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Sierra Estrella deposit, Seven Mile Mountain, Sierra Estrella Mts, Gila River Indian Reservation, Pinal Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 5' 44'' North , 112° 11' 30'' West
Latitude & Longitude (decimal): 33.0955555556, -112.191666667
Other regions containing this locality:Sonoran Desert, North America

A pegmatite deposit and former surface mica-quartz mine located in secs. 6, 7 & 8, T4S, R2E, at the south end of the Seven Mile Mountain and about 1¾ miles NNE of Enid. NOTE: May be identical to one or both of the other similar entries for the Sierra Estrella. Deposit extends over secs. 7 & 8.

Mineralization is several small pegmatite bodies in schist. Intergrown K-feldspar and quartz occur with mica. The mica sheets are ruled, rumpled, or flawed. The schist strikes N30-60E and dips steeply; the pegmatites have various strikes and dips.

Workings include prospect openings of shallow pits and bulldozer trenches. Prior to 1952 there was some experimental production of mica.

Mineral List

2 valid minerals.

The above list contains all mineral locality references listed on 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 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.


Wilson, E.D. (1969) Mineral Deposits of the Gila River Indian Reservation, Arizona. Arizona Bureau of Mines Bull. 179, 34 pp.

Arizona Geological Survey (1969) Bull. 280: 345.

Moore, R.T. & R.J. Varga (1976), Maps showing nonmetallic mineral deposits in the Phoenix area, Arizona: USGS Miscellaneous Investigations map I-845-J, 1:250,000.

Elevatorski, E.A. (1980) Arizona Industrial Minerals: 54.

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 #10060345, MRDS ID #TC10720; and Dep. ID #10186833, MAS ID #0040210753.

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