Mine detail: Big Boulder Prospect

Previously called ''

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Location

Lat / long:

40.52109, -105.40809

Resource(B)

Primary:	Mica
Secondary:	Uranium
Tertiary:	Beryllium, Feldspar, Lithium
Ore:	Beryl, Microcline, Muscovite
Gangue:	Apatite, Garnet, Spodumene, Torbernite, Tourmaline
Orebody form:	LENTICULAR

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1936
Last production ended:	1961

Geology

Host rock:	Metasedimentary Rocks-Quartz-Biotite Schist;Pegmatite
Host type:	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)

References

MRDS	D010315
DEP	10087851
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. 92-93.}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 29.}{Deposit:: COLORADO DIV. MINES ANNUAL OPERATOR REPTS.}{Deposit:: NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 208.}{Production:: HANLEY AND OTHERS, 1950; NELSON-MOORE AND OTHERS, 1978; COLORADO DIV. MINES ANN. OPERATOR REPTS.}
Reporter	Schwochow, Stephen D.