Commodities
PrimaryFeldspar, Mica
SecondaryBeryllium
Commodity typeB
Deposit
Deposit sizeS
WorkingsUnknown
Orebody formCRESCENTIC
Materials
Ore mineralsBeryl, Feldspar, Muscovite
GangueQuartz
Geology
Host rockDiorite,Granite
Associated rockDiorite,Granite · Granodiorite
StructureSouthern Mosquito Range, Thirtynine Mile Volcanic Field, Arkansas Valley Graben, E-W-Trending Faults
Tectonic settingCentral Cordillera (Southern Rocky Mountains)
Economic & production
Development statusPast Producer
Discovery year1944
Identification
Deposit ID10087809
MRDS IDD010140
Alternate namesLast Chance Spar-Mica Dyke Prospect, Last Chance Prospect
RegionNA
Data scoreB
Coordinates38.63056, -105.96337
References
HANLEY, J.B., HEINRICH, E.W., PAGE, L.R., 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROFESSIONAL PAPER 227, P. 23-27SCOTT, G.R., TAYLOR, R.B., EPIS, R.C. AND WOBUS, R.A., 1978, GEOLOGIC MAP OF THE PUEBLO 1 DEG X 2 DEG QUADRANGLE, SOUTH-CENTRAL COLORADO: USGS MAP I-1022, 1:250,000BOARDMAN, S.J., 1976, GEOLOGY OF THE PRECAMBRIAN METAMORPHIC ROCKS OF THE SALIDA AREA, CHAFFEE COUNTY, COLORADO: THE MOUNTAIN GEOLOGIST, V. 13, NO. 3, P. 89-100.BOARDMAN, S.J., 1971, PRECAMBRIAN GEOLOGY AND MINERAL DEPOSITS OF THE SALIDA AREA, CHAFFEE COUNTY, COLORADO: PH.D. THESIS, UNIVERSITY OF MICHIGAN, 131 P.