Commodities
PrimaryMica, Beryllium, Uranium, Feldspar
SecondaryNiobium (Columbium), Tantalum, Gemstone, Manganese
TertiaryBismuth, Lithium, REE
Commodity typeB
Deposit
Deposit sizeS
Orebody formLENTICULAR, TABULAR, IRREGULAR
Ore controlDiscordant Pegmatites Localized By Simple Fractures In Schist And Joints In Tonalite; Concordant Pegmatites Localized By Foliation Trends In Schist And By Flow Structure Within Margins Of Tonalite Sills; Mica And Be In Pegmatites Localized By Zoning, As Function Of Cooling/Crystallization/Differentiation History; Be More Localized In Discordant Pegmatites In Schist Farther From Tonalite Sill Margins.
Materials
Ore mineralsBeryl, Chrysoberyl, Microcline, Muscovite, Tourmaline, Uraninite
GangueAlbite, Amblygonite, Apatite, Bertrandite, Bismutite, Cleavelandite, Fluorite, Hematite, Limonite, Magnetite, Monazite, Purpurite, Quartz, Sericite, Sillimanite, Spodumene, Torbernite, Triphylite
Geology
Host rockTonalite,Mica Schist · Metasedimentary Rocks--Quartz-Mica Schist;Pegmatite
Associated rockTonalite,Pegmatite · Pegmatite;Tonalite (Quartz Diorite)
StructureFront Range Uplift, Thompson Canyon Fault, Mt Olympus Batholith, Ne-Trending Folds
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
AlterationAlbite And Sericite Replacement Of Spodumene; Tourmalinization Of Schistose Wallrock; Silicification Of Tonalite Wallrock; Fe Oxidation
Economic & production
Development statusProducer
First production1884
Last production1971
Discovery year1884
Identification
Deposit ID10107992
MRDS IDD010383
Alternate namesStorm Mountain District
RegionNA
Data scoreB
Coordinates40.53887, -105.43253
References
THURSTON, W.R., 1955, PEGMATITES OF THE CRYSTAL MOUNTAIN DISTRICT, LARIMER COUNTY, COLORADO: USGS BULL. 1011, 185 P., 13 PLS.HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROF. PAPER 227, P. 87-104.MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 13, 29-31.BRADDOCK, W.A., AND OTHERS, 1970, GEOLOGIC MAP OF THE DRAKE QUADRANGLE, LARIMER COUNTY, COLORADO: USGS MAP GQ-829. & &GILKEY, M.M., 1960, HYATT RANCH PEGMATITE, LARIMER COUNTY, COLO.: USBM RI-5643, 18 P. & &NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 208-211. & &STERRETT, D.B., 1923, MICA DEPOSITS OF THE UNITED STATES: USGS BULL. 740, P. 59-61. & &COLORADO DIV. MINES INSPECTORS REPTS. AND ANNUAL OPERATORS REPTS.