Mine detail: Beartown District

Previously called 'Bear Creek DistrictPatented Claims: Good Hope, MS 7764Wonder, MS 7764Ferris Heretofore Ptarmigan, MS 8705Little Giant, MS 9145Bonita, MS 11327Repeal, MS 11691aGold Bug, MS 11691aGold Nugget, MS 11691aGold Bug Mill Site, MS 11691bMontezuma, MS 12152Great Western, MS 12152Anaconda, MS 12152Robertson, MS 12224Scott, MS 12224I.X.L., MS 12309J.I.C., MS 12309Kankakee, MS 14205Eclipse, MS 15263El Dorado, MS 16686'

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Location

Lat / long:

37.72279, -107.50313

Resource(M)

Primary:	Gold, Silver
Secondary:	Lead, Copper
Tertiary:	Zinc, Tellurium, Antimony
Ore:	Bornite, Calaverite, Chalcocite, Chalcopyrite, Galena, Marcasite, Petzite, Sphalerite, Sylvanite, Tetrahedrite
Gangue:	Barite, Calcite, Chlorite, Hematite, Kaolinite, Limonite, Magnetite, Quartz, Siderite, Vermiculite

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	Small
Development status:	Past Producer
First production started:	1892
Last production ended:	1961

Geology

Host rock:	Uncompahgre Formation;Irving Formation
Host type:	Slate,Quartzite,Schist,Gneiss,Argillite
Associated rock:	San Juan Formation;Early Intermediate Lavas And Breccias--Near-Source Facies
Associated type:	Rhyodacite,Quartz Latite,Andesite
Structure:	San Juan Uplift, San Juan Volcanic Field, San Juan Uplift, Unnamed Faults, San Juan Caldera, Unnamed Folds
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Oxidation Of Cu And Fe Sulfides

References

MRDS	D010716
DEP	10014090
Reference	{Deposit:: STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F, P. 67-71, 89-90.}{Deposit:: PROSSER, W.C., 1911, THE BEAR CREEK SYLVANITE CAMP, COLORADO: ENG. MINING JOUR., V. 91. 712.}{Deposit:: STEVEN, T.A., AND OTHERS, 1974, GEOLOGIC MAP OF THE DURANGO QUADRANGLE, SOUTHWESTERN COLORADO: USGE MAP I-764.}{Deposit:: BARKER, FRED, 1969, PRECAMBRIAN GEOLOGY OF THE NEEDLE MOUNTAINS, SOUTHWESTERN COLORADO: USGS PROF. PAPER 644-A.}{Deposit:: CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.}{Deposit:: BLM MINERAL SURVEYS 7764, 8705, 9145, 11327, 11691A&B, 12152, 12224, 12309, 14205, 15263, 16686}{Deposit:: COLORADO DIV. MINES INF. REPTS., ANNUAL OPERATOR REPTS., INSPECTOR REPTS., MINE MANAGERS REPTS.}{Production:: STEVEN, T.A., AND OTHERS, 1969, P. 89.}
Reporter	Schwochow, Stephen D.