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| Deposits Central Part of the Front Range Mineral Belt Colorado By P. K. SIMS and others GEOLOGICAL SURVEY PROFESSIONAL...______________________________ _ History of uranium mining and production ____________ _ Geologic setting..._ _ Uranium-bearing pegmatite _____________ _ Biotite..m uscovite granite _______________ _ Tertiary...__________ - ___ - ________ -----------Central City district _____________________ ------Quartz Hill-upper... _ West Flack mine __________________ _ ~ercer County mine ______________ -German and Belcher mines ______________ |
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| (A) Geology of Precambrian rocks, Idaho Springs district, Colorado, by Robert H. Moench. (B) Geology... Geology of Precambrian Rocks, Idaho Springs District, Colorado By ROBERT H. MOENCH CONTRIBUTIONS...____________ Biotite gneiss__ __________ __________________ __ _____ ______ _ _ Biotite-quartz-plagioclase... gneiss_________________________ Sillimanitic biotite-quartz gneiss_________________________ Granite...Microcline gneiss (microcline-quartz-plagioclase-biotite gneiss)___ Quartz gneiss ________________________________ |
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| Geology of Uranium Deposits in the Front Range, Colorado By P. K. SIMS and D. M. SHERIDAN With sections...mines_______________________________________ Boulder CountY----------------------------------~-----------Jamestown...Description of principal mines-Continued Boulder County-Continued Other areas __________________________...____________ Clear Creek CountY------------------------------------------Idaho Springs and adjacent ...__________ ------_____________________ 71 72 Gilpin CountY-----------------------------------------------Central |
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| given and is compared with the percentages of biotite, potash, and ferrous oxide in these granites. In...the total amount of radium increases with the biotite content. No correlation was found between radium...high of 4.56 alphas per mg per hr in samples of biotite granite. The radioactivity of individual rock specimens...associated with a decrease in the potash feldspar, biotite, and apatite content; it is caused primarily by...increase is not caused by an increase in potash or biotite content (references 7 and 21). Except for the White |
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| Geology and Ore Deposits of the Front Range Colorado By T. S. LO\'ERING and E. N. GODDARD GEOLOGICAL...cooperation with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund ~ oopr is...__________________________________________ _ 1 Summary of mining districts---.---------------------Introduction...Metamorphic rocks ________________________ _ Idaho Springs formation _______________ _ Swandy ke hornblende...hornblende gneiss ____________ _ Quartzite at Coal Creek ________________ _ Igneous rocks _____________________________ |
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| ................... THE GEOLOGY OF THE LINCOLN TUNNEL, PART 4. 234 By Thomas W. Ftuhr .................................. MINERALS OF THE BlJ'I"I E DISTRICT. By Peter A. S111ith ..... .... A MINERAL TRIP...ASSOCIATION Whole No. 120 THE GEOLOGY OF THE LINCOLN TUNNEL PART4 By THOMAS W. FLUHR The Under-River Section...approximately 25% of the silt was allowed to enter the tunnel while 75 % was displaced and pushed aside by the...into the tunnels was allowed to remain until the tunnel had been completed. The weight of this silt tended |
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| ...... ·- ......... . J,5 Historical sketch of mining and smelting in New Mexico....... . . . . . . ...::::::.:::::::::::: :·:.: : . :.:.:: The hot springs at Ojo Oaliente and their deposits .................. : . .............. - ........ .. . . T~os County, by L. C. Graton and W ..Lindgren ..... ................. . . , ... -.. . Rio Hondo. (Twining) district . . . . . . . . . . . . . ......................::.:::.::: ::: :::: :: ':::: :: ::::. Red River district. ..................•......... -~ . . ........ |
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| ................... THE GEOLOGY OF THE LINCOLN TUNNEL. PART 1. By T homas W. Fluhr ....................specimens whose localities are given simply as a county or province, or what is worse yet, state or country...GEOLOGY OF TH E LINCOLN TUNNEL Part 1 By THOMAS W. FLUHR The Lincoln Tunnel crosses the Hud- up sections...project. The Lincoln Tun• ways, Park Ave. and Hudson County nel embraces a complicated system of via- Boulevard...means of a complicated system of apThe Lincoln Tunnel project, at first proach ramps and a bridge. These |
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| Resource Data File LG001 Site name(s): Troublesome Creek Site type: Mine ARDFno.: LG001 Latitude: 65.506...placer mine is along Troublesome Creek, just below the mouth of Union Creek; NW1/4SW1/4 sec. 22, T. 8 N....found in Troublesome Creek (Prindle and Katz, 1913, p. 146). Both prospecting and mining have been reported...p. 192). A sample from below the mouth of Union Creek contained barite, hematite, magnetite, ilmenite...LG001 Workings/exploration: Both prospecting and mining have been reported (Mertie, 1934, p. 192). Production |
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| others, 1989). The area was covered by 600 federal mining claims in 1989, and more than 5000 feet of drilling...others, 1989). The area was covered by 600 federal mining claims in 1989 and more than 5000 feet of drilling...a unit of very fine-grained chlorite-sericite-biotite schist over 1000 feet thick that includes metatuff...Placer Dome U.S. The area was covered by 600 federal mining claims in 1989 and more than 5000 feet of drilling...Placer Dome U.S. The area was covered by 600 federal mining claims in 1989 and more than 5000 feet of drilling |
