| Location: | Saguache County, Colorado, United States, North America |
| Lat / long: | 38.2514, -106.11032 |
| dep_id: | 10012421 |
| mrds_id: | D008036 |
| Commodity type: | metallic |
| Major mineral: | Silver, Gold |
| Minor mineral: | Zinc, Lead, Copper |
| Trace mineral: | Manganese |
| Operation type: | Unknown |
| Production size: | No production occurred |
| Development status: | Occurrence |
| ore: | Bornite, Chalcopyrite, Covellite, Enargite, Galena, Pyrargyrite, Pyrite, Sphalerite, Stromeyerite, Tennantite |
| gangue: | Fluorite, Quartz, Rhodochrosite |
| work_type: | Underground |
| alteration: | Early Barren Stage Of Alteration By Fumarolic Or Acid-Hot Spring Activity Resulted In Intense Silicification, Wallrock Replacement By Jasper And Alteration Products Hematite, Diaspore, Alunite, Barite, Zunyite, Rutile, And Kaolin Minerals. Later Mineralizing Stage By Alkaline Or Neutral Solutions Deposited Ore And Gangue And Caused Micaceous Alteration (Sericite And Chlorite) And Calcite, Quartz, And Pyrite. |
| conc_proc: | Northern Part Of District Characterized By Low- To Intermediate-Temperature Hydrothermal Formation Of Quartz Veins With Relatively High Sulfide Content (Pb, Zn, Cu, Ag, And A Little Au) And Some Au-Ag Tellurides. Southern Part Characterized By Low-Temperature Hydrothermal Formation Of Quartz-Rhodochrosite-Fluorite Veins With Minor Sulfide Content But High Ag. Secondary Enrichment Was Shallow And Important In Early Production. Oxidation Of Rhodochrosite Veins In Southern Area Resulted In Formation Of Mn Ores And Moderate Ag Enrichment. |
| ore_ctrl: | See Comments |
| Reporter: | Schwochow, Stephen D. |
| hrock_unit: | Rawley Andesite;Intrusive Quartz Latite And Rhyolite |
| hrock_type: | Quartz Latite,Latite,Andesite |
| arock_unit: | Rawley Andesite;Intrusive Quartz Latite And Rhyolite |
| arock_type: | Quartz Latite,Latite,Andesite |
| Structure: | Bonanza Caldera, Sawatch Range, San Juan Volcanic Field, Rio Grande Rift |
| tectonic: | Central Cordillera (Southern Rocky Mtns.) |
| yr_lst_prd: | 1928 |
| References: |
- Deposit:: PATTON, H.B., 1916, GEOLOGY AND ORE DEPOSITS OF THE BONANZA DISTRICT, SAGUACHE COUNTY, COLORADO: COLORADO GEOLOGICAL SURVEY BULL. 9, 136 P.
- Deposit:: BURBANK, W.S., 1932, GEOLOGY AND ORE DEPOSITS OF THE BONANZA MINING DISTRICT, COLORADO: USGS PROF. PAPER 169, 166 P.
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