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1977, According to a Texas Instruments Proposal STATE OF ALASKA DEPARTMENT OF NATURAL RESOURCES DIVISION OF GEOLOGICAL AND GEOPHYSICAL SURVEYS Robert E. LaResche - Commissioner Ross G. Schaff - State Geologist This is a preliminary publication of the Alaska Division of Geological and Geophysical Surveys and as such has not received final editing and review. It may be quoted only through permission of the author and State Geologist. The author will appreciate candid comments on the accuracy of the data, and welcomes suggestions that will improve the report. Alaska Open-File Report 109 INVESTIGATION OF ALASKA'S URANIUM POTENTIAL By G.R. Eakins, B.K. Jones and R.B. Forbes INVESTIGATION OF ALASKA'S URAIVIUM POTENTIAL Part f - Reconnaissance Program. West-Central Alaska and Copper River Basin By Gilbert R. Eakins Originally prepared as a Summary Report for the U.S. Energy Research and Development Administration-Grand Junction Office- under Contract AT(05-1)-1639 TABLE OF CONTENTS Page Acknowledgments- - - - - - - - - - - - 1 ntroduct ion - - - - - - - - - - - - - Areas of investigation - - - - - - - - Field methods employed - - - - - - - - Stream-sediment sampling- - - - - Water sampling- - - - - - - - - - Bedrock sampling- - - - - - - - - Ground radiometric survey - - - - Aerial radiometric survey - - - - Sumniary of results - - - - - - - - - - Granite Mountain area - - - - - - Stream-sediment sampling - - Hater sampling - - - - - - - Bedrock sampling - - - - - - Aerial radiometruc survey- - Ground radiometric survey- - Suggestions for exploration- The Darby Mountains - - - - - - - Stream-sediment sampling - - Water sampling - - - - - - - Bedrock sampl ing - - - - - - Aerial radiometric survey- - Ground radiometric survey- - Suggestions for exploration- Selawik Hills area- - - - - - - - Stream-sediment sampling - - Water sampling - - - - - - - Bedrock sampling - - - - - - Aerial radiometric survey- - Ground radiometric survey- - Suggest ions for exploration- The Zane Hills area - - - - - - - Stream-sediment sampling - - Water sampling - - - - - - - Bedrock sampling - - - - - - Aerial radiometric survey- - Ground radiometric survey- - Suggest ions for explorat ion- Copper River basin- - - - - - - - Stream-sediment sampling - - Water sampling - - - - - - - Bedrock sampling - - - - - - Aerial radiometric survey- - Ground radiometric survey- - Suggestions for exploration- The Chitina River valley- - - - - Stream-sediment sampling - - Water sampling - - - - - - - Bedrock sampling - - - - - - Aerial radiometric survey- -- Ground radiometric survey- - Suggest ions for exploration- Eagle-Charley River area- - - - - - - - - - - - - - - - - - - Stream-sediment sampling - - - - - - - - - - - - - - - - Water sampling- - - - - - - - - - - - - - - - - - - - - Bedrock sampling- - - - - - - - - - - - - - - - - - - - Aerial radiometric survey- - - - - - - - - - - - - - - - Ground radiometric survey- - - - - - - - - - - - - - - - Suggestions for exploration- - - - - - - - - - - - - - - Healy D-1 quadrangle and vicinity - - - - - - - - - - - - - - Stream-sediment sampling - - - - - - - - - - - - - - - - Suggestions for exploration- - - - - - - - - - - - - - - qonclusions- - - - - - - - - - - - - - - - - - - - - - - - - - - - References - - - - - - - - - - - - - - - - - - - - - - - - - - - - APPENDIX A-Stream-sediment-, rock-, and water-sample analyses with radiometric data - - - - - - - - - - - - - - - - - - - - - APPENDIX B-Histograms- - - - - - - - - - - - - - - - - - - .- - - - APPENDIX C-Correlation matrix- - - - - - - - - - - - - - - - - - - APPENDIX D-Determination of thorium, uranium, and potassium oxide in stream sediments and rocks - - - - - - - - - - - - - - APPEIJDIX E-General geology of areas investigated - - - - - - - - - l LLUSTRAT l ONS Plate 1. Western Candle quadrangle: Sample locations, gen- eralized geology, and aerial radiometric survey data- - - - - - - - - - - - - - - - - - - - - - - - - In pocket 2. Eastern Solomon and southeastern Bendeleben quad- rangles: Sample locations, generalized geology, and aerial radiometric data - - - - - - - - - - - - - In pocket 3. Selawik Hills area: Sample locations, generalized geology, and aerial radiometric data- - - - - - - - - In pocket 4. Zane Hills and Purcell Mountains area: Sample locations, generalized geology, and aerial radio- metricdata - - - - - - - - - - - - - - - - - - - - - In pocket 5. Eastern Talkeetna Mountains and southwestern Gulkana quadrangles: Sample locations, generalized geology, and aerial radiometric data- - - - - - - - - In pocket 6. Southern and northwestern McCarthy quadrangles: Sample locations and generalized geology- - - - - - - In pocket 7. Eastern and northern Valdez quadrangles: Sample locations and generalized geoloqy - - - - - - - - - - In pocket 8. Eagle and Charley River area: Sample locations and generalized geology - - - - - - - - - - - - - - - In pocket 9. Healy D-1 quadrangle and vicinity: Sample locations and generalized geology - - - - - - - - - - - - - - - In pocket 10. Central Mt. Hayes quadrangle (~ichardson~ighway):, Sample locations and generalized geology- - - - - - - In pocket Figure 1. Index map of areas investigated for uranium by DGGS, 1975- - - - - - - - - - - - - - - - - - - - - - - - - 2. Plutons of west-central Alaska; after Miller and Bunker, 1975- - - - - - - - - - - - - - - - - - - - - 3. Ground radiometric survey of the Granite Mountain area, Candle 6-5 quadrangle - - - - - - - - - - - - - Figure 4. Ground radiometric survey of the Hunter Creek pluton, Candle C-5 and C-6 quadrangles - - - - - - - - 18 Ground radiometric survey of the northern part of the Hunter Creek pluton, Candle D-5 quadrangle- - - 13 Generalized geology of the Darby Mountains area- - - - - 22 Location of mineralized areas and analyzed samples referred to in table 3 - - - - - - - - - - - - - - - - 2 4 Ground radiometric survey of the southern Darby Mountains area, Solomon 6-2 and C-2 quadranales- - - - 27 Ground radiometric survey of the northern Darby Mountains- - - - - - - - - - - - - - - - - - - - - - - 28 Ground radiometric survey of the Selawik Hills, Selawik A-3 and A-4 quadrangles- - - - - - - - - - - - 32 Ground radiometric survey of the western Selawik Hills, Selawik 8-3 quadrangle - - - - - - - - - - - - - - - - 3 3 Ground radiometric survey, Selawik Hills--Inland Lake area, Selawik A-2 and 6-2 quadrangles- - - - - - - - - 34 Ground radiometric survey of the southern Zane Hills, Hughes A-6 and Shungnak A-1 quadrangles- - - - - - - - 37 Ground radiometric survey of the northern Zane Hills, Hughes 6-6 and Shungnak 6-1 quadrangles- - - - - - - - 3 8 Ground radiometric survey of the Purcell Mountains, Shungnak A-3, A-4, 6-3, and 6-4 quadrangles- - - - - - 39 lndex map of the Copper River basin and Chitina River valley sample areas, south-central Alaska- - - - - - - 11 1 lndex map of the Eagle-Charley River sample area, east- central Alaska - - - - - - - - - - - - - - - - - - - - 47 lndex map of the Healy D-1 sample area, north flank of the central Alaska Range- - - - - - - - - - - - - - 49 TABLES Table 1. Mineral composition of sample 5E1R - - - - - - - - - - - 14 2. Mineral composition of sample 5~4R- - - - - - - - - - - 15 3. Uranium and thorium analyses of samples from the Kachauik pluton- - - - - - - - - - - - - - - - - - - - 26 4. Sample locations, Eagle-Charley River area - - - - - - - 4 5 ADDENDUM Two types of analyses for uranium in the stream-sediment samples are presented. One split of the stream-sediment samples was sent to Resource Associates of Alaska's laboratory, where they were analyzed for U by the fluormetric method after acid extraction. This is the niethod employed for U by most laboratories. The completeness of uranium extraction unavoidably varies with the particular type of uranium-bearing minerals present and possibly with the amount of iron, manganese, and carbonaceous material pres- ent, which can interfere with the extraction. Analyses by the niethod are shown in the text and appendix columns with the designation "RAA." Splits of most of the stream-sediment samples were also analyzed by Los Almos Scientific Laboratory's (LASL) under their ERDA-sponsored Hydro- chemical and Stream-sediment Reconnaissance Program. Analyses at LASL were performed by the delayed-neutron counting method, which gives total uranium. This method can be used only if a reactor is available. Samples analyzed by this method are prefaced by the designation "LASL." To provide as much information as possible and to illustrate what can be expected by the two different analytical methods, results of both are tabulated in the tables of analyses. It should be emphasized that the chemical analyses were monitored and frequently checked. Differences such as those shown between the chemical-fluormetric method and delayed- neutron counting, according to LASL, are normal and to be expected. ABSTRACT The Alaska Division of Geological and Geophysical Surveys (DGGS), under ERDA contract ~~(05-1)- 1639, conducted a 6-week reconnaissance program in west-central Alaska and in the Copper River basin-Chitina River valley area to aid in determining the uranium potential of the state. Division personnel also submitted samples from the Healy, Eagle, and Charley River quadrangles. DGGS personnel collected 916 stream-sediment samples and 427 bed- rock samples for uranium, thorium, and potassium oxide determinations, and 565 water samples for uranium analyses. A statistical analysis of the determinations was made using a computer at the University of Alaska The means, thresholds, anomalies, and U:Th ratios were calculated
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