Description
Alonzo Macdonald
Commodities
PrimaryFeldspar, Mica, Beryllium, Niobium (Columbium)
SecondaryTantalum
TertiaryTitanium, Metal, Uranium, Thorium, Tin, Bismuth
Commodity typeB
Deposit
Deposit sizeS
Orebody formOVOID LENS
Ore controlFractures; Wall Rock Control, Fault/Fracture Control
Materials
Ore mineralsBeryl, Bismutite, Columbite, Microcline, Monazite
GangueApatite, Garnet, Plagioclase, Quartz, Schorlite
Other materialsMuscovite
Geology
Host rockGneiss,Granite · Biotite Gneiss
StructureThirty Nine Mile Volcanic Field, Guffey Volcanic Center, Currant Creek Fault Zone, Other Faults
Tectonic settingCentral Cordillera, Southern Rocky Mountains
Economic & production
Development statusPast Producer
First production1908
Discovery year1908
Identification
Deposit ID10013023
MRDS IDD009084
RegionNA
Data scoreB
Coordinates38.79306, -105.59586
References
HEINRICH, E.W. AND BEVER, J.E., 1957, RADIOACTIVE MINERAL OCCURRENCES IN THE GUFFEY AREA, PARK AND FREMONT COUNTIES, COLORADO: COLORADO SCHOOL MINES QUARTERLY, V.52, NO. 4, P. 23-35.HEINRICH, E.W., 1981, PRECAMBRIAN TUNGSTEN AND COPPER-ZINC SKARN. DEPOSITS OF SOUTH-CENTRAL COLORADO: CGS RESOURCE SERIES 21, 115 P.EPIS, R.C., WOBUS, R.A. AND SCOTT, G.R., 1979, GEOLOGIC MAP OF THE GUFFEY QUADRANGLE, PARK COUNTY, COLORADO: USGS MAP I-1180, 1:62,500.HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROF. PAPER 227, P. 105-107