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Geology of the Wood and East Calhoun mines, Central City District, Gilpin County, Colorado

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Geology of the Wood and East Calhoun mines, Central City District, Gilpin County, Colorado; 1955; TEI; 175; Drake, Avery Ala

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The Wood-East Calhoun mine area is underlain by complexly folded Precambrian gneiss and pegmatite. The major fold in the area is an anticline that trends about N. 60° E. The Precambrian rocks are intruded by bostonite porphyry dikes of Tertiary age. All the rocks are cut by east- to northeast - trending faults that have been filled by precious metal-sulfide veins which have been worked chiefly for gold. The Wood vein occurs in an east-trending fault; the Calhoun vein occurs in a northeast-trending fault. Much of the uranium production of the Central City district has come from the Wood vein on Quartz Hill. The veins consist chiefly of quartz; pyrite is the chief metallic mineral and chalcopyrite is next in abundance. Sphalerite, galena, [...]

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Type Scheme Key
local-index unknown tei175
local-pk unknown 71209
series unknown Trace Elements Investigations

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journalTrace Elements Investigations
languageEnglish

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