Mine detail: Little John Mine

Previously called 'Little John No. 1Little John No. 2'

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Location: Park County, Colorado, United States, North America
Lat / long: 39.07167, -105.42197
dep_id: 10013790
mrds_id: D010279
Commodity type: metallic
Major mineral: Beryllium
Minor mineral: Molybdenum, Tungsten, Uranium
Trace mineral: Lead, Zinc, Arsenic, Iron, Copper, Tin
Operation type: Unknown
Production size: No production occurred
Development status: Occurrence
ore: Bertrandite, Beryl, Cassiterite, Chalcopyrite, Covellite, Euclase, Galena, Molybdenite, Pyrite, Sphalerite, Uraninite, Wolframite
gangue: Fluorite, Muscovite, Quartz, Siderite, Topaz
orebody_fm: CUPOLAS, PODS, IRREGULAR LENSES
alteration: Greisenization
ore_ctrl: Greisenized Rocks; Localized By Fissures, Contacts, Favorable Rock Units
Reporter: Collins, Donna B.
hrock_type: Gneiss,Granite
arock_unit: Redskin Granite;Boulder Creek Granodiorite (Gneiss)
arock_type: Granite
Structure: Tarryall Mountains, Front Range, Puma Hills, Badger Flats, Badger Flats Fault, Minor Faults, Round Mountain Syncline
tectonic: Central Cordillera (Southern Rocky Mountains)
disc_yr: 1955
References:
  • Deposit:: HAWLEY, C.C., 1969, GEOLOGY AND BERYLLIUM DEPOSITS OF THE LAKE GEORGE (OR BADGER FLATS) BERYLLIUM AREA, PARK AND JEFFERSON COUNTIES, COLORADO: USGS PROFESSIONAL PAPER 608-A, 44 P.
  • Deposit:: MEEVES, H.C., 1966, NONPEGMATITIC BERYLLIUM OCCURRENCES IN ARIZONA, COLORADO, NEW MEXICO, UTAH, AND FOUR ADJACENT STATES: USBM REPORT OF INVESTIGATIONS 6828, P. 25-34.
  • Deposit:: HAWLEY, C.C. AND GRIFFITTS, W.R., 1968, DISTRIBUTION OF BERYLLIUM, TIN, AND TUNGSTEN IN THE LAKE GEORGE AREA, COLORADO: USGS CIRCULAR 597, 18 P.
  • Deposit:: HAWLEY, C.C. AND WOBUS, R.A., 1977, GENERAL GEOLOGY AND PETROLOGY OF THE PRECAMBRIAN CRYSTALLINE ROCKS, PARK AND JEFFERSON COUNTIES, COLORADO: USGS PROFESSIONAL PAPER 608-B, 77 P.
  • Deposit:: SIEMS, P.L., 1963, BERYLLIUM: COLORADO SCHOOL OF MINES MINERAL INDUSTRIES BULLETIN, V.6, NO. 3 15 P.
  • Deposit:: WORCESTER, P.G., 1919, MOLYBDENUM DEPOSITS OF COLORADO: CGS BULLETIN 14, P. 73-74.
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