Latitude: 31°21'32"N
Longitude: 110°22'59"W
‡Ref.: University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 39.
Stone, R.W. (1920), Gypsum deposits of the United States, USGS Bull. 697: 49.
Santmyers, R.M. (1929), Development of the Gypsum Industry by States, U.S. Bureau of Mines Information Circular 6173.
Wilson, 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: 24.
Coates, D.R., and Cushman, R.L. (1955) Geology and ground-water resources of the Douglas basin, with a section on Chemical quality of the ground water, by J.L. Hatchett: U.S. Geological Survey Water-Supply Paper 1354, 56 p., 5 sheets, scale 1:211,000.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 60.
Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise Co., AZ: 63 (Table 4).
Keith, Stanton B. (1969), Gypsum, in USGS & Arizona Bureau of Mines, and U.S. Bureau of Reclamation 1969, Mineral and water resources of Arizona, Arizona Bureau of Mines Bull. 180: 373-376.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 241.
MRDS database Dep. ID file #10023693, MRDS ID #I001102; and, Dep. ID #10283043, MAS ID #0040030150.
A former surface Gypsum-Talc mine located in secs. 2, 11, 12-15, T.24S., R.28E., about 5 miles East of Douglas. Owned by the Arizona Gypsum Plaster Co.
A former surface quarry producing gypsite and gypsum for plaster and blocks. Located in secs. 2, 11-15, T.24S., R.28E. Owned at times, or in part, by the Arizona Gypsum Plaster Co. and the Douglas Gypsum Block Co.
Mineralization is a gypsum bed to 6 feet thick with selenite in clay beneath. The bed is relatively a thin, horizontal lenses of gypsite and minor gypsum in Tertiary-Cenozoic clay and shale beds.
Workings are surficial. A few ten thousand tons of gypsite was produced from 1908 to 1932.
The deposits of talc are up to 60 meters long, 30 meters wide, and 30 meters deep and are found within the diabase and carbonate rocks. The deposits are derived from hydrothermal metamorphism of the dolomitic limestone and extend over several kilometers in the Ponta Grossa and Castro region. Only superficially exposed bodies are mined. The overburden is 3-4 meters deep.
The Gypsum-Gypsite overlies clay and shale.
Talc was produced at a rate of 5,000 metric tons/year (1984).
Mineral List
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