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Helvetia Mine (Helvetia deposit; Santa Rita Mountains deposit; Helvetica deposit), Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA

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Ref.: Galbraith, F.W. (1940) Gypsum: Arizona Bureau of Mines Circular 5, 6 p.

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, 638 pp

Elevatorski, E.A. (1978), Arizona Industrial Minerals, Arizona Department of Mineral Resources, Minerals Report No. 2: 51.

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.

USGS Sahuarita Quadrangle topo map.

MRDS database Dep. ID file #10060179, MRDS ID #TC10136; and, Dep. ID file #10161795, MAS ID #0040190249.

A Gypsum occurrence divided between two deposits located in secs. 13 & 14, T18S, R15E. The deposit in section 14 is 1/2 mile NE of the Old World Copper Mine, and the one in sec. 13 is in a gulch NE of the Heavy Weight Mine, on military reservation land.

Mineralization is a gypsum deposit hosted in the Epitaph Dolomite. There are two areas with faulted gypsum beds - 50 to 60 feet thick and 600 to 1800 feet long.

The gypsum is of a good grade but of limited extent. Difficult access and steep dip limit the exploitation possibilities.

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