Mine detail: Horseshoe Mine

Previously called 'School Section Deposit'

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Location

Lat / long:

38.3914, -105.32918

Resource(M)

Primary:	Copper, Zinc, Lead
Secondary:	Gold, Silver
Tertiary:	Iron, Uranium
Ore:	Chalcopyrite, Gahnite, Galena, Gold, Malachite, Pyrite, Silver, Uraninite
Gangue:	Actinolite, Biotite, Garnet

Production

Operation type:	Surface-Underground
Production size:	Small
Development status:	Past Producer
First production started:	1943
Last production ended:	1947

Geology

Host rock:	Migmatitic Gneiss
Host type:	Schist,Gneiss,Pegmatite
Associated type:	Granodiorite
Structure:	Northern Wet Mountains, Canon City Embayment, Thirtynine Mile Volcanic Field, Horseshoe Fault, Major Fault With Trend Ene, Cut By Small, Local Shears, Minor Folding; Webster Park Graben
Tectonic:	Central Cordillera (Southern Rocky Mountains)
Alteration processes:	Altered Biotite Gneisses; Kaolinization

References

MRDS	D009627
DEP	10087784
Reference	{Deposit:: COKER, R. J., 1982, MINERAL RESOURCES OF THE ARKANSAS CANYON PLANNING UNIT WITH SPECIAL EMPHASIS ON THE FORMER GRAPE CREEK WILDERNESS STUDY AREAS AND THE MCINTYRE HILLS WILDERNESS STUDY AREA: US BLM MINERAL REPORT, P. 15-20}{Deposit:: TAYLOR, R. B., SCOTT, G. R., WOBUS, R. A., AND EPIS, R. C., 1975, RECONNAISSANCE GEOLOGIC MAP OF THE ROYAL GORGE QUADRANGLE, FREMONT AND CUSTER COUNTIES, COLORADO: USGS MAP I-869, 1: 62,500.}{Deposit:: RAYMOND, W. H. AND SHERIDAN, D. M., 1980, DATA ON SOME STRATABOUND PRECAMBRIAN DEPOSITS CONTAINING ZINC, COPPER, LEAD, SILVER, AND GOLD IN THE ROYAL GORGE 15-MINUTE QUADRANGLE, COLORADO: USGS OFR 80-833, 8P.}{Deposit:: NELSON-MOORE, J. L., COLLINS, D. B. AND HORNBAKER, A. L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULLETIN 40, P. 151.}{Production:: COKER, 1982; NELSON-MOORE AND OTHERS, 1978.}
Reporter	Collins, Donna B.