Mine detail: Colorado-American Mine

Previously called 'American ShaftTrefone Adit or TunnelMill AditKramer AditAmerican Fluorspar Co. MineColorado Fluorspar Co. MineBrowns Canyon DepositArkansas ClaimBapp (Bopp) MineBrowns Canyon or Dostal Mine'

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Location

Lat / long:

38.6325, -106.06671

Resource(B)

Primary:	Fluorine-Fluorite
Tertiary:	Manganese
Ore:	Fluorite
Gangue:	Barite, Calcite, Goethite, Hematite, Kaolinite, Manganite, Montmorillonite, Opal, Psilomelane, Pyrite, Pyrolusite, Quartz
Orebody form:	TABULAR, LENTICULAR, POD-LIKE
Discovery year:	1923

Production

Operation type:	Unknown
Production size:	Medium
Development status:	Past Producer
First production started:	1927
Last production ended:	1949

Geology

Host rock:	Banded Gneiss
Host type:	Gneiss,Rhyolite
Associated rock:	Gneissic Quartz Monzonite;Ash-Flow Tuff
Associated type:	Gneiss,Rhyolite
Structure:	Southern Mosquito Range, Arkansas Valley Graben, Folds, Faults; N-Trending Fault Bounding Arkansas Valley; At 100-Ft Level Of Mine Workings Expose Fault With Welded Tuff On One Side, Quartz Monzonite On Other Side
Tectonic:	Central Cordillera (Southern Rocky Mountains)
Alteration processes:	Silicification, Fluoritization

References

MRDS	D010253
DEP	10013776
Reference	{Deposit:: VAN ALSTINE, R. E., 1969, GEOLOGY AND MINERAL DEPOSITS OF THE PONCHA SPRINGS NE QUADRANGLE, CHAFFEE COUNTY, COLORADO: USGS PROFESSIONAL PAPER 626, 52 P.}{Deposit:: VAN ALSTINE, R. E. AND COX, D. C., 1969, FLUORSPAR MINES AND PROSPECTS, IN, GEOLOGY AND MINERAL DEPOSITS OF THE PONCHA SPRINGS NE QUADRANGLE, CHAFFEE COUNTY, COLORADO: USGS PROFESSIONAL PAPER 626, P. 38-43}{Deposit:: BRADY, B. T., 1975, MAP SHOWING FLOORSPAR DEPOSITS IN COLORADO: USGS MAP MR-70, 1:500,000, TEXT}{Deposit:: MINE MAP REPO # 404957}{Deposit:: MICROFILM DOCUMENT 2565: MINERAL DEPOSITS BRANCH IN LIBRARY}{Deposit:: CONSV. DIV. COMP. DATE, 1,64}{Deposit:: USGS TOPO MAPS ARKANSAS RIVER SURVEY, 1955, 1: 24,000;}{Deposit:: ARGALL, 1949, COLO.SCH. MINES QUART., V. 44, NO. 2}{Deposit:: VANDERWILT, 1947, COLO. MINERAL RES. BOARD}{Deposit:: COLO BOM AN RPT 1941, 1943}{Deposit:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.}{Development:: LINTNER, R. E. COLORADO FLUORSPAR MINES, INCORPORATED, SALIDA, COLORADO. DECO TREFOIL MAGAZINE, ENGINEERING NOTE-BOOK BULL. M4-B47, NOVEMBER-DECEMBER 1947, 8 PP.}{Production:: VAN ALSTINE, R. E. (1969)}
Reporter	Collins, Donna B., Intermountain Field Operations Center (IFOC), Conservation Division Files, Beach, Richard A.