Mine detail: Manganese Hill Mine

Previously called 'Morgan Ranch DepositsManganeseU.S. Fluorspar Co. MineChaffee County Fluorspar Mine'

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Location

Lat / long:

38.64667, -106.08032

Resource(B)

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

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1936
Last production ended:	1950

Geology

Host rock:	Banded Gneiss;Browns Canyon Formation
Host type:	Gneiss,Claystone,Siltstone,Arkose,Tuff
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
Tectonic:	Central Cordillera (Southern Rocky Mountains)
Alteration processes:	Silicification, Fluoritization

References

MRDS	D010246
DEP	10013772
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 FLUORSPAR DEPOSITS IN COLORADO: USGS MAP MR-70, 1:500,000, TEXT}{Deposit:: ARGALL, 1949, COLO. SCH. MINES QUART., V. 44, NO. 2}{Deposit:: CONSV. DIV. COMP. DATE, 1,64}{Deposit:: USGS TOPO MAPS, ARKANSAS RIVER SURVEY, 1955, 1: 24,000, 1961}{Deposit:: DMEA RECORDS}{Deposit:: USBM MINERAL EXAM. FILE}{Deposit:: COLO BOM AN RPT 1941, 1956}{Deposit:: MINE MAP REPO # 404949}{Deposit:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.}{Reserve-Resource:: VAN ALSTINE, R. E. (1969)}
Reporter	Collins, Donna B., Conservation Division Files, Beach, Richard A.