Mine detail: Alexander Shaft

Previously called ''

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Location

Lat / long:

38.10807, -105.34974

Resource(M)

Primary:	Silver
Secondary:	Copper
Ore:	Covellite, Malachite
Gangue:	Barite, Calcite
Discovery year:	1882

Production

Operation type:	Underground
Production size:	None
Development status:	Prospect

Geology

Host type:	Andesite
Associated rock:	Rosita Andesite
Associated type:	Andesite
Structure:	Rosita Crater And Cauldron Complex, North-Trending Fissures Dipping About 65 Degrees East
Tectonic:	Wet Mountains
Alteration processes:	Strong Argillization

References

MRDS	D007634
DEP	10012169
Reference	{Deposit:: CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.}{Deposit:: SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAPS I-1081.}
Reporter	Collins, Donna B.