Mine detail: Mena Mine

Previously called 'Hoffmeister Homestead ProspectBlack Judge ShaftNigger Shaft'

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Location

Lat / long:

39.85374, -105.30208

Resource(M)

Primary:	Uranium
Tertiary:	Lead, Copper, Nickel, Bismuth, Zinc, Silver, Molybdenum, Iron
Ore:	Bornite, Chalcocite, Covellite, Molybdenite, Niccolite, Pyrite, Silver, Sphalerite, Uraninite, Pitchblende
Gangue:	Ankerite, Calcite, Chlorite, Quartz
Discovery year:	1949

Production

Operation type:	Underground
Production size:	Small
Development status:	Past Producer
First production started:	1956
Last production ended:	1962

Geology

Host rock:	Idaho Springs Formation-Hornblende Gneiss Unit
Host type:	Gneiss,Amphibolite,Granite
Associated rock:	Granitic Pegmatite
Associated type:	Pegmatite
Structure:	Front Range Uplift, Denver Basin, Rogers Fault Zone
Tectonic:	Central Cordillera (Southern Rocky Mts.)
Alteration processes:	Breccia Fragments Are Highly Altered With Potassium Alteration Being Prominent

References

MRDS	D010159
MAS	80590016
DEP	10013716
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. 193}{Deposit:: SHERIDAN, DOUGLAS M. AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520, p. 87-91.}{Deposit:: ADAMS, J.W., AND OTHERS, 1953, URANIUM OCCURRENCES IN THE GOLDEN GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO: USGS CIRC. 320, P. 13, 15-16.}{Deposit:: SIMS, P.K., AND SHERIDAN, D.M., 1964, GEOLOGY OF URANIUM DEPOSITS IN THE FRONT RANGE, COLORADO: USGS BULL. 1159, P. 93-94}{Production:: SHERIDAN AND OTHERS, 1967, P. 75; COLORADO DIV. MINES ANN. OPERATORS REPTS.}
Reporter	Banke, Carl M. (Hasler, J. William), Spanski, Gregory T., Hassler, J. William, Wilson, Anna B., Minecom