| Lat / long: | 37.61029, -107.77758 |
| Primary: | Silver |
| Tertiary: | Copper |
| Ore: | Pyrite |
| Gangue: | Limonite, Quartz |
| Operation type: | Unknown |
| Deposit type: | Vein |
| Production size: | Small |
| Development status: | Past Producer |
| Last production ended: | 1925 |
| Host rock: | Twilight Gneiss |
| Host type: | Gneiss |
| Structure: | San Juan Uplift, Needle Mtns Uplift |
| Tectonic: | Central Cordillera (Southern Rocky Mtns) |
| Alteration processes: | Fe Oxidation |
| MRDS | D010869 |
| DEP | 10014200 |
| Reference | {Deposit:: SCOTT, D.C., 1983, MINERAL INVESTIGATION OF THE WEST NEEDLE WILDERNESS STUDY AREA AND THE BLM WEST NEEDLE CONTIGUOUS WILDERNESS STUDY AREA, LA PLATA AND SAN JUA COUNTIES, COLORADO: USBM MLA 35-83, P. 7, 19.}{Deposit:: BARKER, FRED, 1969, PRECAMBRIAN GEOLOGY OF THE NEEDLE MOUNTAINS, SOUTHWESTERN COLORADO: USGS PROF. PAPER 644-A.}{Deposit:: CROSS, WHITMAN, AND HOLE, A.D., 1910, DESCRIPTION OF THE ENGINEER MOUNTAIN QUADRANGLE: USGS FOLIO 171.} |
| Reporter | Schwochow, Stephen D. |