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Tea Piute Range in the west-central part of Lincoln County, ffevada, approximately 85 mile* vest of Caliente, 100 Biles east of Tonopah, and 160 Biles north of Las Yogas. The district is reached by 40 Biles of desert road froB B. S. Highway 93 at Crystal, near Hiko. The deposits

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Introduction __ ______________ __ __________ _ 238 Purpose of the investigation.___ _ _ __ 239 Field work and acknowledgments _ __. ____ _ 239 Previous work._ __._ _____________ _____________ ___ 239 Location and physiography __________ ____________ ______ 240 Accessibility_____________________.___._________ 240 General geology 241 Sedimentary rocks-_ ____________________ __ ___ 241 Igneous rocks______ _________________ _________ ___ 242 Structure______________ _ _ _ _ _. 242 Geologic history 243 Radioactivity.- .-__ __________________________ ____ 244 Uranium deposits 245 Uraniferous lignite. _________________________________ _ 246 Distribution______________________________ 246 Geology_________________________________ 248 Radioactivity.-________________________ _ ______ 250 Origin______.__ ..________.____________-_ 253 Lost Creek schroeckingerite deposit______________________ 254 Location and history _ ______________ ____ 254 Geologic setting. _______ ________ _________ ______ 256 Mineralogy _______ ___ _________ _.__-. 260 Schroeckingerite_______________________________ Other uranium minerals._________________________ Ore bodies___________._____________._____.-Grade_________.._____________________... Auger-testing program of 1950__ __ Sampling and logging procedures__________________-_____ Geologic results.._______________________ Distribution of uranium____________________________ Origin___________________________________ Aids to prospecting______________________________________ Future outlook__________________________________ Literature cited.._______________________________ Stratigraphic sections... _________ ___ _ _ Analyses....______________________________________________ Auger-hole data.____________________________________________ Index________________________________________ 307 m Page TABLE 1. Comparison of radioactivity measurements, Red Desert,Wyo_ 245 2. Summary of paleontologic data, Red Desert, Wyo______ 249 3. Analyses of material other than lignite, carbonaceous shale, schroeckingerite, or water, Red Desert, Wyo_____________ 4. Analyses of water samples (ppm), Red Desert, Wyo__-___._ 5. Spectrographic analyses (in percent), of uraniferous lignite, Red Desert, Wyo____________________________ 284 6. Analyses of radioactive lignite, carbonaceous shale, clinker, and ash, Red Desert, Wyo_______________-7. Analyses of rock samples, Lost Creek schroeckingerite deposit.