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Big Chief Mine (Johnson pegmatite), Glendale, Keystone District, Pennington Co., South Dakota, USA
Olmsteadite
Big Chief Mine, Glendale, Keystone District, Pennington Co., South Dakota, USA
Photo: 2004 ROM
Big Chief Mine, Glendale, Keystone District, Pennington Co., South Dakota, USA
Photo: 2004 ROM
Latitude: 43°51'54"N
Longitude: 103°22'55"W
Longitude: 103°22'55"W
Mineralization is a pegmatite deposit hosted in the Big Chief granite pegmatite. Local rocks include Metagraywacke.
Workings include surface and underground openings with a length of 24.38 meters and an overall width of 18.29 meters.
On the southern dike a cut 30 feet wide and 30 feet deep exposes a 20 foot face. The northern dike is exposed by a keystone-shaped cut 60 feet wide at top and 40 feet at the bottom with an exploration drift 80 feet driven from the center of the face.
The southern dike yielded about 36% good-quality "blue" feldspar.
Mineral List
72 entries listed. 67 valid minerals. 3 type localities (valid minerals).
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References
U.S. Bureau of Mines (1955), Black Hills Mineral Atlas, South Dakota: part 2, Bureau of Mines Information Circular 7707.
Norton, James J. (1964), Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E.
Roberts W.L., and Rapp, George (1965), Mineralogy of the Black Hills, South Dakota School of Mines and Technology (SDSMT) Bulletin 18.
Bauer, Werner H. (1969), American Mineralogist: 54: 1312-1323.
Moore, Paul B. (1971), American Mineralogist: 56: 1-17.
Moore, Paul B. (1974), Jahnsite, Segelerite, and Robertsite,Three New Phosphate Species. American Mineralogist: 59: 48-59.
Moore, Paul B., Kampf, Anthony R., and Irving, Anthony J. (1974): 59: 900-905.
Ritz, Charles, Essere, Eric J., and Peacor, Donald R. (1974), American Mineralogist: 59: 896-899.
American Mineralogist (1976): 61: 5-ll.
Rocks & Minerals (1985): 60: 116.
Rocks & Minerals (2000): 75(3): 156-169.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10055681. NOTE: MRDS file # 10177934 may also apply but provides less data and different geographic coordinates.
Loomis, T. (2011), News from the Black Hills, South Dakota, Mineral News.
Anthony, Bideaux, Bladh, Nichols, Handbook of Mineralogy.
Norton, James J. (1964), Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E.
Roberts W.L., and Rapp, George (1965), Mineralogy of the Black Hills, South Dakota School of Mines and Technology (SDSMT) Bulletin 18.
Bauer, Werner H. (1969), American Mineralogist: 54: 1312-1323.
Moore, Paul B. (1971), American Mineralogist: 56: 1-17.
Moore, Paul B. (1974), Jahnsite, Segelerite, and Robertsite,Three New Phosphate Species. American Mineralogist: 59: 48-59.
Moore, Paul B., Kampf, Anthony R., and Irving, Anthony J. (1974): 59: 900-905.
Ritz, Charles, Essere, Eric J., and Peacor, Donald R. (1974), American Mineralogist: 59: 896-899.
American Mineralogist (1976): 61: 5-ll.
Rocks & Minerals (1985): 60: 116.
Rocks & Minerals (2000): 75(3): 156-169.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10055681. NOTE: MRDS file # 10177934 may also apply but provides less data and different geographic coordinates.
Loomis, T. (2011), News from the Black Hills, South Dakota, Mineral News.
Anthony, Bideaux, Bladh, Nichols, Handbook of Mineralogy.
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Updated Mineral Entry: SericiteFrom Van King, 22nd May 2013 18:57:41