![]() ![]() In 1956 Pacific Coast Borax merged with United States Potash Corporation, to become US Borax, and in 1957 changed from underground to opencast working. which since seems to have faded from the scene, although I can find no reference to its demise. ![]() In the late 1940s, the former Western Borax property was bought by the California Borate Co. Both of these operations were taken over within the next few years by Pacific Coast Borax. During 1926 & 1927, two other companies, Suckow Borax Mines and the Western Borax Co., began working further west in the deposit. Their first exploitation was underground, via the shaft known as the Baker mine, which lies near the eastern end of the Na-borate ore body. This discovery claim was later bought out by the Pacific Coast Borax Company, whose subsequent exploration drilling in the district discovered the Na-borate deposit in 1925. Suckow, following identification of colemanite nodules during well drilling in the Kramer area of Kern Co. In 1913 a borate mining claim was registered by O. A borate mine removing 10,000 tons/day during 1984. 14 & 23, T11N, R8W, SBM, N of the town of Boron. 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. 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). Kernite was formed later upon deep (+1500 ft.) burial and temperatures above 53☌ (Christ and Garrels, 1959). The primary mineralization is borax, precipitated in a permanent shallow lake, fed from thermal (volcanic) springs rich in sodium & boron.
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