Mine detail: Cressmans Gulch Prospect

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Location: Jefferson County, Colorado, United States, North America
Lat / long: 39.7861, -105.25614
dep_id: 10013733
mrds_id: D010191
Commodity type: metallic and nonmetallic
Major mineral: Feldspar, Beryllium
Minor mineral: Niobium (Columbium), Tantalum
Trace mineral: Mica
Operation type: Unknown
Production size: Small ammount of material produced
Development status: Past Producer
ore: Beryl, Microcline, Muscovite
gangue: Albite, Apatite, Biotite, Manganotantalite, Quartz, Tourmaline
orebody_fm: TABULAR
Reporter: Schwochow, Stephen D.
hrock_unit: Idaho Springs Formation-Hornblende Gneiss Unit
hrock_type: Gneiss
arock_unit: Granitic Pegmatite
arock_type: Pegmatite
Structure: Front Range Uplift, Denver Basin, Hurricane Hill Fault System
tectonic: Central Cordillera (Southern Rocky Mtns)
References:
  • Deposit:: SHERIDAN, D.M., AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCL. GEOLOGIC MAP OF RALSTON BUTTES QUAD)
  • Deposit:: HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 86
  • Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 27.
  • Deposit:: USGS COMMODITY FILE, GR III, REEL 31, DOCK. 9937, 1945; GR III, REEL 32, DOCK. 10049, 1943; GR III, REEL 40, DOCK. 12742, 1944 (FROM ORIGINAL CRIB RECORD)
  • Production:: ORIGINAL CRIB RECORD (SEE USGS REFERENCE)
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