Mine detail: Last Chance Mine

Previously called 'Kramer MineLower AditAdit No. 1Adit No. 2Commercial Minerals, Inc., claims'

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Location

Lat / long:

38.65194, -106.06671

Resource(B)

Primary:	Fluorine-Fluorite
Tertiary:	Manganese
Ore:	Fluorite
Gangue:	Barite, Calcite, Chalcedony, 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:	1927
Last production ended:	1949

Geology

Host rock:	Banded Gneiss
Host type:	Gneiss
Associated rock:	Gneissic Quartz Monzonite
Associated type:	Gneiss
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	D010249
DEP	10013774
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:: VAN DIVER, B.B., 1957, GEOLOGY OF THE CALUMET MINING DISTRICT, CHAFFEE COUNTY, COLORADO: UNIVERSITY OF COLORADO THESIS, P. 83.}{Deposit:: VANDERWILT, 1947, COLO. MINERAL RES. BOARD}{Deposit:: ARGALL, 1949, COLO. SCH. MINES QUART., V. 44, NO. 2}{Deposit:: CONSV. DIV. COMP. DATE, 1,64}{Deposit:: USBM MINERAL EXAM. FILE}{Deposit:: MINE MAP REPO 404956}{Deposit:: RECK, W. H., 1943, KRAMER MINES, INC.: DECO TREFOIL MAGAZINE, ENGINEERING NOTEBOOK BULL. M4-B28, MAY 1943, 12 PP.}
Reporter	Collins, Donna B., Conservation Division Files, Intermountain Field Operations Center (IFOC), Beach, Richard A.