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| Ore Deposits of the Freeland-Lamartine District, Clear Creek County, Colorado GEOLOGICAL SURVEY BULLETIN...Ore Deposits of the Freeland-Lamartine District, Clear Creek County, Colorado By J. E. HARRISON and J. D...GEOLOGY AND ORE DEPOSITS OF CLEAR CREEK, GILPIN, AND LARIMER COUNTIES, COLORADO GEOLOGICAL SURVEY BULLETIN...____________________ 73 Production from the district.___________________________________ Classification...mine___________________________________________________ Brighton mine.____________________________________________ |
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| GEORGETOWN QlJADRANGLE (TOGETHER 'VITH THE EMPIRE DISTRICT) COLORADo· BY JOSIAH E. SPURR AND GEORGE H. GARREY..................._.......... . Distribution in Colorado ................................................ . . . . . . . . 99 .Both types of vein filling in the same vein zone ......... ______ .................. __ . _.............. _. 101 Relations of the vein belt to the porphyry belt ........... ______ . _...Boulder County.............. . . . . . . . . . . . ......... . ....... . 103 Ores in Gilpin County .... |
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| Geology of the Idaho Springs District Clear Creek and Gilpin Counties, Colorado GEOLOGICAL (=) I o 00...of the Idaho Springs District Clear Creek and -i ;i ?i Gilpin Counties, Colorado By ROBERT H. MOENCH and...____ Mines and prospects in the Idaho Springs district ________________ Previous studies.___________...variance in the vein ores.__-____-_-___________-__-.___ Paragenetic sequence of primary vein minerals ____________________...__________.______________ Zonal distribution of vein types _________________________________ Areal z |
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| Prospects, Idaho Springs District Clear Creek and Gilpin Counties, Colorado Descriptions and Kapa By...Commission Introduction The Idoiho Springs mining district forms an important segment of tae Front Range...west, and southwest. The adjacent Central City district, which produced ores valued at more than $100...clearly the most important district in the mineral belt The Idaho Springs district from 1860 to 1959 produced... and zinc add value to the ores in most areas. Mining activity in the Idaho Springs and adjacent districts |
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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...hornblende gneiss ____________ _ Quartzite at Coal Creek ________________ _ Igneous rocks _____________________________...Quartz diorite and associated hornblendite_ Boulder Creek granite _________________ _ Pikes Peak granite |
