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U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; U.S. Borax and Chemical Corp.; Kramer Mine; Baker Mine), Kramer Borate deposit, Boron, Kramer District, Kern Co., California, USA
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Latitude: 35°2'40"N
Longitude: 117°41'40"W
 
 
The primary mineralization is borax, precipitated in a permanent shallow lake, fed from thermal (volcanic) springs rich in sodium & boron. Kernite was formed later upon deep (+1500 ft.) burial and temperatures above 53 deg. C (Christ and Garrels, 1959). The sodium borates together with claystone are hosted as a core facies within the Middle Miocene (16 mybp) Kramer beds (Barnard & Kistler, 1967) and are completely enveloped by ulexite-bearing shales (Gale, 1946). Stratigraphic and structural studies indicate the Kramer borates were deposited in a small structural, nonmarine basin, elongated in an east-west direction and limited on the south by the Western Borax fault.
[Joe Siefke 2010]

Additonal names which apply to this locality: Osborne shaft; Discovery shaft; West Baker Mine.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Analcime
Borax
Calcite
Chabazite-Na
'Clinoptilolite'
Clinoptilolite-Na
Colemanite
Gerstleyite (TL)
'Gmelinite'
Gmelinite-Na
Greigite
'Herschelite'
'Heulandite'
Heulandite-Na
Hydroboracite
Inderite
Inyoite
Kernite
Kurnakovite
Mazzite-Na (TL)
Meyerhofferite
Mordenite
Orpiment
Pararealgar
'Phillipsite'
Phillipsite-Na
Probertite (TL)
Pyrrhotite
Realgar
Rhodochrosite
Saponite
var: Ferroan Saponite
Sassolite
Searlesite
Smythite
'Stilbite'
Tincalconite
Tunellite (TL)
Ulexite
Veatchite


58 entries listed. 33 valid minerals. 4 type localities (valid minerals).

Localities in this Region

USA
  • California
    • Kern Co.
      • Kramer District
        • Boron

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References

Minerals Notes and News (1948), Inderite discovered at Boron: Mineral Notes & News Bulletin 127: 12.

Frondel, Clifford & V. Morgen (1956), Inderite and gerstleyite from the Kramer borate district, Kern County, California: American Mineralogist: 41: 839-843.

Smith, George Irving, Hy Almond, & D.L. Sawyer, Jr. (1958), Sassolite from the Kramer borate district, California: American Mineralogist: 43: 1070.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 198, 227-228, 327.

Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22: 143-153, 165-172.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 238.

External Links

ftp://ftp.consrv.ca.gov/pub/dmg/pubs/cg/1969/22_09.pdf

ftp://ftp.consrv.ca.gov/pub/dmg/pubs/cg/1969/22_10.pdf

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: October 30, 2014 13:45:16 Page generated: October 19, 2014 20:48:40
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Updated Mineral Entry: KupritFrom Uwe Kolitsch, 30th Oct 2014 13:44:19