Latitude: 33°20'17"N
Longitude: 110°30'6"W
A former surface gypsum mine in secs. 9 & 16, T1S, R18E, 3 miles west of San Carlos.
Mineralization is a lacustrine gypsum deposit in late Tertiary or Pleistocene (or both) lake beds. There are 3 to 5 gypsum beds totalling 2 to 10 feet (3.05 meters) thick in 100-150 foot thick exposures of gypsum, mudstone, siltstone, and sandstone, generally striking NW and dipping 15 to 25SW; however, at the NW end on the outcrop the beds are nearly flat, or have a slight northward dip. The gypsum is generally white and granular and in the outcrops has a few seams and pockets of clay scattered through it. The deposit is covered by overburden of variable thickness. Gypsum beds may extend through a 9 acre area.
Assay data: Grade is "fair to good."
Reserves: As a rough estimate, perhaps 100,000 tons of gypsum might be recovered from the thickest beds by open-pit methods.
Workings: The Rev. F.J. Uplegger utilized a small amount many years ago to make a plaster for inscriptions. Mined on a small scale for local use.
References
Bromfield, C.S. & Shride (1956), Mineral Resources of the San Carlos Indian Reservation, Arizona, USGS Bull. 1027-N: 681.
USGS & Arizona Bureau of Mines, and U.S. Bureau of Reclamation (1969), Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180: 378.
Keith, Stanton B. (1990), Gypsum, in USGS, Arizona Bureau of Mines, and US Bureau of Reclamation (1969), Mineral and Water Resources: 378.
Elevatorski, E.A. (1978), Arizona Industrial Minerals, Arizona Department of Mineral Resources, Minerals Report No. 2: 31.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.
MRDS database Dep. ID #10060154, MRDS ID #TC10111; and Dep. ID #10136698, MAS ID #0040070601.
Mineral List
1 entry listed. 1 valid mineral.
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please
register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
Mineral and Locality Search
