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Standard Oil Company Mine (General Petroleum Company Mine; Filtrol Mine; Otay deposit; Otay Bentonite deposit), Otay, San Diego Co., California, USA

Latitude: 32°36'0"N
Longitude: 117°1'60"W
A former bentonite mine located in the N½ sec. 30, NW¼ sec. 29, T18S, R1W, SBM (Pemberton [1983] states it is in the SW¼ sec. 17 and the SE¼ sec. 18), 2.9 km (9,500 feet) ENE of Otay.

Mineralization is hosted in Tonalite Of La Posta Formation (sandstone, arkose, volcanic ash)

Production data are found in: Cleveland (1960).

Mineral List

'Bentonite'
Montmorillonite


2 entries listed. 1 valid mineral.

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References

Irelan, William, Jr. (1890a), Ninth annual report of the State Mineralogist: California Mining Bureau. Report 9, 352 pp.: 139.

Hertlein, Leo George & Ulysses S. Grant, IV (1944), The geology and paleontology of the marine Pliocene of San Diego, California, part I, geology: San Diego Society of Natural History Memorandum, vol. 2, 72 pp.: 57.

Kerr, Paul Francis & John Laurence Kulp (1949), Clay localities the United States: American Petroleum Institute Project 49 Preliminary Report No. 2 on clay mineral standards, Columbia Univ., 101 pp.: 51.

Cleveland, G.B. (1960), Geology of the Otay clay deposit, San Diego County, California: California Division Mines and Geology Special Report 64, 16 pp.

Weber, F.H., Jr. (1963a) Mines and mineral resources of San Diego County, California. California Division of Mines and Geology County Report 3, 309 pp.: 60-61.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 273, 440-441.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 440-441.

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the 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 hundreds 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.
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