Mine detail: Iron Mountain Mine

Previously called 'Iron Hill MineIron Mine'

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Location

Lat / long:

38.11807, -105.37307

Resource(M)

Primary:	Iron, Silver
Tertiary:	Copper, Molybdenum, REE
Ore:	Sphalerite, Apatite, Brochantite, Goethite, Hematite, Jarosite, Magnetite, Molybdenite, Powellite, Pyrite, Siderite, Tennantite
Gangue:	Actinolite, Barite, Calcite, Chalcedony, Chlorite, Diopside, Phlogopite, Quartz, Ankerite
Orebody form:	DIKE
Discovery year:	1879

Production

Operation type:	Surface-Underground
Production size:	Small
Development status:	Past Producer
First production started:	1880
Last production ended:	1889

Geology

Host type:	Trachyandesite,Andesite
Associated rock:	Bunker Trachyandesite
Associated type:	Trachyandesite,Andesite
Structure:	Rosita Volcanic Center, Wet Mtns, Several Small Faults, Ring Faults
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Weak Argillization, Hydrothermal Alteration With Silicification

References

MRDS	D007848
DEP	10012295
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 MAP I-1081.}{Deposit:: HILDEBRAND, F.A. AND CONKLIN, N.M., 1974, A BRECCIA DIKE CONTAINING RARE-EARTH-BEARING APATITE, MOLYBDENITE, AND MAGNETITE AT IRON HILL, CUSTER COUNTY, COLORADO: ECONOMIC GEOLOGY, V. 69, P. 508-515.}{Deposit:: KING, R.U., UNPUBLISHED DATA.}{Reserve-Resource:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.}
Reporter	Collins, Donna B. (King, Robert U.), Beach, Richard A.