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Jenifer Mine (Jennifer Mine), U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; Boron open pit; U.S. Borax and Chemical Corporation Mine; Kramer Mine; Kramer pit; Baker Mine), Kramer Borate deposit, Boron, Kramer District (Kramer Borate District), Kern Co., California, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 35° 2' 39'' North , 117° 41' 39'' West (est.)
Margin of Error:~0km
Köppen climate type:BWk : Cold desert climate

The Jenifer Mine is an old defunct underground B (Borates) workings located in sec. 23, T11N, R8W, SBM, about a mile from the main Baker Mine on the grounds of the U.S. Borax Mine. This locality was subhumed by the subsequent opening of the open pit mine.

NOTE: American Mineralogist uses the spelling "Jenifer Mine" in their published articles.

Local rocks include Quaternary alluvium and marine deposits.

Workings include underground openings.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

7 valid minerals.

This page contains all mineral locality references listed on 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 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.


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American Mineralogist (1958): 43: 169-170.
Erd, R.C., V. Morgan & J.R. Clark (1961), Tunellite, a new hydrous strontium borate from the Kramer borate district, California: USGS PP 424-C, article No. 255: C294-C297.
Troxel, Bennie Wyatt & P.K. Morton (1962), Mines and mineral resources of Kern County, California: California Division Mines & Geology County Report 1, 370 pp.: 63-64.
Clark, Joan R. (1963), Boron-oxygen polyion in the crystal structure of tunellite: Science: 141: 1178.
Clark, Joan R. (1964), The crystal structure of tunellite, SrB6O9(OH)2-3H2O: American Mineralogist: 49: 1549-1568.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 227-228, 375.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 255.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10284795.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060291051.

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