Bentonite Mine, Plomosa District, Plomosa Mts, Yuma Co., Arizona, USAA bentonitic clay mine group located in West-central sec. 25, T7N, R17W. Owned by Bellus.
Mineralization is bentonitic clay in alluvium. Probably an old lake bed. The quality iof this clay is unknown but probably swelling type and derived from alteration of tuffaceous sediments.
Workings include shallow surface openings. This mine reportedly produced a few hundred tons for local use as drilling muds in the 1940's.
ReferencesWilson, E.D. & G.H. Roseveare (1949), Arizona Nonmetallics, A Summary of Past Production and Present Operations, 2nd. Edition (revised), Arizona Bureau of Mines Bull. 155: 15.
USGS & Arizona Bureau of Mines, and U.S. Bureau of Reclamation (1969), Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 329.
Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 166 (Table 4).
Arizona Bureau of Mines file data.
1 entry listed.
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