phase, the USGS and its cooperators have 

been successful in publishing results from a multidiscipline study of the Fortymile Mining District. 

Gough (2003) gives a complete listing of the products for this study area. Individual references for 

other resultant publications are not listed here. Published studies and analytical results from the 

Fortymile Watershed study area include baseline and background information for soils, fish, vegetation, 

rocks, and water. A revised geological map of the area has also been published. Important to this study’s 

assessment was the evaluation of the flux and biogeochemical cycling of arsenic and cadmium between 

the terrestrial and aquatic phases. In addition to studying water-rock processes that mobilize arsenic and 

cadmium, this project is also examining other factors that affect their bioavailability to the environment 

(for example, in sites that are mined versus unmined, vegetated versus barren, saturated (permafrost) 

versus drained, or forested versus muskeg). 

 The NURE samples represent an almost complete statewide sampling of Alaska. These samples 

are archived by the USGS in Denver and are available for future studies. Weaver (1983) presents a 

geochemical atlas for the state of Alaska based on the samples collected and analyzed. The U.S. 

Department of Energy’s national laboratory at Los Alamos (New Mexico) was charged with the 

responsibility of sample collection, analysis, data processing, and interpretation for Alaska. Other 

national laboratories were responsible for other parts of the continental United States. NURE samples 

in Alaska were collected between 1975 and 1979, when funding stopped. As a result, only about 80 

percent of the state was sampled (Weaver, 1983). Sample density of stream and lake sediments and 

water ranged between one sample per 10 km2

 (4 mi2) and 23 km2 (99 mi2) for a total of 61,923 sediment 

samples collected; of these, 38,021 are small stream sediment samples and 23,902 are small lake 

sediment samples (Weaver, 1983). Smith (1997) has a total of 62,670 Alaska NURE sediments (not 

including special study samples) broken down into 24,227 lake or pond sediments, 38,216 stream 

sediments, 117 spring sediments, and 110 stream-bank sediments. The total number of Alaska NURE 

sediments samples (including orientation and detailed follow-up studies) found in Smith (1997) is 

65,109, consisting of 24,284 lake or pond sediments, 40,598 stream sediments, 117 spring sediments, 

and 110 stream-bank sediments. Sample analysis was performed using a variety of analytical methods 

that had lower detection limits that were usually less than the crustal abundance for most elements. 

Because uranium was the primary focus of the NURE program, a very sensitive delayed neutron 

activation analysis method (0.01 mg U/kg, detection limit) was used for its determination. As a result 

more than 99.9 percent of the samples had detectable uranium. In contrast, both selenium and silver 

were detected in about 0.3 percent of the samples with a limit of detection of 5 mg Se or Ag/kg. Alaska 

NURE data are available in digital format from Hoffman and Buttleman (1996) and Smith (1997). 

Analytical Results and Discussion 

 This reconnaissance study of the Eagle 3o Quadrangle of east-central reanalyzed 239 NURE 

sediment samples by the more sensitive methods currently employed by the laboratories of the USGS, 

Denver, Colo. (Arbogast, 1996; Taggart, 2002). Table 1 lists the reporting limits of 39 elements as 

determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) in the USGS 

laboratories after an open vessel, multi-acid digestion. Arsenic and antimony were also determined with 

a more sensitive hydride generation – atomic absorption technique (Arbogast, 1996; Taggart, 2002). 

The lower limit of determination for these methods is 0.2 mg/Kg total arsenic or antimony. Table 2 lists 

the approximate lower determination limits for the NURE data and the methods of analysis for 

3
individual elements (Weaver, 1983). Table 3 is a listing of sample identification, location, and side-byside listings of the NURE data from Hoffman and Buttleman (1996) and the new data from this study. 

Figures 2 – 22 are simple plots of the previously reported NURE data versus the new data of this 

study. Simple regression equations and regression coefficients were calculated and are listed only for 

those data pairs where sufficient uncensored data were available. In general, the two data sets compare 

very favorably. Two indicators of how similar two data sets can be observed with a simple regression 

analysis by observing the regression equation and the correlation coefficient. The first is the slope of 

the equation, or the multiplier of the “x” term. The closer the slope is to one, the closer the data ratios 

are 1:1, thus, the closer the two sets are to each other. The second indicator of data similarity is the 

square of the correlation coefficient. This is an indication of how much of the variation seen between 

the two data sets is explained by other data points in the data pair. The closer this number is to one, the 

more the variation explained, with one indicating 100 percent of the variation explained. Additionally, 

the magnitude of the constant, or “y” axis intercept, is an indication of method bias - the smaller the 

constant value, the smaller the bias between the methods. The intercept of the regression line is an 

indication of method bias. The closer the intercept is to zero, the lower the method’s bias will be. Since 

there is a good agreement between the two data sets for most elements, there should be a high level of 

confidence in using the original NURE data as an initial assessment of a new study area when the 

element of interest is at a high enough concentration to be determined by the older NURE methods. An 

example of an element of concern is zinc. Since the NURE data have a lower detection limit of 100 

mg/kg, many samples will have censored values or values not significantly higher than the lower limit 

of detection, since the crustal abundance of zinc is about 70 mg/kg and is commonly less than that in 

many soil samples. This concern is shown in figure 22 where the slope is much less that one, the 

intercept (bias) is large, and the regression coefficient is small. Only cobalt shows an odd-looking plot, 

possibly showing a bimodal distribution of the original NURE data. This could be explained by a 

change of methods or some other operational bias in the NURE data. Since the new cobalt data from 

this study were determined using one method, one operator, and over a relatively short period of time, it 

is probably more reliable and less problematic than the NURE data. 

Acknowledgments 

The authors wish to thank Richard O’Leary and Stephen Smith, USGS, Denver, Colo., for their 

helpful reviews of this work. 

References Cited 

Arbogast, B.F., ed., 1996, Analytical methods manual for the Mineral Resource Surveys Program, U.S. 

Geological Survey: U.S. Geological Survey Open-File Report 96-525, 248 p. 

Gough, L. P., ed., 2003, Selected geochemical and biogeochemical studies of the Fortymile River 

Watershed, Alaska: U.S. Geological Survey Professional Paper 1685, 54 p. 

Hoffman, J.D., and Buttleman, K., 1996, National Geochemical Data Base—National Uranium 

Resource Evaluation (NURE) hydrogeochemical and stream sediment reconnaissance (HSSR) 

data for Alaska and the conterminous United States: U.S. Geological Survey Digital Data Series 

DDS-18-B (CD ROM). 

4
Smith, S.M., 1997, National Geochemical Database - Reformatted data from the National Uranium 

Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) 

Program, Version 1.40 (2006): U.S. Geological Survey Open File Report 97-492, WWW 

release only, URL: http://pubs.usgs.gov/of/1997/ofr-97-0492/index.html. 

Swainbank, R.C., Clautice, K.H., and Nauman, J.L., 1998, Alaska’s Mineral Industry – 1997: Alaska 

Department of Natural Resources Division of Geological and Geophysical Surveys Special 

Report 52, 65 p. 

Taggart, J.E., ed., 2002, Analytical methods for chemical analysis of geologic and other materials, U.S. 

Geological Survey: U.S. Geological Survey Open-File Report 02-223, pages not numbered 

consecutively: http://pubs.usgs.gov/of/2002/ofr-02-0223/. 

Weaver, T.A., 1983, The geochemical atlas of Alaska: Compiled by the Geochemistry Group, Earth 

Sciences Division, Los Alamos National Laboratory, Los Alamos New Mexico 87545, Report 

GJBX-32 (83), 57 p. 

Yeend, W., 1996, Gold placers of the historical Fortymile River region, Alaska: U.S. Geological 

Survey Bulletin 2125, 75 p. 

5
y = 1.0064x + 0.2443

R2

 = 0.9025

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

0.00 2.00 4.00 6.00 8.00 10.00

INAA Al, %

ICP-AES Al, %

Figure 2. Comparison of Al, % by ICP-AES and INAA.

y = 0.8144x + 140.37

R2

 = 0.779

0

500

1000

1500

2000

2500

0 500 1000 1500 2000 2500

INAA Ba, ppm

ICP-AES Ba, ppm

Figure 3. Comparison of Ba, ppm by ICP-AES and INAA 

6
y = 0.7112x + 4.0438

R2

 = 0.7962

0

10

20

30

40

50

60

0 10 20 30 40 50 60 70

EDXRF As, ppm

ICP-AES As, ppm

Figure 4a. Comparison of As, ppm by ICP-AES and EDXRF. 

y = 0.8111x - 1.4515

R2

 = 0.818

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

0 10 20 30 40 50 60 70

EDXRF As, ppm

HG-AAS As, ppm

Figure 4b. Comparison of As, ppm by HG-AAS and EDXRF. 

7
y = 1.0375x - 0.0677

R2

 = 0.9489

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

0.00 1.00 2.00 3.00 4.00 5.00 6.00

INAA Ca, %

ICP-AES Ca, %

Figure 5. Comparison of Ca, % by ICP-AES and INAA.

y = 0.8626x + 7.6273

R2

 = 0.8633

0

50

100

150

200

250

300

350

0 50 100 150 200 250 300 350

INAA Ce, ppm

ICP-AES Ce, ppm

Figure 6. Comparison of Ce, ppm by ICP-AES and INAA.

8
y = 0.273x + 11.897

R2

 = 0.1928

0

10

20

30

40

50

60

70

80

90

100

0 20 40 60 80 100

INAA Co, ppm

ICP-AES Co, ppm

Figure 7. Comparison of Co, ppm by ICP-AES and INAA.

y = 1.0217x + 17.475

R2

 = 0.8423

0

50

100

150

200

250

300

350

0 50 100 150 200 250

INAA Cr, ppm

ICP-AES Cr, ppm

Figure 8. Comparison of Cr, ppm by ICP-AES and INAA.

9
y = 0.7561x + 3.0247

R2

 = 0.7472

0

20

40

60

80

100

120

0 20 40 60 80 100 120

EDXRF Cu, ppm

ICP-AES Cu, ppm

Figure 9. Comparison of Cu, ppm by ICP-AES and EDXRF. 

y = 0.9398x + 0.324

R2

 = 0.9595

0.0

2.0

4.0

6.0

8.0

10.0

12.0

0.00 2.00 4.00 6.00 8.00 10.00 12.00

INAA Fe, %

ICP-AES Fe, %

Figure 10. Comparison of Fe, % by ICP-AES and INAA.

10
y = 0.6842x + 0.4546

R2

 = 0.6852

0.0

0.5

1.0

1.5

2.0

2.5

3.0

0.00 0.50 1.00 1.50 2.00 2.50 3.00

INAA K, %

ICP-AES K, %

Figure 11. Comparison of K, % by ICP-AES and INAA.

y = 0.9951x + 1.2959

R2

 = 0.8706

0

20

40

60

80

100

120

140

160

180

0 20 40 60 80 100 120 140 160

INAA La, ppm

ICP-AES La, ppm

Figure 12. Comparison of La, ppm by ICP-AES and INAA.

11
y = 1.3847x - 0.1494

R2

 = 0.8602

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50

INAA Mg, %

ICP-AES Mg, %

Figure 13. Comparison of Mg, % by ICP-AES and INAA.

5.00

y = 0.9848x - 7.1956

R2

 = 0.9802

0

1000

2000

3000

4000

5000

6000

0 1000 2000 3000 4000 5000 6000

INAA Mn, ppm

ICP-AES Mn, ppm

Figure 14. Comparison of Mn, ppm by ICP-AES and INAA.

12
y = 1.0104x + 0.0505

R2

 = 0.9225

0.00

0.50

1.00

1.50

2.00

2.50

3.00

0.00 0.50 1.00 1.50 2.00 2.50 3.00

INAA Na, %

ICP-AES Na, %

Figure 15. Comparison of Na, % by ICP-AES and INAA.

y = 1.0148x + 5.4379

R2

 = 0.8519

0

20

40

60

80

100

120

140

160

180

0 20 40 60 80 100 120 140 160

EDXRF Ni, ppm

ICP-AES Ni, ppm

Figure 16. Comparison of Ni, ppm by ICP-AES and EDXRF. 

13
y = 1.0261x + 3.9289

R2

 = 0.5833

0

10

20

30

40

50

60

0 5 10 15 20 25 30 35 40

EDXRF Pb, ppm

ICP-AES Pb, ppm

Figure 17. Comparison of Pb, ppm by ICP-AES and EDXRF. 

y = 1.0496x - 0.207

R2

 = 0.9344

0

5

10

15

20

25

30

35

40

0 5 10 15 20 25 30 35 40

INAA Sc, ppm

ICP-AES Sc, ppm

Figure 18. Comparison of Sc, ppm by ICP-AES and INAA.

14
y = 1.1457x - 1.1363

R2

 = 0.8339

0

5

10

15

20

25

30

35

40

45

50

0 5 10 15 20 25 30 35 40

INAA Th, ppm

ICP-AES Th, ppm

Figure 19. Comparison of Th, ppm by ICP-AES and INAA.

y = 0.909x + 0.0198

R2

 = 0.7905

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40

INAA Ti, %

ICP-AES Ti, %

Figure 20. Comparison of Ti, % by ICP-AES and INAA.

15
y = 1.00779x + 1.3455

R2

 = 0.9128

0

50

100

150

200

250

300

0 50 100 150 200 250 300

INAA V, ppm

ICP-AES V, ppm

Figure 21. Comparison of V, ppm by ICP-AES and INAA.

y = 0.5366x + 30.695

R2

 = 0.4906

0

100

200

300

400

500

600

0 100 200 300 400 500 600 700

INAA Zn, ppm

ICP-AES Zn, ppm

Figure 22. Comparison of Zn, ppm by ICP-AES and INAA.

16
Table 1. Reporting limits for 39 elements by ICP-AES (Arbogast, 1996) 

Element Concentration range 

Silver, Ag 2 10,000 ppm 

Aluminum, Al 0.005 50 % 

Arsenic, As 10 50,000 ppm 

Gold, Au 8 50,000 ppm 

Barium, Ba 1 35,000 ppm 

Beryllium, Be 1 5,000 ppm 

Bismuth, Bi 10 50,000 ppm 

Cadmium, Cd 2 25,000 ppm 

Calcium, Ca 0.005 50 % 

Cerium, Ce 5 50,000 ppm 

Cobalt, Co 2 25,000 ppm 

Chromium, Cr 2 50,000 ppm 

Copper, Cu 2 15,000 ppm 

Europium, Eu 2 5,000 ppm 

Iron, Fe 0.02 25 % 

Holmium, Ho 4 5,000 ppm 

Potassium, K 0.01 50 % 

Lanthanum, La 2 50,000 ppm 

Lithium, Li 2 50,000 ppm 

Magnesium, Mg 0.005 5 % 

Manganese, Mn 4 50,000 ppm 

Molybdenum, Mo 2 50,000 ppm 

Sodium, Na 0.006 50 % 

Niobium, Nb 4 50,000 ppm 

Neodymium, Nd 9 50,000 ppm 

Nickel, Ni 3 50,000 ppm 

Phosphorous, P 0.005 50 % 

Lead, Pb 4 50,000 ppm 

Scandium, Sc 2 50,000 ppm 

Tin, Sn 5 50,000 ppm 

Strontium, Sr 2 15,000 ppm 

Tantalum, Ta 40 50,000 ppm 

Thorium, Th 6 50,000 ppm 

Titanium, Ti 0.005 25 % 

Uranium, U 100 100,000 ppm 

Vanadium, V 2 30,000 ppm 

Yttrium, Y 2 25,000 ppm 

Ytterbium, Yb 1 5,000 ppm 

Zinc, Zn 2 15,000 ppm 

17
Table 2. Approximate lower determination limits (ppm) for the NURE data (Weaver, 1983) 

Element Analytical Method* Lower Detection Limit (ppm)** 

Aluminum, Al INAA-S 3200 

Arsenic, As EDXRF 5 

Gold, Au INAA-L 0

Barium, Ba INAA-S 150 

Bismuth, Bi EDXRF 5 

Calcium, Ca INAA-S 1000 

Cerium, Ce INAA-L 1

Cobalt, Co INAA-L 1.7 

Chromium, Cr INAA-L 1

Cesium, Cs INAA-L 2

Copper, Cu EDXRF 10 

Dysprosium, Dy INAA-S 0.7 

Europium, Eu INAA-L 0.4 

Iron, Fe INAA-L 1100 

Hafnium, Hf INAA-L 1

Potassium, K INAA-S 3400 

Lanthanum, La INAA-L 7 

Lutetium, Lu INAA-L 0.1 

Magnesium, Mg INAA-S 2700 

Manganese, Mn INAA-S 55 

.05 

0 

0 

.3 

Sodium, Na INAA-S 1000 

Niobium, Nb INAA-L 20 

Nickel, Ni EDXRF 15 

Lead, Pb EDXRF 5 

Antimony, Sb INAA-L 1 

Scandium, Sc INAA-L 0.9 

Strontium, Sr INAA-S 400 

Tantalum, Ta INAA-L 1 

Terbium, Tb INAA-L 1 

Thorium, Th INAA-L 1 

Titanium, Ti INAA-S 750 

Uranium, U DNC 0.01 

Vanadium, V INAA-S 6 

Ytterbium, Yb INAA-L 1 

Zinc, Zn INAA-L 100 

Zirconium, Zr EDXRF 5 

*INNA-L, Instrumental neutron activation analysis, long count; INNA-S, Instrumental neutron analysis, short count; 

EDXRF, energy dispersive x-ray fluorescence; DNC, delayed neutron counting. 

**The lower detection limits for INAA are a complex function of sample composition and weight. Presented here are the 

lower detection limits that are average values calculated from a typical 4 g sample (Weaver, 1983). 

18
Table 3: Analytical results for the Eagle 3 o Quadrangle, Fortymile Study Area, AK (previous NUR

Al, % Al, % As, ppm As, ppm As, ppm Au, ppm Ba, ppm Ba, ppm 

 INAA ICP-AES EDXRF ICP-AES HG-AAS INAA INAA ICP-AES 

438791 64.0731 -141.9706 7.18 7.5 13 <10 9.7 <0.04 1071 920 438792 64.0750 -141.9247 6.76 7.5 <5 <10 5.8 <0.07 842 830 438793 64.0706 -141.9017 7.29 7.6 15 <10 6.3 <0.06 858 800 438794 64.0750 -141.8689 7.11 7.5 8 <10 7.5 <0.09 478 570 438795 64.0728 -141.8456 6.73 7.3 17 11 11 <0.05 706 630 438796 64.0694 -141.8278 6.74 7.4 16 13 10 <0.10 872 530 438797 64.0500 -141.7839 6.62 6.9 11 <10 4.7 <0.07 911 790 438798 64.0581 -141.7508 6.91 8.0 6 <10 4.2 <0.09 767 860 438799 64.0747 -141.7342 6.75 7.1 8 <10 3.8 <0.04 884 820 438800 64.0817 -141.6089 7.05 7.2 13 <10 12 <0.12 1399 1300 438801 64.0978 -141.5744 6.58 6.9 10 <10 5.3 <0.07 1081 970 438802 64.1247 -141.5556 7.00 7.0 6 <10 5.8 <0.10 1245 1200 438803 64.0447 -141.9042 7.25 7.9 7 <10 7.8 <0.05 873 940 438804 64.0297 -141.8256 6.98 7.7 5 <10 4.7 <0.08 793 680 438806 64.0389 -141.1889 6.64 7.2 10 15 10 <0.07 1186 1200 438807 64.0631 -141.2419 6.28 6.6 13 12 9.1 <0.08 1114 1100 438809 64.0639 -141.3667 6.89 8.2 26 20 16 <0.06 1441 1400 438810 64.0544 -141.4125 6.49 6.6 11 12 9.6 <0.09 1125 1100 438811 64.0456 -141.4125 4.08 3.8 8 <10 5.0 <0.11 998 700 438812 64.0331 -141.4947 6.47 6.2 6 <10 6.0 <0.13 1082 990 438813 64.0347 -141.4756 4.74 4.4 <5 <10 1.8 <0.06 853 680 438814 64.0425 -141.5756 6.96 6.6 18 15 11 <0.10 1476 1100 438816 64.0694 -141.6186 6.68 7.2 8 <10 8.6 <0.08 1155 1100 438817 64.0694 -141.7631 3.79 3.5 <5 <10 2.3 <0.14 <392 400 438818 64.0639 -141.8264 7.08 7.5 6 <10 5.9 <0.05 959 850 438819 64.0558 -141.9281 7.24 7.3 <5 <10 5.5 <0.08 837 720 438820 64.0664 -141.9722 7.03 7.5 <5 <10 5.1 <0.07 864 740 438821 64.0669 -142.0153 7.40 7.5 5 <10 7.3 <0.10 579 800 438822 64.0531 -142.0697 7.03 7.5 <5 <10 4.9 <0.05 806 780 438823 64.0628 -142.1472 6.95 7.3 7 <10 5.0 <0.08 863 780 438824 64.0592 -142.1706 6.91 7.1 6 <10 5.1 <0.07 802 780 438829 64.0647 -141.1686 6.56 6.4 5 <10 11 <0.09 1299 1200 438831 64.0964 -142.0958 2.34 2.3 <5 <10 1.7 <0.19 <313 290 438832 64.0786 -142.1392 6.65 6.3 12 <10 7.5 <0.08 942 660 438833 64.0892 -142.1931 7.14 7.0 6 <10 6.6 <0.10 603 670 438872 64.1306 -142.1886 6.08 5.9 16 <10 13 <0.11 724 600 

Sample ID Latitude Longitude

1
438791

438792438793438794438795438796438797438798438799438800438801438802438803438804438806438807438809438810438811438812438813438814438816438817438818438819438820438821438822438823438824438829438831438832438833438872

Sample ID Ce, ppm Co, ppm Co, ppm Cr, ppm Cr, ppm Cs, ppm Cu, ppm Cu, ppm Dy, ppm Eu, ppm 

ICP-AES INAA ICP-AES INAA ICP-AES INAA EDXRF ICP-AES INAA INAA 

83 14 14 72 77 3.4 28 16 6 1.1 85 33 23 114 110 <1.9 25 21 7 1.9 64 17 15 77 89 <1.7 38 20 3 1.5 52 15 17 91 96 <2.6 35 29 4 1.3 36 15 19 63 90 <1.4 30 19 4 1.0 36 38 20 101 140 <2.8 45 39 5 1.3 50 19 21 78 86 <1.9 62 34 4 1.2 52 21 23 72 100 <2.3 50 33 4 1.3 40 11 14 75 89 2.3 31 25 3 0.9 68 45 22 87 120 <3.3 68 50 6 1.7 59 16 15 62 84 <2 23 22 5 1.4 46 18 19 68 83 <2.7 25 23 4 0.9 91 15 17 80 96 <1.4 17 17 5 1.5 50 30 15 86 98 <2.2 21 19 4 1.5 52 23 21 171 210 4.4 29 30 4 1.4 44 15 18 203 230 3.5 15 21 5 1.1 56 22 25 157 200 5.9 50 50 5 1.1 48 32 19 137 160 <2.4 35 24 4 1.3 48 24 22 62 81 <3.1 46 45 <3 1.4 49 11 14 124 130 <3.6 37 39 4 1.8 40 10 12 78 89 <1.9 34 32 4 1.0 54 37 21 127 150 <2.8 33 32 6 1.4 48 21 20 110 150 4.2 32 27 5 1.2 23 <2.9 8 <22 47 <3.5 42 40 3 <0.7 47 11 15 70 97 2.7 39 33 4 1.1 61 31 16 84 84 <2.3 19 19 4 1.4 74 19 19 71 85 <1.9 15 17 4 1.4 76 18 20 85 100 <2.6 18 19 5 1.5 51 14 16 84 92 3.1 17 24 5 1.1 51 29 14 88 95 <2.3 24 20 4 1.4 49 16 15 79 92 2.1 21 26 5 1.4 51 18 20 176 200 5.6 26 25 5 1.4 19 71 13 <28 40 <4.7 22 24 <2 <0.9 42 17 13 78 86 <2.2 31 34 4 1.2 43 13 16 82 81 <2.7 21 29 4 1.1 43 46 17 69 85 <4 21 24 3 0.7 

2
438791

438792438793438794438795438796438797438798438799438800438801438802438803438804438806438807438809438810438811438812438813438814438816438817438818438819438820438821438822438823438824438829438831438832438833438872

Sample ID K, % La, ppm La, ppm Li, ppm Lu, ppm Mg, % Mg, % Mn, ppm Mn, ppm Mo, ppm 

ICP-AES INAA ICP-AES ICP-AES INAA INAA ICP-AES INAA ICP-AES ICP-AES 

1.6 34 43 25 0.5 1.05 1.2 1019 970 <2 1.3 34 45 17 0.6 1.76 2.3 1013 980 <2 1.3 30 34 18 0.3 0.76 1.0 907 920 <2 

0.99 21 28 17 0.3 1.31 1.6 841 820 <2 0.94 22 19 16 0.2 0.90 1.2 1185 1200 <2 0.93 18 18 17 <0.2 1.33 1.6 1112 1100 <2 

1.2 28 26 22 0.3 1.20 1.5 928 880 <2 1.2 20 26 23 0.3 1.37 1.6 1493 1500 <2 1.2 23 22 22 0.2 1.02 1.3 572 550 <2 1.6 36 36 26 <0.2 1.22 1.6 1229 1100 <2 1.4 27 32 18 0.4 1.05 1.2 1034 1000 <2 1.5 20 24 23 0.3 1.42 1.5 1270 1200 <2 1.6 30 48 20 0.4 0.96 1.3 1042 1000 <2 1.1 30 27 17 0.3 1.23 1.5 790 760 <2 1.4 31 28 31 0.4 1.25 1.9 763 760 <2 1.2 28 23 28 0.4 1.39 1.9 791 760 <2 1.9 31 28 30 0.3 1.86 2.5 1047 1100 <2 1.3 26 27 24 0.3 1.37 1.6 852 790 <2 

0.69 <12 28 12 <0.2 0.80 0.74 974 960 2 

1.2 26 26 23 0.3 1.07 1.3 554 520 <2 

0.82 <9 22 17 0.2 0.68 0.83 536 490 <2 

1.3 33 32 27 0.5 1.24 1.6 981 890 <2 1.4 27 26 26 0.4 1.10 1.6 899 900 <2 

0.69 <15 13 9 <0.3 0.58 0.58 354 330 <2 

1.3 24 25 25 0.2 0.89 1.1 508 480 <2 1.1 25 32 17 0.4 1.16 1.3 756 710 <2 1.4 32 38 18 0.4 1.23 1.7 1049 1100 <2 1.4 28 39 19 0.3 1.22 1.7 1256 1200 <2 1.3 28 26 21 0.3 1.20 1.6 815 840 <2 1.2 24 27 20 0.3 1.03 1.3 688 650 <2 1.3 22 26 20 0.4 0.95 1.3 617 600 <2 1.4 31 27 34 0.3 1.45 1.8 772 720 <2 

0.40 <27 10 6 <0.3 0.52 0.47 317 330 <2 

1.1 25 23 18 <0.1 1.13 1.2 642 610 <2 1.1 26 23 19 0.2 1.04 1.3 782 730 <2 1.2 28 23 19 <0.2 0.94 1.2 770 710 <2 

3
438791

438792438793438794438795438796438797438798438799438800438801438802438803438804438806438807438809438810438811438812438813438814438816438817438818438819438820438821438822438823438824438829438831438832438833438872

Sample ID P, % Pb, ppm Pb, ppm Sb, ppm Sb, ppm Sc, ppm Sc, ppm Se, ppm Sn, ppm Sr, ppm 

ICP-AES EDXRF ICP-AES INAA HG-AAS INAA ICP-AES INAA INAA INAA 

0.10 9 12 <1 0.73 12.6 13 <5 <10 332 0.21 6 7 <2 0.76 17.7 17 <5 <10 366 0.08 <5 6 <2 0.96 15.0 14 <5 <10 <249 0.08 18 19 <3 1.0 18.8 20 <5 <10 <342 0.09 14 16 <2 1.2 15.3 15 <5 <10 <222 0.09 17 17 <3 1.5 19.5 20 <5 <10 <307 0.09 <5 7 <2 0.82 17.1 16 <5 <10 <268 0.09 9 13 <3 0.60 18.8 20 <5 <10 <401 0.06 8 9 <1 0.64 14.6 15 <5 <10 <162 0.09 16 19 <4 1.8 17.8 17 <5 <10 <352 0.10 5 15 <2 0.90 14.9 15 <5 <10 <290 0.10 8 12 <3 0.84 17.8 18 <5 <10 <435 0.13 10 10 <2 0.80 16.8 17 <5 <10 <198 0.09 <5 6 <2 0.92 17.6 17 <5 <10 <235 0.09 11 11 <2 0.88 16.5 17 <5 <10 <253 0.13 6 10 <3 0.77 15.6 16 <5 <10 <308 0.09 <5 13 <2 1.6 22.3 25 <5 <10 <217 0.09 5 14 <3 0.80 17.5 18 <5 <10 <245 0.16 <5 7 <4 0.57 10.9 11 <5 <10 <426 0.08 8 9 <4 0.74 15.7 16 <5 <10 <412 0.14 6 7 <2 0.57 12.7 12 <5 <10 <224 0.08 5 12 <3 0.96 17.7 18 <5 <10 <292 0.09 9 11 <2 0.77 16.5 17 <5 <10 <289 0.10 <5 <4 <4 0.61 7.3 7 <5 <10 <462 0.07 7 11 <2 1.1 15.0 15 <5 <10 <180 0.08 10 5 <3 0.86 15.8 16 <5 <10 <251 0.14 5 7 <2 0.96 18.9 19 <5 <10 <272 0.14 7 8 <3 0.96 18.6 19 <5 <10 <400 0.11 6 9 <2 0.82 16.3 19 <5 <10 394 0.08 <5 8 <3 0.76 15.7 16 <5 <10 <245 0.08 8 8 <2 0.89 14.7 16 <5 <10 <257 0.10 15 12 <3 0.88 15.8 16 <5 <10 <327 0.11 <5 4 <5 0.44 5.2 6 <5 <10 <365 0.09 <5 8 <3 0.68 13.7 14 <5 <10 <287 0.11 9 8 <3 0.68 14.9 15 <5 <10 <377 0.14 <5 10 <3 0.68 13.7 14 <5 <10 <337 

4
438791

438792438793438794438795438796438797438798438799438800438801438802438803438804438806438807438809438810438811438812438813438814438816438817438818438819438820438821438822438823438824438829438831438832438833438872

Sample ID U, ppm V, ppm V, ppm Y, ppm Yb, ppm Yb, ppm 

DNC INAA ICP-AES ICP-AES INAA ICP-AES 

4.4 98 100 34 4.7 3 2.3 130 140 34 5.5 3 2.8 128 130 21 3.4 2 1.9 156 160 23 3.4 2 1.8 134 120 16 3.3 2 1.6 157 160 20 <3 2 2.7 127 140 19 3.9 2 2.1 126 150 20 4 2 2.1 126 120 14 3.4 2 3.1 138 140 22 <3.5 2 2.6 135 120 19 3.1 2 2.0 131 130 19 <2.8 2 3.1 152 150 30 4.4 3 2.3 132 150 20 <2.6 2 3.3 136 140 18 3.9 2 2.4 124 130 17 3.6 2 2.7 187 190 19 5.2 2 2.7 133 140 18 <2.2 2 2.3 71 79 20 <3.4 2 2.7 134 130 18 <3.9 2 2.2 74 80 16 <1.8 2 3.4 146 140 20 <3 2 3.2 123 130 18 3.9 2 1.6 64 56 9 <4.4 1 2.5 132 130 16 3 2 2.3 123 130 20 <2.2 2 2.7 151 160 29 4.6 3 2.8 160 150 29 <3.3 3 2.8 140 140 20 3.6 2 2.4 131 130 18 5.8 2 2.3 129 130 17 <2.3 2 3.2 136 130 18 4.3 2 0.9 44 50 8 <5.7 <1 2.1 110 120 15 <2.4 2 1.9 138 130 16 <3.5 2 2.5 112 120 16 <3.8 2 

5
Table 3: Analytical results for the Eagle 3 o Quadrangle, Fortymile Study Area, AK (previous NUR

Al, % Al, % As, ppm As, ppm As, ppm Au, ppm Ba, ppm Ba, ppm 

 INAA ICP-AES EDXRF ICP-AES HG-AAS INAA INAA ICP-AES 

Sample ID Latitude Longitude

438873 64.1247 -142.1294 6.76 6.8 10 <10 5.5 <0.06 903 690 438874 64.1156 -142.0722 6.85 6.6 11 <10 5.8 <0.08 755 720 438875 64.1283 -142.0214 6.48 6.8 11 <10 5.5 <0.04 795 780 438876 64.1253 -141.9789 6.65 6.5 16 <10 14 <0.09 784 780 438877 64.1461 -141.9519 7.06 7.3 17 <10 8.8 <0.06 774 920 438878 64.1367 -141.9175 6.55 6.9 6 <10 6.5 <0.08 682 780 438879 64.1264 -141.8497 7.43 8.2 <5 <10 12 0.14 1026 950 

438880 64.1192 -141.7894 6.95 6.9 10 <10 7.6 <0.09 1153 750 438881 64.1250 -141.7319 2.37 2.5 <5 <10 2.9 <0.09 <281 290 438882 64.1219 -141.6028 3.62 3.6 6 <10 3.2 <0.12 524 490 438883 64.1967 -141.5300 5.45 6.6 13 <10 6.8 1.01 992 990 438884 64.1975 -141.6189 5.97 6.8 6 <10 5.1 <0.07 1122 1000 438885 64.2022 -141.6700 6.40 6.9 <5 <10 5.2 <0.05 1029 920 438886 64.2006 -141.7653 2.37 2.0 <5 <10 2.9 <0.13 <513 330 438887 64.1953 -141.8183 6.34 6.7 9 11 7 <0.03 1319 1200 438888 64.1906 -141.8550 6.40 6.5 9 <10 7.5 <0.06 1129 1100 438889 64.1897 -142.0178 6.96 6.9 <5 <10 6.2 <0.05 1382 1400 438890 64.1964 -142.0561 6.34 6.7 <5 <10 3.5 <0.08 1086 1000 438891 64.1178 -141.5025 6.58 6.6 7 <10 5.0 <0.04 935 850 438892 64.1258 -141.3997 6.86 6.9 9 <10 10 <0.08 1927 1200 438893 64.1117 -141.1992 7.25 7.5 10 14 9.5 <0.06 1173 1100 438894 64.1464 -141.2189 7.51 8.3 19 22 15 <0.07 1185 1300 438895 64.1372 -141.2614 7.65 7.7 10 12 6.6 <0.09 1140 1100 438896 64.1850 -141.2594 6.73 7.0 <5 <10 5.6 <0.06 828 850 438897 64.1844 -141.2069 6.71 6.7 10 10 6.8 <0.08 771 850 438898 64.2044 -141.2064 7.26 7.6 <5 <10 2.2 <0.04 971 770 438899 64.2192 -141.1978 7.14 7.8 5 <10 2.7 <0.08 1117 980 438900 64.2514 -141.2108 6.53 6.7 10 15 10 <0.06 944 1000 438901 64.2608 -141.2042 6.85 7.1 10 12 6.6 <0.07 1268 1300 438902 64.2708 -141.2589 6.34 7.1 11 13 5.5 <0.03 937 970 438903 64.3206 -141.1981 6.44 6.7 12 <10 3.7 <0.07 950 740 438904 64.3325 -141.1894 6.62 7.3 11 11 5.6 <0.06 754 810 438905 64.3464 -141.2508 6.33 7.2 6 12 4.8 <0.07 1021 880 438906 64.3547 -141.2297 6.29 7.1 10 13 4.8 <0.04 844 800 438907 64.3914 -141.2739 5.43 5.8 5 <10 2.2 <0.06 967 930 438908 64.3931 -141.2481 5.28 6.0 6 <10 3.2 <0.05 672 860 

6
Sample ID

438873438874438875438876438877438878438879438880438881438882438883438884438885438886438887438888438889438890438891438892438893438894438895438896438897438898438899438900438901438902438903438904438905438906438907438908

Ce, ppm Co, ppm Co, ppm Cr, ppm Cr, ppm Cs, ppm Cu, ppm Cu, ppm Dy, ppm Eu, ppm 

ICP-AES INAA ICP-AES INAA ICP-AES INAA EDXRF ICP-AES INAA INAA 

53 17 17 61 96 <2.1 31 23 4 1.3 64 13 13 59 71 3.5 31 40 4 1.1 66 8 10 69 84 <1.7 15 13 4 1.1 84 40 22 69 89 <3.2 22 15 4 1.6 96 21 21 63 96 <2.1 26 18 5 1.4 79 17 20 97 130 <2.7 15 17 6 1.7 93 20 24 92 110 3.8 <10 24 6 1.7 49 38 18 102 110 <3.1 48 43 5 1.7 30 15 7 <19 44 <3.2 34 36 4 <0.7 22 8 10 <23 62 <3.8 34 44 <3 <0.8 

130 19 18 145 170 <1.4 25 20 8 1.7 

52 32 19 84 100 <2.6 24 26 4 1.6 69 16 16 60 87 <1.8 17 19 4 1.5 17 12 17 43 50 <3.9 <10 20 <4 <0.9 46 17 22 69 98 <1.4 22 21 4 1.3 

100 28 16 72 77 <2.3 22 21 5 1.5 

70 16 16 61 70 3.8 -- 27 5 1.3 62 23 28 59 93 <3 41 30 5 1.4 57 13 14 80 88 3.5 28 18 5 1.4 69 40 20 52 71 <2.9 21 19 4 1.6 58 19 16 80 100 <2.3 17 16 7 1.6 43 12 15 45 56 <2.5 18 19 4 1.2 47 40 20 63 92 5.8 10 26 5 2.0 49 16 16 74 94 <2 26 19 4 1.4 45 13 16 76 81 <2.9 24 23 4 1.3 56 9 11 65 79 <1.5 <10 10 4 1.3 47 30 10 59 81 <2.8 <10 10 4 1.7 57 22 20 103 120 3.9 23 26 4 1.6 50 14 17 85 98 <2.4 40 31 4 1.1 55 14 17 74 95 <1.2 40 18 4 1.2 50 29 16 97 85 <2.5 26 20 4 1.0 40 19 18 86 92 <2.2 21 17 5 1.1 46 19 20 114 140 <2.4 35 22 5 1.3 

100 15 17 135 130 <1.5 25 13 7 1.8 

38 26 13 45 67 <2.2 36 26 4 1.2 48 15 14 59 77 <1.8 53 28 5 1.4 

7
Sample ID

438873438874438875438876438877438878438879438880438881438882438883438884438885438886438887438888438889438890438891438892438893438894438895438896438897438898438899438900438901438902438903438904438905438906438907438908

K, % La, ppm La, ppm Li, ppm Lu, ppm Mg, % Mg, % Mn, ppm Mn, ppm Mo, ppm 

ICP-AES INAA ICP-AES ICP-AES INAA INAA ICP-AES INAA ICP-AES ICP-AES 

1.3 24 27 19 0.3 1.23 1.7 967 920 <2 1.2 38 37 29 0.3 1.18 1.4 703 650 <2 1.2 29 36 21 0.2 0.98 1.1 600 590 <2 1.2 38 45 23 0.4 0.85 1.1 1098 1000 <2 1.6 32 43 23 0.3 0.91 0.93 1654 1700 <2 1.2 34 42 20 0.4 1.15 1.5 1178 1100 <2 1.6 34 46 23 0.3 1.22 1.4 1882 1800 4 1.2 23 26 21 0.3 1.26 1.5 769 710 <2 

0.39 <10 15 6 <0.2 <0.22 0.41 250 270 <2 0.69 11 13 11 <0.3 0.73 0.59 367 350 2 

1.4 74 74 21 0.8 0.85 1.5 1496 1600 <2 1.2 34 27 23 0.5 1.16 1.4 1288 1300 <2 1.5 29 36 23 0.4 1.11 1.4 930 910 <2 

0.39 <10 9 5 <0.3 <0.37 0.51 1342 1200 5 

1.3 25 24 27 0.4 1.38 1.6 862 810 <2 1.8 42 54 26 0.3 1.09 1.2 908 870 <2 2.0 29 36 42 0.3 0.98 1.2 822 800 <2 1.2 19 32 22 0.3 1.54 2.0 1682 1700 <2 1.1 28 31 19 0.3 0.90 1.3 884 830 <2 1.4 35 36 21 0.4 1.01 1.1 1598 1500 <2 1.2 32 30 21 0.4 0.92 1.3 956 940 <2 1.9 22 23 19 0.3 1.31 1.5 1040 1000 <2 1.2 31 24 25 <0.2 1.25 1.5 1077 1000 <2 1.3 27 27 22 0.3 1.15 1.4 611 620 <2 1.2 27 24 26 0.3 1.18 1.4 810 770 <2 1.2 33 31 17 0.3 0.87 1.1 607 580 <2 1.6 29 27 18 0.3 1.09 0.91 451 420 <2 1.3 29 29 31 0.4 1.08 1.5 1199 1200 <2 1.5 26 26 32 0.3 1.20 1.6 906 880 <2 1.5 29 28 23 0.3 1.02 1.5 879 930 <2 1.1 25 26 21 0.4 1.16 1.3 737 700 <2 1.1 21 21 20 0.3 1.19 1.4 754 770 <2 1.0 25 23 21 0.4 1.47 1.9 1049 1100 <2 1.1 53 53 18 0.7 0.95 1.5 1039 1100 <2 

0.89 18 20 20 0.2 0.90 1.1 826 840 <2 0.93 24 25 19 0.4 0.94 1.3 1009 1100 <2 

8
Sample ID

438873438874438875438876438877438878438879438880438881438882438883438884438885438886438887438888438889438890438891438892438893438894438895438896438897438898438899438900438901438902438903438904438905438906438907438908

P, % Pb, ppm Pb, ppm Sb, ppm Sb, ppm Sc, ppm Sc, ppm Se, ppm Sn, ppm Sr, ppm 

ICP-AES EDXRF ICP-AES INAA HG-AAS INAA ICP-AES INAA INAA INAA 

0.12 <5 9 <2 0.74 16.9 17 <5 <10 <285 0.10 <5 9 <2 0.88 14.2 15 <5 <10 <348 0.11 6 8 <1 1.0 15.0 16 <5 <10 <202 0.13 <5 12 <3 0.86 14.3 15 <5 <10 <325 0.12 <5 13 <2 1.0 12.5 13 <5 <10 <383 0.12 5 7 <2 0.80 17.9 18 <5 <10 <404 0.16 <5 11 <1 1.1 17.2 18 <5 <10 <285 0.09 <5 8 <3 1.1 17.6 17 <5 <10 <289 0.09 <5 <4 <3 0.47 6.6 7 <5 <10 <299 0.09 <5 5 <3 0.64 8.1 8 <5 <10 <443 0.14 <5 18 <1 0.93 19.2 20 <5 <10 <208 0.11 <5 8 <2 0.74 16.6 16 <5 <10 <300 0.10 7 13 <2 0.81 16.0 16 <5 <10 <251 0.08 <5 <4 <3 0.34 5.1 5 <5 <10 <713 0.11 8 10 <1 0.82 19.0 19 <5 <10 <171 0.10 6 11 <2 0.86 13.4 13 <5 <10 <249 0.10 0 14 <2 0.57 15.5 15 <5 <10 <234 0.14 8 10 <3 0.45 19.2 20 <5 <10 <485 0.13 10 10 <1 1.4 17.1 17 <5 <10 <199 0.12 7 14 <2 1.1 14.7 15 <5 <10 <352 0.11 <5 9 <2 1.9 20.9 21 <5 <10 <277 0.11 6 14 3 2.2 19.6 21 <5 <10 <368 0.10 7 9 3 2.6 18.1 19 <5 <10 <310 0.07 11 8 <2 0.85 15.4 16 <5 <10 <237 0.09 <5 9 <2 1.3 17.1 17 <5 <10 <375 0.05 7 10 <1 0.35 17.0 17 <5 <10 <177 0.06 8 12 <2 0.37 12.8 13 <5 <10 <248 0.10 6 11 <2 1.6 15.4 16 <5 <10 <302 0.09 7 12 <2 1.1 15.8 16 <5 <10 <332 0.10 9 11 <1 0.85 15.4 16 <5 <10 <164 0.07 <5 6 <2 0.67 19.0 19 <5 <10 <234 0.07 <5 9 <2 0.64 21.2 22 <5 <10 <247 0.08 8 9 <2 0.89 19.6 21 <5 <10 <333 0.09 6 8 <1 0.70 21.7 23 <5 <10 <190 0.10 5 9 <2 0.34 14.3 15 <5 <10 <227 0.10 <5 9 <2 0.64 16.3 17 <5 <10 <246 

9
Sample ID

438873438874438875438876438877438878438879438880438881438882438883438884438885438886438887438888438889438890438891438892438893438894438895438896438897438898438899438900438901438902438903438904438905438906438907438908

U, ppm V, ppm V, ppm Y, ppm Yb, ppm Yb, ppm 

DNC INAA ICP-AES ICP-AES INAA ICP-AES 

3.0 137 140 21 4 2 3.5 116 120 18 3.4 2 2.9 137 130 18 3.5 2 3.7 122 130 22 <2.9 2 3.9 118 110 28 4.2 3 2.9 169 160 25 4.6 2 3.9 122 140 33 3.9 3 2.0 129 130 19 <2.9 2 1.2 58 64 13 <3.1 1 1.3 59 63 11 <3.9 1 6.3 244 270 35 8.4 4 2.3 131 140 22 <2.2 3 2.9 127 130 21 3.8 2 0.9 66 45 6 <4.2 <1 2.1 147 150 21 3.8 2 3.2 105 110 22 7.1 2 3.5 120 120 24 4.1 2 2.0 183 180 23 <2.5 2 2.9 128 130 21 5.6 2 5.9 118 120 25 <2.4 3 2.8 151 160 23 4.8 3 2.0 160 140 19 6.2 2 2.2 159 150 19 <2.8 2 2.6 124 130 17 <1.8 2 2.3 127 140 18 3.7 2 2.6 99 110 20 3.1 2 2.7 103 92 16 <2.6 2 2.6 124 130 21 3.1 2 2.3 128 130 19 <2.2 2 2.5 119 130 19 3.6 2 2.4 124 130 17 <3 2 2.2 146 150 16 2.8 2 2.2 158 160 21 3.2 2 5.1 150 160 29 6.1 3 1.7 108 110 18 <2 2 2.3 125 130 20 4.6 2 

10
Table 3: Analytical results for the Eagle 3 o Quadrangle, Fortymile Study Area, AK (previous NUR

Al, % Al, % As, ppm As, ppm As, ppm Au, ppm Ba, ppm Ba, ppm 

 INAA ICP-AES EDXRF ICP-AES HG-AAS INAA INAA ICP-AES 

Sample ID Latitude Longitude

438909 64.4189 -141.3461 5.51 5.9 9 <10 2.5 <0.06 1253 1300 438910 64.3772 -141.3692 4.69 5.0 19 13 12 <0.04 1197 1300 438911 64.3564 -141.3103 6.45 6.7 <5 <10 3.2 <0.07 1298 1100 438912 64.3483 -141.3731 5.48 5.6 11 <10 4.5 <0.05 999 920 438913 64.3267 -141.2978 6.75 7.0 9 11 4.6 <0.08 1155 1300 438914 64.3239 -141.3228 5.44 6.4 6 11 5.4 <0.04 945 890 438915 64.2861 -141.3439 6.06 6.5 7 11 6.5 <0.06 1381 1100 438916 64.2747 -141.3175 6.87 7.3 9 <10 3.5 <0.05 1089 1100 438917 64.1875 -141.3547 8.23 7.9 16 <10 7.9 <0.08 985 990 438918 64.1800 -141.3219 6.83 7.6 33 21 20 <0.04 1099 1000 438919 64.1675 -141.3056 7.01 7.1 7 15 7.8 <0.07 1025 870 438920 64.1453 -141.3081 6.55 7.2 10 11 6.0 <0.05 1040 1000 438921 64.1133 -141.2869 6.41 6.8 6 <10 7.1 <0.10 1368 1300 438922 64.1061 -141.2753 6.86 7.3 10 <10 5.3 <0.04 1179 1000 438923 64.0997 -141.3394 6.85 7.7 13 14 5.5 <0.06 1108 910 438924 64.0856 -141.3733 6.68 6.8 16 12 12 <0.06 955 1000 438925 64.0708 -141.3942 6.72 6.3 12 <10 5.0 <0.07 937 830 438926 64.0858 -141.2706 6.60 7.4 15 13 7.0 <0.03 1044 950 438927 64.3572 -141.4067 4.84 5.2 9 <10 4.9 <0.06 871 880 438928 64.3736 -141.4122 4.76 5.1 7 <10 4.4 <0.05 1133 1200 438929 64.3997 -141.3903 5.41 5.3 15 12 13 <0.07 1037 1100 438931 64.4197 -141.3772 4.94 7.8 <5 <10 1.9 <0.03 1170 1900 438932 64.4436 -141.3111 3.39 2.8 31 24 26 <0.2 816 660 438933 64.4414 -141.1964 4.94 5.7 <5 <10 3.0 <0.05 1049 1100 438934 64.4508 -141.0836 6.40 6.7 9 <10 7.7 <0.08 1411 1400 438935 64.4431 -141.0911 6.00 6.3 11 <10 8.8 <0.03 1660 1500 438936 64.4578 -141.0717 6.12 5.8 14 <10 10 <0.07 1340 1200 438966 64.4964 -141.5456 5.78 6.5 31 24 23 <0.05 911 1000 438991 64.0022 -141.5917 6.10 6.3 17 10 8.5 <0.03 1141 1000 438992 64.0228 -141.5722 7.02 6.7 <5 <10 2.3 <0.08 1019 950 438993 64.0161 -141.7189 3.62 3.5 <5 <10 3.2 <0.09 626 430 438994 64.0050 -141.7528 8.33 8.2 9 <10 3.5 <0.07 876 920 438995 64.0081 -141.7881 7.13 6.8 7 <10 4.2 <0.08 1052 870 438996 64.0264 -141.8556 6.92 7.1 8 <10 3.7 0.14 851 820 438997 64.0064 -141.8825 6.27 6.2 27 12 19 <0.08 530 790 438998 64.0289 -141.9594 6.65 6.8 13 <10 4.9 <0.04 1000 770 

11
Sample ID

438909438910438911438912438913438914438915438916438917438918438919438920438921438922438923438924438925438926438927438928438929438931438932438933438934438935438936438966438991438992438993438994438995438996438997438998

Ce, ppm Co, ppm Co, ppm Cr, ppm Cr, ppm Cs, ppm Cu, ppm Cu, ppm Dy, ppm Eu, ppm 

ICP-AES INAA ICP-AES INAA ICP-AES INAA EDXRF ICP-AES INAA INAA 

38 12 16 56 61 <2.1 52 34 3 0.9 41 30 33 69 96 <1.7 43 35 4 1.4 40 32 19 74 110 <2.7 47 40 4 1.4 47 27 29 219 260 <1.9 57 36 5 1.2 50 22 24 179 220 6.0 62 44 4 1.4 49 24 27 97 120 1.7 51 58 3 1.2 51 32 19 121 120 <2.3 40 24 4 1.2 50 19 17 88 100 <1.8 34 16 3 1.2 79 13 15 69 91 <2.8 37 24 6 1.9 59 19 21 50 64 3.9 34 21 4 1.2 52 30 15 77 96 <2.6 35 27 4 1.4 51 15 15 82 93 4.5 39 21 5 1.4 58 17 21 52 71 <3.4 30 26 8 1.6 48 10 14 66 76 <1.6 33 24 5 1.3 52 25 15 74 87 <2.2 25 16 5 1.6 55 20 19 84 100 4.8 33 19 4 1.4 53 12 13 74 81 <2.3 20 15 5 1.5 54 15 19 91 110 <1.4 30 25 4 1.3 48 26 13 86 88 <2.1 38 21 5 1.4 51 15 14 115 140 <1.7 59 38 3 1.1 58 21 26 96 110 <2.5 46 33 5 1.3 49 20 20 83 66 <1.4 113 97 5 1.4 28 87 12 <38 81 <6.3 48 47 <3 <1.2 44 17 17 121 140 <1.8 40 33 4 0.8 78 18 20 108 110 <2.5 34 26 5 1.6 74 19 21 100 120 <1.4 36 28 5 1.0 68 29 16 97 99 7.3 36 27 4 1.6 95 25 34 77 94 6.2 29 26 5 1.7 47 16 17 127 140 3.3 32 23 4 1.2 43 29 9 74 87 <2.7 21 17 3 1.5 25 20 13 52 57 <2.9 24 20 <3 <0.6 43 14 16 63 70 3.6 36 34 4 1.1 49 41 16 69 85 <2.9 34 29 4 1.6 70 16 15 92 96 <1.8 28 17 5 1.4 58 20 23 68 97 <2.9 35 25 4 1.2 42 12 12 85 88 <1.4 30 27 4 1.1 

12
Sample ID

438909438910438911438912438913438914438915438916438917438918438919438920438921438922438923438924438925438926438927438928438929438931438932438933438934438935438936438966438991438992438993438994438995438996438997438998

K, % La, ppm La, ppm Li, ppm Lu, ppm Mg, % Mg, % Mn, ppm Mn, ppm Mo, ppm 

ICP-AES INAA ICP-AES ICP-AES INAA INAA ICP-AES INAA ICP-AES ICP-AES 

0.97 21 18 25 0.4 0.74 1.1 1214 1200 <2 0.88 24 23 27 0.2 0.81 0.99 3784 3500 <2 0.99 21 21 25 0.2 1.60 2.0 903 920 <2 0.92 22 27 21 0.2 2.10 2.7 1085 1100 <2 

1.3 28 26 30 0.3 1.67 2.2 723 700 <2 1.0 25 24 25 0.3 1.39 2.0 2370 2500 <2 1.2 27 26 27 <0.1 1.51 1.8 901 890 <2 1.3 25 26 20 0.3 1.10 1.3 821 830 <2 2.1 51 50 18 0.2 0.94 1.1 966 870 <2 1.6 27 31 32 0.3 1.04 1.3 1788 1900 <2 1.3 29 26 26 0.3 1.21 1.3 637 590 <2 1.2 27 27 23 0.4 1.13 1.5 711 700 <2 1.2 29 31 22 0.2 1.28 1.5 1318 1300 <2 1.2 25 25 20 0.4 0.92 1.2 643 610 <2 1.2 27 27 18 0.4 1.28 1.4 857 870 <2 1.3 28 29 22 0.4 1.08 1.3 794 750 <2 1.2 29 29 18 0.3 1.08 1.1 752 690 <2 1.3 26 27 21 0.4 1.16 1.5 867 900 <2 

0.88 29 26 13 0.4 0.79 1.0 911 880 <2 

1.3 25 29 24 0.2 1.06 1.3 645 640 <2 1.2 29 31 23 0.3 0.93 1.1 1810 1800 2 1.7 26 27 30 0.3 0.87 1.6 1742 1000 <2 

0.72 <25 15 11 <0.4 0.58 0.52 647 560 5 

1.0 22 23 23 0.3 1.03 1.3 1924 1900 <2 1.7 41 40 23 0.3 0.93 1.1 1229 1200 <2 1.7 36 39 21 0.4 1.09 1.2 1111 1100 <2 1.6 38 35 24 0.4 0.96 0.83 736 660 <2 1.8 44 52 26 0.4 0.72 0.80 4545 5100 <2 1.2 23 26 22 0.3 1.02 1.5 873 840 <2 1.5 23 23 19 <0.1 1.22 1.1 540 490 <2 

0.58 <8 13 12 <0.2 0.68 0.77 623 560 <2 

1.3 21 23 26 0.3 1.01 1.2 789 760 <2 1.3 30 26 22 0.3 0.84 1.0 798 730 <2 1.2 28 38 18 0.4 1.19 1.5 699 680 <2 1.2 23 32 20 0.2 0.94 1.2 1163 1100 <2 1.3 24 23 21 0.3 1.13 1.1 612 570 <2 

13
Sample ID

438909438910438911438912438913438914438915438916438917438918438919438920438921438922438923438924438925438926438927438928438929438931438932438933438934438935438936438966438991438992438993438994438995438996438997438998

P, % Pb, ppm Pb, ppm Sb, ppm Sb, ppm Sc, ppm Sc, ppm Se, ppm Sn, ppm Sr, ppm 

ICP-AES EDXRF ICP-AES INAA HG-AAS INAA ICP-AES INAA INAA INAA 

0.07 <5 7 <2 0.44 14.4 14 <5 <10 <351 0.13 <5 18 <1 0.78 12.4 12 <5 <10 <435 0.08 10 8 <2 0.41 18.5 19 <5 <10 <262 0.08 <5 10 <2 0.72 17.6 16 <5 <10 <262 0.09 <5 8 <2 1.2 16.3 17 <5 <10 <337 0.07 9 13 <1 0.51 18.5 19 <5 <10 <291 0.08 10 11 <2 0.85 15.5 15 <5 <10 <244 0.06 <5 9 <1 0.57 15.7 16 <5 <10 <242 0.10 12 19 <2 0.98 13.7 14 <5 <10 <402 0.10 <5 11 5 3.2 15.9 16 <5 <10 <258 0.07 14 13 <2 2.5 16.2 15 <5 <10 <243 0.15 5 7 7 5.2 15.1 15 <5 <10 <219 0.12 <5 15 <3 0.82 19.5 20 <5 <10 <470 0.08 6 11 <1 0.75 17.0 17 <5 <10 <187 0.17 5 9 <2 1.2 18.0 19 <5 <10 <236 0.10 7 15 <2 0.84 16.0 16 <5 <10 <274 0.07 <5 11 <2 0.75 14.8 14 <5 <10 <327 0.10 7 9 <1 0.93 18.4 19 <5 <10 <185 0.07 <5 13 <2 1.0 16.3 16 <5 <10 <225 0.06 10 16 <1 0.86 12.6 13 <5 <10 <209 0.07 10 15 <2 0.84 13.3 13 <5 <10 <479 0.11 <5 9 <1 0.86 12.9 21 <5 <10 <262 0.13 <5 10 <6 0.88 7.9 7 <5 <10 <496 0.09 12 11 <2 0.56 14.6 15 <5 <10 <344 0.10 12 17 3 1.9 15.5 17 <5 <10 <404 0.10 11 17 <1 2.1 15.7 16 <5 <10 <191 0.08 13 21 <2 2.8 13.9 14 <5 <10 <231 0.12 24 51 <1 1.7 12.6 12 <5 <10 <486 0.10 <5 13 <1 0.77 17.0 17 <5 <10 <175 0.06 6 7 <2 0.54 12.4 12 <5 <10 <270 0.10 <5 6 <3 0.47 11.0 10 <5 <10 <358 0.06 <5 8 <2 0.75 14.5 14 <5 <10 <350 0.07 9 11 <3 0.68 14.3 14 <5 <10 <309 0.10 <5 8 <2 0.54 16.5 17 <5 <10 <243 0.15 <5 13 <3 0.80 13.5 14 <5 <10 <447 0.07 <5 6 <1 0.84 14.4 14 <5 <10 <184 

14
Sample ID

438909438910438911438912438913438914438915438916438917438918438919438920438921438922438923438924438925438926438927438928438929438931438932438933438934438935438936438966438991438992438993438994438995438996438997438998

U, ppm V, ppm V, ppm Y, ppm Yb, ppm Yb, ppm 

DNC INAA ICP-AES ICP-AES INAA ICP-AES 

1.8 102 110 18 2.7 2 2.2 124 120 15 3.5 2 1.9 151 160 21 3.3 2 1.9 135 140 20 2.5 2 2.2 151 160 18 3.3 2 2.4 177 190 20 3.8 2 2.4 129 130 19 3.6 2 2.4 114 120 17 3 2 3.4 96 95 20 3.9 2 2.7 102 120 19 3.5 2 2.4 125 120 18 <2.4 2 2.3 132 130 20 3.6 2 2.3 154 160 26 5.4 3 2.3 135 140 19 4.7 2 2.6 131 140 22 5 2 2.6 145 140 19 3.3 2 2.5 130 120 18 3 2 2.4 143 150 20 3.6 2 2.5 125 120 19 3.7 2 2.1 106 100 17 3.3 2 2.8 114 120 21 3.8 2 2.8 114 150 25 4.2 2 2.8 70 61 12 <6.7 1 2.0 108 120 22 4.3 3 3.9 139 130 17 5.2 2 3.7 132 140 16 4.1 2 3.3 132 120 14 3.8 2 4.8 105 100 23 5.1 2 2.6 132 130 19 4.3 2 2.3 96 92 13 <2.5 1 1.5 86 76 10 <2.8 1 2.3 135 120 15 3.7 2 2.5 130 120 15 <2.7 2 2.8 127 130 22 4.3 2 2.1 135 130 18 4 2 2.2 115 110 15 3.2 2 

15
Table 3: Analytical results for the Eagle 3 o Quadrangle, Fortymile Study Area, AK (previous NUR

Al, % Al, % As, ppm As, ppm As, ppm Au, ppm Ba, ppm Ba, ppm 

 INAA ICP-AES EDXRF ICP-AES HG-AAS INAA INAA ICP-AES 

Sample ID Latitude Longitude

438999 64.0131 -142.0556 7.19 7.3 12 <10 5.6 <0.06 902 780 439000 64.0136 -142.1194 3.47 3.4 5 <10 3.0 <0.08 <313 500 439001 64.0064 -142.1839 7.00 6.9 8 <10 4.7 <0.07 744 700 439049 64.0125 -141.5258 6.71 6.7 9 <10 5.1 <0.04 945 850 439050 64.0153 -141.4925 6.69 6.5 12 <10 9.6 <0.16 960 840 439051 64.0067 -141.4625 7.13 6.8 22 15 16 <0.10 743 760 439052 64.0094 -141.4408 7.05 6.7 14 <10 5.6 <0.13 741 790 439053 64.0153 -141.3667 6.64 6.5 8 <10 9.5 <0.09 1147 890 439054 64.0175 -141.3067 7.17 7.6 <5 <10 3.8 <0.12 1046 1100 439055 64.0142 -141.2153 6.50 7.3 5 <10 4.6 <0.10 1127 1100 439056 64.0156 -141.1925 <1.38 1.3 42 <10 16 <0.26 <2364 2000 439057 64.0125 -141.1253 6.29 6.5 10 11 7.9 <0.07 1443 1200 439058 64.0136 -141.0944 6.25 6.2 20 17 17 <0.14 1584 1400 439059 64.0261 -141.0375 2.35 2.1 66 56 64 <0.21 <308 550 439060 64.0419 -141.0081 5.88 5.8 42 41 40 <0.13 1382 1300 439061 64.0572 -141.0139 5.84 6.5 46 50 48 <0.06 2091 2100 439062 64.0639 -141.0361 5.12 5.4 21 17 15 <0.10 1686 1500 439063 64.1194 -141.0144 6.70 6.2 7 <10 6.1 <0.09 1332 1500 439064 64.1267 -141.0172 7.66 7.6 <5 <10 1.9 <0.10 2325 2300 439065 64.1450 -141.0222 6.49 7.1 14 11 12 <0.06 910 910 439066 64.1847 -141.0417 6.68 6.6 <5 <10 5.0 <0.15 884 830 439067 64.2028 -141.0394 6.67 7.0 <5 <10 4.2 <0.09 594 790 439068 64.2639 -141.0586 6.38 6.7 8 10 6.2 <0.13 692 880 439069 64.2842 -141.0150 5.77 5.7 8 <10 4.7 <0.05 1397 1200 439070 64.3069 -141.0367 5.65 6.1 <5 14 6.2 <0.11 1096 1000 439071 64.3619 -141.0553 6.37 6.4 7 <10 4.9 <0.10 1010 990 439072 64.3908 -141.0483 6.00 5.7 11 12 12 <0.13 1236 1100 439073 64.3989 -141.0339 6.16 6.1 10 <10 7.1 <0.06 1270 1200 439074 64.4033 -141.0881 5.76 5.7 9 <10 7.1 <0.13 1318 1200 439075 64.3914 -141.1153 5.48 5.4 7 10 3.1 <0.09 1114 1100 439076 64.3786 -141.1531 6.76 6.4 <5 <10 3.0 <0.11 849 880 439077 64.3825 -141.1297 5.80 6.6 5 <10 3.1 <0.05 830 900 439078 64.3492 -141.1708 5.84 6.2 25 29 25 <0.15 837 820 439079 64.3267 -141.1361 5.62 6.3 <5 13 1.6 <0.12 840 890 439080 64.3128 -141.0958 7.20 7.7 8 12 3.2 <0.13 557 640 439081 64.2614 -141.1067 6.35 6.9 7 <10 4.9 <0.06 814 820 

16
Sample ID

438999439000439001439049439050439051439052439053439054439055439056439057439058439059439060439061439062439063439064439065439066439067439068439069439070439071439072439073439074439075439076439077439078439079439080439081

Ce, ppm Co, ppm Co, ppm Cr, ppm Cr, ppm Cs, ppm Cu, ppm Cu, ppm Dy, ppm Eu, ppm 

ICP-AES INAA ICP-AES INAA ICP-AES INAA EDXRF ICP-AES INAA INAA 

83 31 18 79 91 <2.3 21 15 5 1.3 28 17 11 38 55 <2.8 47 46 <3 <0.6 75 13 14 131 110 <2.4 16 22 7 1.7 43 10 11 83 91 <1.6 17 18 4 1.1 51 37 13 92 85 <3.3 20 18 4 1.7 56 20 21 110 120 <2.2 22 23 5 1.3 55 16 17 89 99 <2.8 30 19 5 1.4 58 14 19 72 92 3.5 29 28 4 1.3 50 30 15 101 110 <2.7 19 18 4 1.6 50 15 16 71 94 <2.2 40 30 5 1.8 45 84 90 <31 19 <5.2 <10 29 <3 2.7 57 16 20 93 100 3.0 40 37 5 1.3 58 37 21 204 230 7.1 40 37 5 1.6 65 22 15 <27 54 <4.4 11 27 5 2.0 67 17 19 81 110 5.7 27 33 5 2.1 56 23 29 161 220 4.1 29 43 5 1.4 61 28 19 85 120 <2.1 50 51 4 1.7 76 21 17 143 160 2.3 26 24 6 2.0 83 6 7 40 57 4.2 <10 11 4 1.8 68 13 16 113 140 <1.5 18 18 5 1.4 72 38 19 84 94 <3.2 22 20 6 1.6 72 17 16 74 88 <1.9 25 21 5 1.3 58 18 22 76 100 4.2 28 22 4 1.4 64 11 13 84 99 <1.2 16 21 4 1.4 76 27 18 100 120 4.0 20 30 5 1.8 50 17 17 95 100 <2.2 23 25 6 1.2 52 11 12 75 96 <2.7 15 18 4 1.1 62 12 16 92 120 <1.5 20 19 5 1.1 55 30 13 122 120 <2.8 14 22 5 1.6 49 20 19 98 110 <2 18 16 4 1.2 40 12 14 73 83 <2.5 18 18 4 1.3 53 10 13 82 90 <1.3 20 10 5 1.3 43 31 14 93 91 <3.3 <10 10 4 1.6 32 29 33 210 290 <2.7 39 37 3 1.1 38 19 22 78 110 <2.7 14 15 4 1.3 52 18 20 69 89 <1.5 78 74 4 1.4 

17
Sample ID

438999439000439001439049439050439051439052439053439054439055439056439057439058439059439060439061439062439063439064439065439066439067439068439069439070439071439072439073439074439075439076439077439078439079439080439081

K, % La, ppm La, ppm Li, ppm Lu, ppm Mg, % Mg, % Mn, ppm Mn, ppm Mo, ppm 

ICP-AES INAA ICP-AES ICP-AES INAA INAA ICP-AES INAA ICP-AES ICP-AES 

1.5 42 44 23 0.4 1.07 1.3 1136 1100 <2 

0.61 <9 16 9 <0.2 0.69 0.61 555 520 <2 

1.1 40 39 18 0.6 1.40 1.5 813 760 <2 1.3 24 24 23 0.2 1.00 1.1 564 520 <2 1.2 <25 29 21 <0.2 0.98 1.3 754 720 <2 1.2 24 31 21 <0.1 1.40 1.7 957 910 <2 1.2 32 30 20 0.3 1.31 1.4 1102 1000 <2 1.2 31 29 24 <0.1 0.58 0.84 645 600 <2 1.6 34 27 25 <0.2 1.06 1.2 802 790 <2 1.3 <13 26 23 0.3 0.92 1.3 727 770 <2 

0.25 <25 35 4 <0.4 <1.87 0.25 18060 16000 <2 

1.4 25 29 26 0.3 1.21 1.3 1726 1700 <2 1.5 <23 32 39 <0.2 1.55 1.7 773 720 <2 

0.26 <34 32 4 <0.3 <0.22 0.31 501 510 <2 

1.4 38 34 34 0.5 0.70 0.88 825 790 2 1.3 28 29 33 0.3 1.47 2.1 1715 1900 <2 1.4 35 32 23 0.3 0.72 1.0 1255 1300 <2 1.5 39 42 22 0.4 1.32 1.6 939 870 <2 2.8 63 51 28 0.4 0.66 0.89 553 530 <2 1.6 29 35 21 0.5 1.27 1.7 1153 1200 <2 1.3 34 36 27 0.4 1.28 1.3 1324 1200 <2 1.4 42 42 24 0.3 1.10 1.2 930 940 <2 1.3 34 31 27 0.4 1.13 1.3 1702 1800 <2 1.5 33 34 20 0.3 1.03 1.2 670 660 <2 1.3 40 40 24 0.4 1.36 1.6 1248 1300 <2 1.2 29 27 24 0.2 1.08 1.4 572 570 <2 1.2 35 27 23 <0.2 0.88 0.97 423 410 <2 1.6 35 32 25 0.3 1.08 1.4 693 690 <2 1.3 32 29 25 <0.2 0.93 1.0 399 380 <2 

0.96 21 26 23 0.2 1.12 1.3 834 820 <2 

1.1 23 20 17 0.3 1.09 1.4 633 580 <2 1.2 25 28 16 0.3 0.90 1.2 694 680 <2 

0.97 <27 22 16 <0.2 0.95 1.2 518 540 <2 

1.2 17 17 18 0.3 2.97 4.6 727 750 <2 

0.77 22 19 16 0.2 1.45 2.1 1120 1100 <2 

1.3 27 27 16 0.3 1.27 1.7 797 820 <2 

18
Sample ID

438999439000439001439049439050439051439052439053439054439055439056439057439058439059439060439061439062439063439064439065439066439067439068439069439070439071439072439073439074439075439076439077439078439079439080439081

P, % Pb, ppm Pb, ppm Sb, ppm Sb, ppm Sc, ppm Sc, ppm Se, ppm Sn, ppm Sr, ppm 

ICP-AES EDXRF ICP-AES INAA HG-AAS INAA ICP-AES INAA INAA INAA 

0.12 6 10 <2 0.67 15.4 15 <5 <10 <281 0.15 <5 8 <2 0.58 7.0 7 <5 <10 <367 0.11 <5 6 <2 0.81 17.6 18 <5 <10 365 0.08 <5 11 <1 0.83 14.4 14 <5 <10 <194 0.08 <5 12 <5 0.86 15.8 16 <5 <10 <266 0.08 <5 16 <3 0.83 20.6 20 <5 <10 <257 0.09 <5 12 <4 0.68 18.7 19 <5 <10 <377 0.13 9 19 <3 0.59 12.7 13 <5 <10 <216 0.08 6 11 <4 0.49 15.6 15 <5 <10 <241 0.09 6 11 <3 0.52 15.9 18 <5 <10 <251 0.11 <5 34 <7 0.29 3.4 3 <5 <10 -- 0.10 6 17 <2 0.64 17.5 18 <5 <10 <275 0.11 9 20 <4 1.5 15.1 14 <5 <10 <247 0.14 <5 27 <6 0.27 5.5 5 <5 <10 <361 0.11 15 21 <4 0.83 12.3 13 <5 <10 <337 0.16 14 17 <2 0.82 17.5 20 <5 <10 <235 0.11 5 14 <3 0.55 14.3 14 <5 <10 <244 0.10 18 20 <3 0.40 12.7 13 <5 <10 <268 0.10 17 24 <3 0.27 7.6 8 <5 <10 <292 0.08 17 24 <2 0.67 23.2 27 <5 <10 <193 0.08 8 12 <4 0.72 16.1 17 <5 <10 <332 0.08 8 14 <3 0.64 15.7 17 <5 <10 <261 0.10 <5 14 <4 0.96 15.1 17 <5 <10 <479 0.08 10 14 <2 0.85 11.9 13 <5 <10 <159 0.12 10 13 <3 0.96 17.2 18 <5 <10 <262 0.06 6 10 <3 0.88 16.5 18 <5 <10 <245 0.09 9 14 <4 0.98 12.0 13 <5 <10 <294 0.08 7 15 <2 0.90 15.8 16 <5 <10 <172 0.07 6 15 <4 1.1 12.9 13 <5 <10 <204 0.08 <5 7 <3 0.90 13.9 15 <5 <10 <261 0.06 5 9 <3 0.53 18.7 20 <5 <10 <297 0.07 <5 10 <2 0.59 17.7 20 <5 <10 454 0.13 <5 14 <5 0.51 14.1 16 <5 <10 <260 0.06 <5 10 <4 0.40 33.9 38 <5 <10 <249 0.10 <5 7 <4 0.31 22.9 25 <5 <10 <377 0.10 8 14 <2 0.69 22.0 24 <5 <10 365 

19
Sample ID

438999439000439001439049439050439051439052439053439054439055439056439057439058439059439060439061439062439063439064439065439066439067439068439069439070439071439072439073439074439075439076439077439078439079439080439081

U, ppm V, ppm V, ppm Y, ppm Yb, ppm Yb, ppm 

DNC INAA ICP-AES ICP-AES INAA ICP-AES 

4.0 134 130 23 5.8 2 1.4 85 75 12 <2.7 1 3.7 163 150 22 4.6 2 2.2 108 110 15 2.6 2 2.3 143 120 17 <4.5 2 2.3 160 150 21 <2.7 2 2.6 152 140 21 4.9 2 2.5 132 140 16 <2.2 2 2.3 113 120 15 <3.3 2 2.5 143 140 20 <2.7 2 1.3 <107 45 28 <7.2 2 3.3 131 120 20 4.2 2 4.2 138 140 18 <3.9 2 1.9 96 100 25 <6 2 4.6 127 130 20 5.6 2 3.7 151 160 18 3.6 2 3.4 125 130 15 3.4 1 5.1 92 89 19 4.1 2 7.7 48 54 22 <3.3 2 5.3 120 120 24 4.9 3 5.4 112 120 23 <4.1 2 5.5 117 110 24 4.4 2 3.1 121 120 22 <3.5 2 4.9 77 83 19 3.6 2 2.9 151 150 25 5.8 3 2.7 126 130 18 3.8 2 2.5 131 120 15 <3.5 2 2.5 124 130 15 4.4 2 2.7 129 130 15 <3.5 2 2.4 134 140 17 <2.5 2 2.2 120 120 17 4.5 2 2.9 122 120 20 4.8 2 2.0 157 150 15 <4.2 1 1.5 180 190 12 <3.2 1 1.5 146 160 20 4.9 2 2.7 173 180 19 3.5 2 

20
Table 3: Analytical results for the Eagle 3 o Quadrangle, Fortymile Study Area, AK (previous NUR

Al, % Al, % As, ppm As, ppm As, ppm Au, ppm Ba, ppm Ba, ppm 

 INAA ICP-AES EDXRF ICP-AES HG-AAS INAA INAA ICP-AES 

Sample ID Latitude Longitude

439082 64.2617 -141.1542 6.06 6.2 12 15 8.2 <0.12 1002 990 439083 64.2314 -141.1497 6.99 6.6 <5 <10 3.6 <0.09 838 810 439084 64.2069 -141.1242 6.46 6.4 <5 <10 2.9 <0.17 919 790 439085 64.1817 -141.1447 6.05 6.4 9 11 4.9 <0.05 774 780 439086 64.1822 -141.1131 6.36 6.5 6 <10 5.6 <0.12 1124 1000 439087 64.1542 -141.1086 6.83 7.0 11 <10 6.5 <0.10 1043 1100 439088 64.1317 -141.1172 7.33 7.1 18 21 15 <0.13 697 710 439089 64.1103 -141.0964 5.93 6.5 20 20 21 <0.05 1395 1200 439090 64.0972 -141.1078 6.58 6.7 20 20 21 <0.12 1894 1700 439091 64.2539 -141.4258 5.26 5.4 9 <10 6.5 <0.09 1383 1300 439092 64.2547 -141.4517 4.99 5.4 6 <10 4.6 <0.12 1488 1400 439093 64.2436 -141.5003 6.23 6.6 <5 <10 6.6 <0.06 1135 960 439094 64.2381 -141.5581 6.39 6.5 7 <10 6.0 <0.12 920 870 439095 64.2533 -141.6036 6.45 6.8 <5 <10 3.4 <0.09 1117 950 439096 64.2339 -141.6008 6.40 7.5 8 <10 5.4 <0.11 965 1000 439097 64.2542 -141.7208 6.57 7.1 12 <10 6.6 <0.13 900 890 439098 64.2289 -141.7692 6.39 7.1 11 11 5.3 <0.09 672 860 439099 64.2389 -141.7897 7.18 6.7 <5 <10 1.9 <0.12 762 830 439100 64.2192 -141.8097 6.47 6.4 <5 <10 1.7 <0.10 1069 730 439101 64.2322 -142.0678 2.03 2.1 6 <10 2.4 <0.28 <462 680 439111 64.4183 -141.5931 4.80 4.7 <5 <10 2.7 <0.11 1562 1700 439112 64.4133 -141.5367 6.39 6.8 10 <10 4.6 <0.06 1457 1300 439113 64.4175 -141.5539 5.58 5.7 <5 10 5.3 <0.12 1674 1400 439114 64.4569 -141.5344 6.89 6.4 14 12 7.4 <0.12 1345 1300 439115 64.4481 -141.5178 5.65 5.8 14 13 10 <0.11 1336 1600 439120 64.4825 -141.2433 6.45 6.9 9 17 6.4 <0.07 775 740 439121 64.4978 -141.1267 7.25 6.9 20 18 16 <0.13 1782 1500 439123 64.4933 -141.1558 6.11 5.9 13 11 6.8 <0.11 806 850 439133 64.4894 -141.8328 7.38 8.0 <5 <10 4.8 <0.14 1085 1200 439134 64.4856 -141.8575 5.84 5.9 9 12 6.7 <0.12 1161 1200 439136 64.4956 -141.9233 5.87 6.3 10 <10 5.5 <0.07 1526 1300 439137 64.4897 -141.9803 5.07 6.0 10 <10 7.0 <0.13 1433 1200 439138 64.4956 -142.0083 5.54 5.6 9 <10 7.6 <0.10 1174 1000 439140 64.4928 -142.1589 6.01 6.4 8 <10 6.0 <0.06 1638 1500 439181 64.4414 -142.1461 1.76 1.6 6 <10 2.0 <0.18 <313 220 439182 64.4586 -142.0947 2.05 1.8 9 <10 2.1 <0.24 <512 210 

21
Sample ID

439082439083439084439085439086439087439088439089439090439091439092439093439094439095439096439097439098439099439100439101439111439112439113439114439115439120439121439123439133439134439136439137439138439140439181439182

Ce, ppm Co, ppm Co, ppm Cr, ppm Cr, ppm Cs, ppm Cu, ppm Cu, ppm Dy, ppm Eu, ppm 

ICP-AES INAA ICP-AES INAA ICP-AES INAA EDXRF ICP-AES INAA INAA 

72 33 17 104 100 4.6 39 26 5 1.6 57 14 14 72 93 3.1 22 16 4 1.4 46 18 21 157 180 <3.5 33 29 3 0.7 49 14 15 100 100 <1.3 10 12 5 1.1 53 28 17 133 140 <2.6 29 23 4 1.4 52 18 17 75 120 <2.1 32 22 6 1.4 55 16 19 74 73 5.6 22 25 5 1.2 58 14 17 105 120 4.9 29 20 5 1.5 58 31 19 85 92 <2.5 35 39 6 2.2 46 15 16 64 100 3.0 40 27 5 1.4 46 17 21 60 100 3.0 40 34 3 1.3 65 12 14 70 81 <1.4 29 23 5 1.2 69 31 17 80 93 <2.5 22 25 5 1.5 42 19 21 65 91 <2 33 25 4 1.3 63 16 20 72 110 <2.4 21 18 4 1.1 64 33 18 90 110 <2.7 18 20 5 1.8 59 19 18 77 110 <1.9 28 15 4 1.2 30 3 2 <14 17 <2.2 12 14 <2 0.8 27 37 49 43 63 <2.3 24 36 4 1.0 19 65 21 <33 46 <5.3 38 28 <3 <1 47 10 12 54 76 <2.3 41 40 4 1.3 70 10 12 78 100 3.0 26 21 5 1.3 58 28 13 54 72 <2.5 <10 25 3 1.4 96 22 19 115 130 5.5 35 25 7 2.3 61 22 28 151 180 4.6 50 39 4 1.3 59 16 19 135 160 <1.6 26 22 6 1.4 

130 30 16 129 130 5.0 31 25 6 2.4 

60 10 14 79 110 <2.3 30 18 5 1.4 

290 38 19 115 160 <2.9 27 24 11 3.9 

64 23 23 93 140 <2.6 47 31 <3 1.9 64 12 15 60 110 <1.7 50 37 4 1.3 74 41 27 85 99 <2.8 34 24 <2 1.3 80 17 19 83 100 <2.1 17 19 5 1.3 63 14 17 67 110 2.6 57 30 5 1.3 22 12 8 42 45 <3.3 43 40 <3 <0.8 16 9 13 <29 33 <4.2 40 35 <4 <1 

22
Sample ID

439082439083439084439085439086439087439088439089439090439091439092439093439094439095439096439097439098439099439100439101439111439112439113439114439115439120439121439123439133439134439136439137439138439140439181439182

K, % La, ppm La, ppm Li, ppm Lu, ppm Mg, % Mg, % Mn, ppm Mn, ppm Mo, ppm 

ICP-AES INAA ICP-AES ICP-AES INAA INAA ICP-AES INAA ICP-AES ICP-AES 

1.2 35 38 25 0.4 1.20 1.6 945 910 <2 1.3 38 31 22 0.4 1.07 1.2 721 690 <2 1.3 34 24 30 0.4 1.93 2.5 858 810 <2 1.1 22 26 18 0.3 1.29 1.5 783 720 <2 1.5 <18 28 26 0.4 1.47 1.8 987 990 <2 1.4 26 28 22 0.4 1.26 1.8 1058 1100 <2 1.3 28 28 25 0.5 1.36 1.8 1061 1000 <2 1.4 34 31 20 0.5 1.19 1.8 726 770 <2 1.3 37 29 24 0.5 1.18 1.4 1172 1100 <2 1.1 26 26 25 0.4 1.25 1.3 983 950 <2 1.2 22 26 27 0.3 1.25 1.5 1412 1400 <2 1.5 28 36 23 0.4 1.07 1.3 938 900 <2 1.4 49 38 22 0.3 1.01 1.4 1014 940 <2 1.2 19 23 21 0.3 1.00 1.4 879 880 <2 1.6 29 33 23 0.3 1.46 2.0 991 1000 <2 1.5 <18 35 24 0.5 1.30 1.4 979 930 <2 1.3 28 31 21 0.3 1.19 1.4 855 840 <2 1.9 <18 17 19 <0.2 <0.33 0.36 387 350 <2 1.2 <16 15 22 0.3 1.26 1.4 597 540 <2 

0.41 <52 10 9 <0.4 <0.43 0.34 3718 3400 2 0.90 28 25 23 0.3 0.69 1.0 1636 1600 <2 

1.8 38 42 31 0.3 0.67 0.79 438 410 <2 1.5 47 33 30 0.4 0.66 0.99 914 850 <2 1.7 60 53 30 0.4 1.03 1.1 1196 1100 <2 1.9 30 32 34 0.2 1.16 1.5 1663 1700 <2 1.1 36 30 26 0.3 0.89 1.3 816 810 <2 2.1 73 70 35 0.4 0.87 1.2 733 670 4 1.2 33 31 24 0.3 1.00 1.1 519 520 <2 2.2 139 160 37 0.9 0.93 1.1 719 660 <2 1.3 <15 34 26 0.4 0.96 1.1 2295 2200 <2 1.4 32 39 28 0.3 0.82 1.1 810 730 <2 1.3 41 40 25 <0.2 0.98 0.97 4252 4000 <2 1.2 36 44 23 0.3 0.82 0.85 831 810 <2 1.5 29 34 30 0.3 0.66 0.96 799 790 <2 

0.25 <30 11 4 <0.3 0.33 0.27 266 270 <2 0.26 <36 8 4 <0.4 <0.34 0.28 972 910 2 

23
Sample ID

439082439083439084439085439086439087439088439089439090439091439092439093439094439095439096439097439098439099439100439101439111439112439113439114439115439120439121439123439133439134439136439137439138439140439181439182

P, % Pb, ppm Pb, ppm Sb, ppm Sb, ppm Sc, ppm Sc, ppm Se, ppm Sn, ppm Sr, ppm 

ICP-AES EDXRF ICP-AES INAA HG-AAS INAA ICP-AES INAA INAA INAA 

0.11 <5 13 <4 2.3 17.1 19 <5 <10 <261 0.07 7 14 <3 0.74 16.4 16 <5 <10 <239 0.07 <5 13 <5 0.56 18.8 21 <5 <10 <421 0.07 7 10 <2 0.80 18.9 19 <5 <10 <169 0.08 5 12 <4 1.5 18.5 19 <5 <10 <262 0.10 <5 18 <3 2.6 17.2 19 <5 <10 <297 0.15 16 22 <4 3.8 18.7 19 <5 <10 <382 0.19 17 22 5 3.7 15.8 18 <5 <10 <159 0.18 5 17 <4 1.6 21.7 22 <5 <10 <255 0.09 <5 10 <3 1.0 13.5 14 <5 <10 <275 0.08 5 12 <4 0.86 13.4 14 <5 <10 <432 0.10 8 14 <2 0.93 14.6 15 <5 <10 <196 0.11 8 19 <4 0.96 15.9 16 <5 <10 <268 0.07 8 9 <3 0.47 15.2 16 <5 <10 <269 0.16 <5 9 <3 1.1 18.1 20 <5 <10 <338 0.11 6 13 <4 0.93 16.4 16 <5 <10 <269 0.09 6 11 <3 0.82 15.8 17 <5 <10 <254 0.04 6 6 <3 0.57 3.0 3 <5 <10 <397 0.08 <5 4 <3 0.49 16.3 18 <5 <10 <243 0.19 <5 6 <8 0.68 4.8 5 <5 <10 <775 0.11 <5 8 <3 0.48 14.3 14 <5 <10 <435 0.08 24 32 <2 0.64 12.3 12 <5 <10 <166 0.06 -- 14 <4 0.67 11.3 11 -- <10 <261 0.09 <5 16 <4 1.4 15.7 15 <5 <10 <350 0.08 6 17 <3 1.2 13.1 13 <5 <10 <404 0.09 <5 7 <2 1.2 20.2 21 <5 <10 <190 0.10 10 16 <4 3.6 16.7 16 <5 <10 <235 0.08 5 9 <3 0.98 14.7 15 <5 <10 <284 0.13 36 30 <4 1.1 16.6 17 <5 <10 <252 0.12 8 11 <4 0.86 13.5 13 <5 <10 <488 0.10 8 10 <2 0.73 12.5 13 <5 <10 <217 0.08 5 11 <4 0.76 12.8 13 <5 <10 <580 0.07 9 11 <3 0.70 11.4 12 <5 <10 <286 0.08 11 12 <2 0.72 12.3 13 <5 <10 <187 0.09 <5 <4 <5 0.37 4.2 4 <5 <10 <329 0.07 <5 <4 <6 0.37 4.1 4 <5 <10 <651 

24
Sample ID

439082439083439084439085439086439087439088439089439090439091439092439093439094439095439096439097439098439099439100439101439111439112439113439114439115439120439121439123439133439134439136439137439138439140439181439182

U, ppm V, ppm V, ppm Y, ppm Yb, ppm Yb, ppm 

DNC INAA ICP-AES ICP-AES INAA ICP-AES 

3.0 144 140 23 <3.3 2 3.1 106 110 19 4.9 2 2.4 137 130 16 <4.6 2 2.4 131 130 18 5.2 2 2.5 111 120 22 <3.3 2 3.5 119 120 20 <2.4 2 2.5 155 150 20 <3.2 2 3.6 122 130 19 5.4 2 2.9 166 170 25 <3.4 3 2.2 125 120 20 3.3 2 2.1 110 120 19 <3.1 2 2.7 123 120 20 3.9 2 3.1 134 130 22 <3.2 2 1.9 114 120 16 <2.5 2 2.5 170 170 21 <3.6 2 3.8 127 140 21 <3.1 2 3.2 125 140 19 4.5 2 2.1 36 24 7 <3.3 <1 1.5 104 110 22 <2.3 2 0.9 <24 41 15 <7.7 2 2.1 95 99 22 <3 3 3.3 126 120 19 4.7 2 2.7 103 110 17 <3.3 2 4.3 154 140 20 6.7 2 2.3 152 150 12 <3.6 1 2.6 166 170 22 4.4 2 5.3 167 160 21 4.6 2 2.8 118 120 16 4.8 2 5.4 128 120 22 <3.8 3 2.5 110 120 17 <3.3 2 3.0 122 110 23 2.8 2 2.6 101 120 20 <3.7 2 3.1 118 120 18 5.4 2 3.2 115 120 19 3.8 2 0.9 50 47 11 <4.9 1 0.7 48 48 8 <6.4 <1 

25
Table 3: Analytical results for the Eagle 3 o Quadrangle, Fortymile Study Area, AK (previous NUR

Al, % Al, % As, ppm As, ppm As, ppm Au, ppm Ba, ppm Ba, ppm 

 INAA ICP-AES EDXRF ICP-AES HG-AAS INAA INAA ICP-AES 

Sample ID Latitude Longitude

439183 64.4383 -142.0597 1.55 1.2 6 <10 1.4 <0.11 <164 190 439184 64.4628 -141.9894 5.84 5.7 5 <10 2.7 <0.19 706 650 439291 64.1656 -141.4025 4.18 5.3 43 31 25 <0.17 <595 830 439292 64.1703 -141.4117 6.04 6.5 13 <10 9.3 <0.06 952 870 439293 64.2919 -141.4736 6.00 6.4 7 <10 6.4 <0.11 1022 870 439294 64.2967 -141.4572 5.58 6.6 9 <10 6.4 <0.08 781 760 439295 64.3214 -141.4256 7.95 7.5 186 160 160 <0.12 756 720 439296 64.2942 -141.5081 6.05 6.3 9 <10 6.2 <0.05 973 900 439298 64.2956 -141.5594 3.54 3.8 12 10 9.7 <0.18 <337 200 439299 64.2958 -141.5942 6.20 6.8 14 <10 5.6 <0.10 1004 1000 439300 64.2931 -141.6536 3.22 3.6 <5 <10 1.1 <0.07 585 480 439301 64.2733 -141.6975 6.40 7.2 <5 <10 6.5 <0.10 912 1000 439302 64.2800 -141.7344 6.70 6.6 6 <10 2.2 <0.09 988 920 439303 64.2711 -141.7856 6.18 6.2 6 <10 2.2 <0.11 950 850 439304 64.2633 -141.8356 6.03 6.4 8 <10 5.9 <0.05 1075 910 439305 64.2714 -141.8994 6.69 7.0 12 <10 6.2 <0.12 782 800 439306 64.2922 -141.9628 5.84 6.5 10 <10 5.4 <0.08 933 970 439307 64.2992 -141.9761 5.91 6.4 11 <10 6.7 0.39 1203 1300 439308 64.3003 -141.9892 6.11 6.4 <5 <10 3.7 <0.05 1258 1100 439309 64.3294 -141.9756 6.10 7.1 6 <10 3.1 <0.11 909 960 439310 64.3364 -141.9797 5.39 6.5 <5 <10 2.2 <0.08 692 880 439311 64.3475 -142.0050 5.75 5.9 6 <10 2.0 <0.10 625 720 439312 64.3481 -142.0672 6.04 6.3 8 <10 7.6 <0.06 1007 920 439313 64.3581 -142.0033 6.16 6.7 5 <10 2.5 <0.12 719 810 439314 64.3831 -142.0025 5.59 5.6 8 <10 3.9 <0.12 1138 1000 439315 64.3975 -142.0203 5.93 6.0 5 <10 1.5 <0.15 1206 1200 439316 64.4047 -142.0417 2.13 2.6 8 <10 2.7 <0.12 685 540 439317 64.4119 -142.0536 1.16 0.91 5 <10 0.68 <0.38 <332 180 439318 64.4033 -142.0844 5.11 5.7 <5 <10 3.7 <0.10 956 950 439319 64.3961 -142.1631 3.84 4.5 7 <10 3.8 <0.09 1221 1400 439321 64.3889 -142.1656 2.03 2.0 6 <10 2.2 <0.24 411 350 439322 64.3831 -142.1647 1.34 1.4 7 <10 3.9 <0.15 <296 280 439364 64.3328 -142.1822 6.48 6.4 7 <10 3.9 <0.09 1488 1100 439366 64.3217 -142.1311 6.63 6.8 9 <10 5.2 <0.06 2178 1700 439367 64.3158 -142.1506 6.06 6.5 10 <10 5.4 <0.12 1049 1200 439368 64.2800 -142.1369 5.67 6.6 22 12 19 <0.12 1017 860 

26
Sample ID

439183439184439291439292439293439294439295439296439298439299439300439301439302439303439304439305439306439307439308439309439310439311439312439313439314439315439316439317439318439319439321439322439364439366439367439368

Ce, ppm Co, ppm Co, ppm Cr, ppm Cr, ppm Cs, ppm Cu, ppm Cu, ppm Dy, ppm Eu, ppm 

ICP-AES INAA ICP-AES INAA ICP-AES INAA EDXRF ICP-AES INAA INAA 

14 <1.2 5 54 41 <2.3 38 30 <1 <0.3 44 45 15 79 100 <3.9 29 25 3 <0.6 

110 36 44 57 91 <3.6 28 27 6 1.8 

70 14 18 62 81 <1.3 18 15 5 1.1 96 27 16 101 110 <2.4 <10 15 6 1.6 

140 17 17 138 150 <1.7 20 16 7 1.5 

92 10 11 58 69 14.6 12 17 5 1.6 89 11 14 68 87 <1.1 18 14 5 1.2 41 19 13 62 77 <3.6 23 25 6 <0.8 63 13 17 70 110 3.2 27 23 5 1.3 22 5 6 32 56 <1.6 15 19 2 <0.2 62 26 16 73 95 4.1 22 16 4 1.4 57 7 7 <10 97 <1.7 16 20 <2 1.1 39 7 5 56 49 <2.3 21 13 4 1.4 

100 13 16 79 110 2.3 24 18 6 1.2 

75 31 18 72 96 <2.5 23 14 5 1.6 

140 15 14 79 110 <1.8 23 15 7 1.7 

95 11 13 63 81 2.9 24 24 6 1.4 56 8 9 51 74 2.7 33 29 5 1.1 68 33 23 79 100 <2.5 26 21 4 1.5 50 17 17 64 95 <1.8 27 25 4 1.1 51 15 20 95 130 <2.1 40 29 3 0.9 48 11 14 58 92 <1.4 36 29 4 1.1 60 30 19 77 94 <2.6 24 20 5 1.9 41 16 12 50 72 <2.5 42 45 4 1.0 53 8 9 47 86 <3.1 34 28 4 1.1 66 8 13 35 51 <2.5 103 100 6 1.2 

7 74 3 <45 23 <7.3 18 13 <3 <1.3 

35 13 11 40 73 <2.1 29 27 4 0.9 37 11 15 52 92 <1.8 23 18 3 0.9 14 55 6 <29 29 <4.8 29 25 <2 <0.8 11 14 10 <18 35 <2.9 23 15 <3 <0.7 53 15 15 71 99 <1.9 33 23 5 1.1 64 12 16 60 110 3.6 35 23 5 1.2 50 31 20 101 120 <2.5 29 26 5 1.7 61 36 43 73 95 <2.5 24 20 6 1.7 

27
Sample ID

439183439184439291439292439293439294439295439296439298439299439300439301439302439303439304439305439306439307439308439309439310439311439312439313439314439315439316439317439318439319439321439322439364439366439367439368

K, % La, ppm La, ppm Li, ppm Lu, ppm Mg, % Mg, % Mn, ppm Mn, ppm Mo, ppm 

ICP-AES INAA ICP-AES ICP-AES INAA INAA ICP-AES INAA ICP-AES ICP-AES 

0.23 <21 8 3 <0.1 <.021 0.32 235 200 3 

1.0 <33 24 17 <0.3 1.04 1.2 596 620 <2 

0.93 53 53 20 0.6 <0.53 0.88 4982 4700 2 

1.3 35 38 22 0.2 1.08 1.1 1017 970 <2 1.4 48 53 20 0.5 0.91 1.3 1089 1100 <2 1.3 63 76 18 0.6 1.15 1.5 1199 1300 <2 2.0 58 52 98 0.6 0.87 0.99 897 840 <2 1.5 40 48 22 0.4 1.12 1.3 963 930 <2 

0.85 <29 23 15 <0.3 0.52 0.71 387 400 2 

1.5 28 33 25 0.4 1.05 1.4 917 900 <2 

0.68 <12 12 10 <0.1 0.40 0.52 241 230 <2 

1.8 45 31 24 0.5 0.99 1.3 1017 1000 <2 1.7 25 30 22 <0.1 <0.27 0.97 378 510 2 1.6 35 22 21 0.3 1.01 0.74 578 440 <2 1.5 52 53 25 0.4 1.06 1.3 1008 960 <2 1.3 30 41 20 0.4 1.04 1.3 938 920 <2 1.4 64 74 22 0.4 0.99 1.3 945 1000 <2 1.8 34 50 32 0.6 0.70 1.0 873 870 <2 1.7 27 31 31 0.4 0.81 1.0 529 540 <2 1.3 28 35 19 0.5 1.38 2.3 1301 1300 <2 1.0 21 26 17 0.3 1.45 2.1 967 1100 <2 

0.91 <8 25 22 0.3 1.39 1.8 869 850 <2 

1.2 16 25 21 0.2 0.89 1.3 523 540 <2 1.1 34 32 17 0.4 1.81 2.4 1185 1200 <2 1.1 <17 23 23 <0.2 0.97 1.2 510 500 <2 1.5 31 30 27 0.3 0.62 0.89 466 440 <2 

0.38 <19 35 8 <0.1 <0.27 0.34 1082 1100 3 0.19 <67 5 2 <0.6 <0.24 0.28 110 120 <2 

1.1 <14 19 17 0.3 0.58 0.72 557 550 <2 1.1 17 20 22 0.2 0.61 0.78 1124 1200 <2 

0.33 <45 8 4 <0.3 0.59 0.36 322 330 <2 0.29 <24 6 4 <0.2 <0.21 0.30 494 490 3 

1.5 28 29 30 0.4 1.02 1.2 662 660 <2 1.6 32 33 37 0.3 0.93 1.2 874 850 <2 1.5 <18 27 36 <0.1 1.07 1.5 1013 1000 <2 1.3 <14 31 19 0.3 1.43 2.4 1846 2000 <2 

28
Sample ID

439183439184439291439292439293439294439295439296439298439299439300439301439302439303439304439305439306439307439308439309439310439311439312439313439314439315439316439317439318439319439321439322439364439366439367439368

P, % Pb, ppm Pb, ppm Sb, ppm Sb, ppm Sc, ppm Sc, ppm Se, ppm Sn, ppm Sr, ppm 

ICP-AES EDXRF ICP-AES INAA HG-AAS INAA ICP-AES INAA INAA INAA 

0.13 <5 <4 <3 0.20 3.5 3 <5 <10 <230 0.11 5 7 <6 0.67 13.2 13 <5 <10 <324 0.17 <5 25 <5 0.98 11.8 12 <5 <10 <989 0.09 <5 13 <2 1.2 12.7 14 <5 <10 <205 0.14 6 16 <3 0.92 17.1 17 <5 <10 <254 0.12 5 17 <2 0.98 16.7 19 <5 <10 <256 0.09 29 47 <4 1.8 15.1 15 <5 <10 <357 0.13 5 13 <2 0.99 13.9 16 <5 <10 <168 0.10 <5 10 <5 0.70 7.8 8 <5 <10 <371 0.11 <5 11 <3 0.91 14.6 15 <5 <10 <329 0.08 <5 <4 <2 0.54 6.2 7 <5 <10 <178 0.11 9 11 <3 0.91 15.2 15 <5 <10 <233 0.09 6 9 <3 0.67 3.5 11 <5 <10 <287 0.07 <5 7 <3 0.61 13.0 8 <5 <10 <295 0.12 7 12 <2 0.85 13.4 15 <5 <10 <197 0.07 <5 10 <3 0.68 15.8 16 <5 <10 683 0.15 <5 9 <3 0.73 16.1 17 <5 <10 <245 0.13 10 14 <3 0.57 15.1 15 <5 <10 <286 0.11 10 11 <2 0.47 12.9 14 <5 <10 <142 0.17 <5 8 <3 0.41 22.5 24 <5 <10 <266 0.10 <5 7 <3 0.38 20.5 23 <5 <10 <231 0.08 8 9 <3 0.20 14.3 15 <5 <10 <303 0.09 7 8 <2 0.75 12.6 14 <5 <10 <167 0.16 5 8 <4 0.38 21.8 22 <5 <10 450 0.11 <5 6 <4 0.61 12.0 12 <5 <10 <281 0.09 <5 10 <5 0.48 12.0 12 <5 <10 <360 0.14 <5 6 <4 0.35 5.6 7 <5 <10 <387 0.10 <5 <4 <10 <0.20 1.8 <2 <5 <10 <343 0.08 <5 8 <3 0.65 9.2 10 <5 <10 <260 0.08 <5 7 <3 0.68 9.9 11 <5 <10 <320 0.10 <5 <4 <7 0.30 3.1 3 <5 <10 <298 0.10 <5 5 <4 0.27 3.1 3 <5 <10 <339 0.07 7 12 <3 0.57 14.3 15 <5 <10 <240 0.08 6 13 <2 0.61 15.5 18 <5 <10 355 0.09 <5 14 <4 0.51 16.7 16 <5 <10 <253 0.21 <5 18 <4 0.50 17.7 21 <5 <10 <398 

29
Sample ID

439183439184439291439292439293439294439295439296439298439299439300439301439302439303439304439305439306439307439308439309439310439311439312439313439314439315439316439317439318439319439321439322439364439366439367439368

U, ppm V, ppm V, ppm Y, ppm Yb, ppm Yb, ppm 

DNC INAA ICP-AES ICP-AES INAA ICP-AES 

1.1 32 31 7 <2.8 <1 2.2 107 100 15 <5.3 1 3.4 124 150 29 <4.3 3 3.0 125 120 19 5 2 4.6 155 160 26 6.5 3 4.8 182 210 31 5.8 3 

17.9 95 99 26 5.9 3 

3.6 125 140 25 5 3 2.6 64 73 15 <4.9 1 2.7 121 130 21 5.1 2 1.3 55 57 8 <1.8 <1 2.8 120 120 19 5.6 2 2.0 31 85 15 <2.4 2 2.8 107 62 11 4.7 1 3.8 131 130 21 4.4 2 2.8 112 120 22 <3.3 2 4.8 126 140 27 5.7 3 4.4 109 110 31 5.1 3 3.2 94 100 22 5 2 2.3 183 200 27 <2.7 3 1.6 156 170 25 <2.7 2 1.7 114 120 18 <2.7 2 2.2 127 140 17 3.6 2 2.5 160 180 27 7.9 3 2.8 104 100 18 <3.2 2 2.4 110 110 17 <4.2 2 2.1 42 43 31 <3.1 3 0.4 <9 17 2 <10.1 <1 2.0 84 84 16 <2.7 1 2.3 118 120 16 3.9 2 0.8 29 31 5 <6.6 <1 2.0 22 30 5 <4 <1 2.7 123 130 17 <2.2 2 3.3 127 120 22 4.8 2 2.6 130 130 18 <3 2 2.3 213 240 23 <3.1 3 

30
Table 3: Analytical results for the Eagle 3 o Quadrangle, Fortymile Study Area, AK (previous NUR

Al, % Al, % As, ppm As, ppm As, ppm Au, ppm Ba, ppm Ba, ppm 

 INAA ICP-AES EDXRF ICP-AES HG-AAS INAA INAA ICP-AES 

Sample ID Latitude Longitude

439369 64.3178 -141.8031 6.19 6.7 15 11 10 <0.14 796 810 439370 64.3278 -141.7914 6.46 7.4 15 <10 3.4 <0.06 1204 1100 439371 64.3153 -141.7561 6.42 7.4 <5 <10 3.5 <0.12 1000 960 439372 64.3242 -141.7383 6.20 6.9 9 <10 5.2 <0.09 1096 880 439373 64.3219 -141.6136 6.50 7.4 9 <10 6.6 <0.13 823 910 439374 64.3758 -141.5006 1.53 1.7 6 <10 1.4 <0.09 1590 1500 439375 64.3797 -141.5661 3.86 3.8 8 <10 4.5 <0.26 1148 770 439376 64.3672 -141.5972 6.23 6.8 8 <10 4.2 <0.09 1220 1200 439377 64.3781 -141.6342 4.58 5.3 9 <10 7.5 <0.12 742 900 

439378 64.3797 -141.6844 4.53 5.4 6 <10 3.7 <0.05 1120 960 439379 64.3719 -141.8119 5.38 5.6 6 <10 4.3 <0.11 941 790 439380 64.3703 -141.7914 5.57 6.5 8 <10 4.7 <0.09 955 860 439381 64.3697 -141.8833 4.62 5.2 6 <10 3.5 <0.13 922 960 439382 64.3747 -141.8953 5.43 6.1 9 <10 4.0 <0.06 1315 1200 439383 64.3936 -141.8892 4.70 5.3 8 <10 4.5 <0.10 879 1000 439384 64.4036 -141.9039 5.19 5.8 28 21 22 <0.08 1230 1200 439385 64.4300 -141.8250 6.27 6.8 10 <10 5.3 <0.11 922 990 439386 64.4281 -141.8494 4.25 4.7 7 <10 5.4 <0.04 1710 1700 439387 64.4231 -141.7681 4.71 5.4 13 12 6.9 <0.14 1254 1100 439388 64.4264 -141.7183 5.98 5.7 25 <10 6.8 <0.17 <2123 2300 439390 64.4022 -141.6206 4.60 5.5 <5 <10 3.9 <0.11 1679 1600 439391 64.1736 -142.1278 6.80 7.0 <5 <10 3.8 <0.06 882 830 439392 64.1867 -142.1617 7.20 7.4 8 <10 7.5 <0.12 1107 1000 

31
Sample ID

439369439370439371439372439373439374439375439376439377439378439379439380439381439382439383439384439385439386439387439388439390439391439392

Ce, ppm Co, ppm Co, ppm Cr, ppm Cr, ppm Cs, ppm Cu, ppm Cu, ppm Dy, ppm Eu, ppm 

ICP-AES INAA ICP-AES INAA ICP-AES INAA EDXRF ICP-AES INAA INAA 

46 22 26 65 96 <3 22 14 5 0.9 53 18 23 71 110 2.4 14 22 4 1.3 60 36 26 87 110 <2.6 33 15 5 1.4 41 17 17 68 110 3.6 33 23 4 1.3 44 17 24 87 130 4.6 36 23 4 1.5 19 20 30 <10 34 <2 49 48 <1 1.0 32 56 14 57 70 <5 88 76 7 1.5 53 14 13 59 84 2.2 28 18 6 1.2 38 11 16 48 93 <2.3 21 24 4 1.2 41 10 14 49 87 <1.2 24 24 4 1.0 43 26 10 59 81 <2.3 16 15 3 1.1 42 18 17 57 87 <2 22 19 4 1.2 49 11 15 56 76 <2.5 33 22 4 1.2 51 15 21 40 67 <1.5 48 36 4 1.2 50 24 12 57 75 <2.1 18 18 3 1.4 35 13 13 29 46 <1.6 30 32 3 0.9 72 11 12 101 93 <2.3 23 15 6 1.2 46 12 20 54 100 2.1 44 27 3 1.1 54 39 23 74 120 <2.9 37 27 5 1.7 

220 579 820 56 110 <3.6 90 91 28 5.2 

42 14 20 137 140 <2.1 33 28 4 1.3 53 12 16 63 88 2.5 28 21 5 1.1 44 38 24 76 79 <2.7 27 30 4 1.4 

32
Sample ID

439369439370439371439372439373439374439375439376439377439378439379439380439381439382439383439384439385439386439387439388439390439391439392

K, % La, ppm La, ppm Li, ppm Lu, ppm Mg, % Mg, % Mn, ppm Mn, ppm Mo, ppm 

ICP-AES INAA ICP-AES ICP-AES INAA INAA ICP-AES INAA ICP-AES ICP-AES 

1.1 23 26 23 <0.2 1.33 1.6 1009 940 <2 1.6 22 29 26 0.4 1.94 2.6 1215 1200 <2 1.6 31 32 21 0.3 2.06 2.7 1341 1300 <2 1.1 23 22 24 0.3 1.28 1.6 992 980 <2 1.3 28 22 26 0.3 1.11 1.6 1261 1200 <2 

0.31 <15 14 5 0.2 <0.31 0.40 2438 2300 <2 0.76 <48 34 14 <0.4 <0.31 0.68 1066 970 3 

1.1 36 28 22 0.4 0.90 1.2 922 930 <2 1.0 21 22 20 0.2 1.44 2.2 870 870 <2 1.1 24 22 19 0.2 1.71 2.2 703 730 <2 

0.98 <19 23 19 0.4 0.92 1.1 578 530 <2 

1.2 24 23 21 0.3 1.17 1.6 1221 1300 <2 

0.92 23 26 17 0.3 1.41 2.0 1130 1100 <2 0.91 22 27 21 0.3 1.50 2.0 1961 2000 <2 0.96 <16 29 17 0.3 1.07 1.2 779 770 <2 

1.2 16 21 22 0.2 1.13 1.3 708 710 <2 1.5 45 39 24 0.5 0.98 1.1 917 850 <2 1.2 20 26 27 0.2 0.71 0.80 1269 1300 2 1.0 <22 27 23 <0.2 0.75 0.94 1042 980 <2 1.4 122 120 40 0.9 <2.11 1.0 24070 21000 5 1.1 20 22 23 0.3 1.18 1.4 1181 1200 <2 1.3 28 28 21 0.3 1.16 1.5 828 840 <2 1.3 <18 23 21 0.4 1.56 1.5 1063 1000 <2 

33
Sample ID

439369439370439371439372439373439374439375439376439377439378439379439380439381439382439383439384439385439386439387439388439390439391439392

P, % Pb, ppm Pb, ppm Sb, ppm Sb, ppm Sc, ppm Sc, ppm Se, ppm Sn, ppm Sr, ppm 

ICP-AES EDXRF ICP-AES INAA HG-AAS INAA ICP-AES INAA INAA INAA 

0.15 <5 11 <4 0.67 15.7 16 <5 <10 <426 0.18 <5 8 <2 0.99 19.5 23 <5 <10 <216 0.21 <5 11 <4 0.64 22.5 24 <5 <10 479 0.11 6 8 <3 0.99 18.2 18 <5 <10 <264 0.10 <5 10 <4 0.84 18.2 19 <5 <10 <418 0.19 <5 8 <3 0.48 4.0 5 <5 <10 <484 0.09 <5 10 <7 1.1 8.3 8 <5 <10 <449 0.10 7 8 <3 0.64 15.4 16 <5 <10 <271 0.10 <5 9 <4 1.3 12.4 13 <5 <10 <353 0.09 <5 8 <2 0.91 12.2 14 <5 <10 <171 0.08 <5 8 <3 0.99 11.1 11 <5 <10 <220 0.11 <5 8 <3 0.85 15.9 16 <5 <10 <292 0.10 <5 8 <4 0.64 15.9 16 <5 <10 <396 0.12 <5 9 <2 0.32 18.1 22 <5 <10 <266 0.07 <5 7 <3 0.64 11.3 11 <5 <10 <231 0.07 <5 6 <2 0.50 10.9 12 <5 <10 <227 0.11 <5 10 <3 0.82 14.4 14 <5 <10 <339 0.08 <5 9 <1 0.67 9.3 11 <5 <10 <187 0.09 <5 10 <4 0.82 11.4 11 <5 <10 <295 0.08 <5 24 <5 1.0 10.0 11 <5 <10 -- 0.08 5 8 <3 0.60 13.4 14 <5 <10 <361 0.10 10 10 <2 0.54 15.2 17 <5 <10 <188 0.10 11 10 <4 0.75 18.2 19 <5 <10 <288 

34
Sample ID

439369439370439371439372439373439374439375439376439377439378439379439380439381439382439383439384439385439386439387439388439390439391439392

U, ppm V, ppm V, ppm Y, ppm Yb, ppm Yb, ppm 

DNC INAA ICP-AES ICP-AES INAA ICP-AES 

2.3 193 180 16 <3.8 2 2.5 190 200 22 3.7 3 2.6 204 220 23 <3.2 3 2.3 147 160 21 <2.4 2 2.2 134 140 21 4.7 2 2.1 <19 32 17 <2.4 2 

21.4 71 72 41 <7 4 

3.0 111 120 20 <2.6 2 2.5 111 120 17 <3.2 2 2.2 108 130 16 2.7 2 2.8 98 93 15 <3.1 2 2.2 134 140 18 <2.2 2 2.2 134 130 22 <3.4 2 1.7 163 170 27 <2 3 2.2 87 89 19 <2.8 2 1.5 86 91 17 <2 1 3.7 123 110 20 6.4 2 2.5 124 130 18 <1.2 2 2.8 115 110 18 <3.8 2 

12.0 <121 110 150 8.6 8 

2.1 112 120 19 4.5 2 2.6 121 130 20 3.3 2 2.5 157 160 19 <3.4 2 

35