Mine detail: Crystal Mountain Pegmatite District

Previously called 'Storm Mountain District'

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Location

Lat / long:

40.53887, -105.43253

Resource(B)

Primary:	Mica, Beryllium, Uranium, Feldspar
Secondary:	Niobium (Columbium), Tantalum, Gemstone, Manganese
Tertiary:	Bismuth, Lithium, REE
Ore:	Beryl, Chrysoberyl, Microcline, Muscovite, Tourmaline, Uraninite
Gangue:	Albite, Amblygonite, Apatite, Bertrandite, Bismutite, Cleavelandite, Fluorite, Hematite, Limonite, Magnetite, Monazite, Purpurite, Quartz, Sericite, Sillimanite, Spodumene, Torbernite, Triphylite
Orebody form:	LENTICULAR, TABULAR, IRREGULAR
Discovery year:	1884

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer
First production started:	1884
Last production ended:	1971

Geology

Host rock:	Metasedimentary Rocks--Quartz-Mica Schist;Pegmatite
Host type:	Tonalite,Mica Schist
Associated rock:	Pegmatite;Tonalite (Quartz Diorite)
Associated type:	Tonalite,Pegmatite
Structure:	Front Range Uplift, Thompson Canyon Fault, Mt Olympus Batholith, Ne-Trending Folds
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Albite And Sericite Replacement Of Spodumene; Tourmalinization Of Schistose Wallrock; Silicification Of Tonalite Wallrock; Fe Oxidation

References

MRDS	D010383
DEP	10107992
Reference	{Deposit:: THURSTON, W.R., 1955, PEGMATITES OF THE CRYSTAL MOUNTAIN DISTRICT, LARIMER COUNTY, COLORADO: USGS BULL. 1011, 185 P., 13 PLS.}{Deposit:: HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROF. PAPER 227, P. 87-104.}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 13, 29-31.}{Deposit:: BRADDOCK, W.A., AND OTHERS, 1970, GEOLOGIC MAP OF THE DRAKE QUADRANGLE, LARIMER COUNTY, COLORADO: USGS MAP GQ-829. & &}{Deposit:: GILKEY, M.M., 1960, HYATT RANCH PEGMATITE, LARIMER COUNTY, COLO.: USBM RI-5643, 18 P. & &}{Deposit:: NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 208-211. & &}{Deposit:: STERRETT, D.B., 1923, MICA DEPOSITS OF THE UNITED STATES: USGS BULL. 740, P. 59-61. & &}{Deposit:: COLORADO DIV. MINES INSPECTORS REPTS. AND ANNUAL OPERATORS REPTS.}
Reporter	Schwochow, Stephen D.