Mine detail: Big Boulder Prospect

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Location: Larimer County, Colorado, United States, North America
Lat / long: 40.52109, -105.40809
dep_id: 10087851
mrds_id: D010315
Commodity type: metallic and nonmetallic
Major mineral: Mica
Minor mineral: Uranium
Trace mineral: Beryllium, Feldspar, Lithium
Operation type: Unknown
Production size: Small ammount of material produced
Development status: Past Producer
ore: Beryl, Microcline, Muscovite
gangue: Apatite, Garnet, Spodumene, Torbernite, Tourmaline
orebody_fm: LENTICULAR
work_type: Surface/Underground
Reporter: Schwochow, Stephen D.
hrock_unit: Metasedimentary Rocks-Quartz-Biotite Schist;Pegmatite
hrock_type: Schist
arock_unit: Pegmatite;Tonalite (Quartz Diorite)
arock_type: Tonalite,Pegmatite
Structure: Front Range Uplift, Thompson Canyon Fault, Mt Olympus Batholith, Ne-Trending Folds
tectonic: Central Cordillera (Southern Rocky Mtns)
Year first produced: 1936
yr_lst_prd: 1961
References:
  • 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.
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