Mine detail: J & S Group

Previously called 'J & S No. 1J & S No. 2J & S No. 3'

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Location

Lat / long:

39.07889, -105.45169

Resource(M)

Primary:	Beryllium
Tertiary:	Tin, Molybdenum, Tungsten, Uranium, Lead, Zinc, Arsenic, Iron, Copper
Ore:	Bertrandite, Beryl, Cassiterite, Chalcopyrite, Covellite, Euclase, Galena, Molybdenite, Pyrite, Sphalerite, Uraninite, Wolframite
Gangue:	Fluorite, Muscovite, Quartz, Siderite, Topaz
Orebody form:	CUPOLAS, PODS, IRREGULAR LENSES
Discovery year:	1955

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer

Geology

Host rock:	Idaho Springs Formation
Host type:	Gneiss,Granite
Associated rock:	Redskin Granite;Silver Plume Granite
Associated type:	Granite
Structure:	Tarryall Mountains, Front Range, Puma Hills, Badger Flats, Badger Flats Fault, Minor Faults, Round Mountain Syncline, Boomer Cupola
Tectonic:	Central Cordillerd (Southern Rocky Mountains)
Alteration processes:	Greisenization

References

MRDS	D010278
DEP	10087840
Reference	{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.}{Production:: MEEVES, H.C., 1956}
Reporter	Collins, Donna B.