Mine detail: Union Pacific Shaft

Previously called 'Union Pacific Prospect'

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Location

Lat / long:

39.77027, -105.26641

Resource(M)

Primary:	Uranium, Copper
Secondary:	Zinc
Tertiary:	Bismuth, Lead, Silver
Ore:	Bornite, Chalcocite, Chalcopyrite, Pitchblende, Sphalerite, Tennantite
Gangue:	Ankerite, Calcite, Chlorite, Hematite

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	None
Development status:	Occurrence

Geology

Host rock:	Idaho Springs Formation-Hornblende Gneiss Unit
Host type:	Gneiss
Associated rock:	Granitic Pegmatite
Associated type:	Pegmatite
Structure:	Front Range Uplift, Denver Basin, Hurricane Hill Fault System
Tectonic:	Central Cordillera (Southern Rocky Mts.)
Alteration processes:	Replacement Of Fragments In The Breccia By K-Feldspar Or Ankerite

References

MRDS	D010151
DEP	10087813
Reference	{Deposit:: NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: COLORADO GEOLOGICAL SURVEY BULL. 40, P. 195}{Deposit:: SHERIDAN, DOUGLAS M. AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520.}{Deposit:: ADAMS, J.W., AND STUGARD, FREDERICK, JR., 1956, WALL-ROCK CONTROL OF CERTAIN PITCHBLENDE DEPOSITS IN GOLDEN GATE CANYON, JEFFERSON COUNTY, COLORADO: USGS BULL. 1030-G.}{Deposit:: ADAMS, J.W., AND OTHERS, 1953, URANIUM OCCURRENCES IN THE GOLDEN GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO: USGS CIRC. 320}
Reporter	Banke, Carl M., Spanski, Gregory T.