| Lat / long: | 38.11807, -105.37307 |
| 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 |
| Operation type: | Surface-Underground |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1880 |
| Last production ended: | 1889 |
| 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 |
| 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AND MAGNETITE AT IRON HILL, CUSTER COUNTY, COLORADO: ECONOMIC GEOLOGY, V. 69, P. 508-515.}{Deposit:: KING, R.U., UNPUBLISHED DATA.}{Reserve-Resource:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.} |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. |