| Location: | La Plata County, Colorado, United States, North America |
| Lat / long: | 37.43668, -107.94592 |
| dep_id: | 10014182 |
| mrds_id: | D010845 |
| Commodity type: | metallic |
| Major mineral: | Gold, Silver |
| Trace mineral: | Copper, Mercury, Tellurium, Antimony |
| Operation type: | Unknown |
| Deposit type: | Vein |
| Production size: | Small ammount of material produced |
| Development status: | Past Producer |
| ore: | Argentite, Bornite, Chalcopyrite, Coloradoite, Covellite, Enargite, Krennerite, Petzite, Sylvanite |
| gangue: | Ankerite, Barite, Chlorite, Dickite, Epidote, Halloysite, Limonite, Quartz, Tourmaline |
| work_type: | Underground |
| model: | 85: Polymetallic veins |
| alteration: | 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. |
| conc_proc: | Enrichment Of Native Au By Near-Surface Weathering Of Tellurides |
| ore_ctrl: | Shale-Porphyry Contact; Fault Zone Split |
| Reporter: | Schwochow, Stephen D. |
| hrock_unit: | Cutler Formation |
| hrock_type: | Diorite,Shale |
| arock_unit: | Porphyritic Rocks--Diorite-Monzonite Porphyry |
| arock_type: | Diorite |
| Structure: | San Juan Uplift, Four Corners Platform, La Plata Dome |
| tectonic: | Central Cordillera (Southern Rocky Mtns) |
| Year first produced: | 1901 |
| yr_lst_prd: | 1949 |
| disc_yr: | 1895 |
| discr: | Richard Gaines |
| References: |
- 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.
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