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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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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


58 entries listed. 33 valid minerals. 4 (TL) - type locality of valid minerals.

Localities in this Region

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

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

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

Mineral and/or Locality  
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