Commodities
PrimaryMica
TertiaryBeryllium
Commodity typeB
Deposit
Deposit sizeS
Orebody formLENTICULAR, POD
Materials
Ore mineralsBeryl, Muscovite
GangueAlbite, Biotite, Quartz, Sericite, Tourmaline
Geology
Host rockSchist,Gneiss · Idaho Springs Formation---Biotite Gneiss
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Floyd Hill Fault Zone
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
First production1895
Last production1944
Discovery year1875
Identification
Deposit ID10013761
MRDS IDD010225
Alternate namesFloyd Hill Mica Mine
RegionNA
Data scoreB
Coordinates39.74916, -105.44087
References
HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 27-29SHERIDAN, D.M., AND MARSH, S.P., 1976, GEOLOGIC MAP OF THE SQUAW PASS QUADRANGLE, CLEAR CREEK, JEFFERSON, AND GILPIN COUNTIES, COLORADO: USGS MAP GQ-1337BOOS, M.F., 1954, GENESIS OF PRECAMBRIAN PEGMATITES IN THE DENVER MOUNTAIN PARKS AREA, COLORADO: GSA BULL., V. 65, P. 115-142