| Lat / long: | 37.43668, -107.94592 |
| Primary: | Gold, Silver |
| Tertiary: | Copper, Mercury, Tellurium, Antimony |
| Ore: | Argentite, Bornite, Chalcopyrite, Coloradoite, Covellite, Enargite, Krennerite, Petzite, Sylvanite |
| Gangue: | Ankerite, Barite, Chlorite, Dickite, Epidote, Halloysite, Limonite, Quartz, Tourmaline |
| Discovery year: | 1895 |
| Operation type: | Unknown |
| Deposit type: | Vein |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1901 |
| Last production ended: | 1949 |
| Host rock: | Cutler Formation |
| Host type: | Diorite,Shale |
| Associated rock: | Porphyritic Rocks--Diorite-Monzonite Porphyry |
| Associated type: | Diorite |
| Structure: | San Juan Uplift, Four Corners Platform, La Plata Dome |
| Tectonic: | Central Cordillera (Southern Rocky Mtns) |
| Alteration processes: | Wall Rock Strongly Altered Near Dike. Shale And Porphyry Groundmass Bleached And Silicified 2 To 10 Ft From Fracture Zones. Feldspars In Porphyry And Arkose Altered To Sericite And Halloysite; Hornblende Altered To Chlorite, Epidote, And Carbonate In Partly Altered Porphyry, But In More Thoroughly Altered Rock Closer To Vein Consists Of Intergrown Tourmaline, Sericite, And Chlorite With Disseminated Pyrite. |
| MRDS | D010845 |
| DEP | 10014182 |
| Reference | {Deposit:: ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 73-76, 156-158}{Deposit:: EMMONS. W.H., 1905, THE NEGLECTED MINE AND NEAR-BY PROPERTIES, DURANGO QUADRANGLE, COLORADO: USGS BULL. 260, P. 121-127.}{Deposit:: BRECKON, L.S., 1934, REPORT ON THE COLORADO-JUNEAU MINES, INC., ORO FINO MINING DISTRICT, LA PLATA COUNTY, SOUTHWESTERN COLORADO: UNPUB. ENG. REPT., 14 P.}{Deposit:: EVANS, W.S., (NO DATE), REPORT ON THE NEGLECTED MINES, LA PLATA COUNTY: UNPUB. ENG. REPT., 5 P.}{Deposit:: COLORADO DIV. MINES INF. REPTS.}{Deposit:: BLM MINERAL SURVEYS MS 15973, 15974}{Deposit:: ORT, J.C., 1933, REPORT OF TESTS CONDUCTED ON SAMPLE OF ORE FROM COLORADO-JUNEAU MINES, INC.: UNPUB. REPT., 4 P.}{Production:: ECKEL AND OTHERS, 1949, P. 156 (AS COMPILED FROM USGS AND USBM RECORDS); BRECKON (1934); COLO. DIV. MINES ANNUAL OPERATOR REPTS.} |
| Reporter | Schwochow, Stephen D. |