Crystal Cave deposit (National Gypsum Co. Mine), Dudleyville area, Pinal Co., Arizona, USA
Latitude: 32°53'42"N
Longitude: 110°41'21"W
A former surface gypsum mine located in sec. 23, T6S, R16E, about 2 miles SSE of Dudleyville, about 1 mile E of highway 77. Operated by the National Gypsum Co.
Mineralization is a bedded lacustrine gypsum deposit hosted in the Gila group (silt, shale). The host shale is calcareous to gypsiferous.
A zone at least 100 feet thick in this area contains thick (1-8 feet [0.3 to 2.1 meters]), massive, white to grayish white, granular to microcrystalline, flat-lying gypsum beds. The gypsum beds are separated by thin layers of calcareous and gypsiferous shale and silt.
Assay data: Better than 90% gypsum.
References
Elevatorski, E.A. (1980) Arizona Industrial Minerals: 54.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Min. Report 4, 185 pp.
Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.
USGS Saddle Mountain Quadrangle map.
MRDS database Dep. ID #10060184, MRDS ID #TC10141; and Dep. ID #10113550, MAS ID #0040210282.
Mineral List
1 entry listed. 1 valid mineral.
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