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Sylvia M claims, Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA

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A Mn occurrence with surface workings located on 6 unpatented claims in the NW¼ sec. 5, T3S, R29E, 12½ miles NNW of Clifton, on National Forest land. The location is approximate. Highway 191 (old highway 666) crosses the deposit near mile marker 180, 1.5 miles N of Granville Recreation area. Discovered in 1953 by N.T. Jackson and Marcos Mareno. Operators included G.S. Buttorff.

Mineralization is ore in stringers and irregular bunches hosted in Modoc Limestone and Morenci Shale. The fracture zone strikes N55-60E.
The ore zone is 3.05 meters long and 12.19 meters wide. Ore concentration was mineralization along faults and in fracture zones with some replacement of limestone. Surface oxidation exists to unknown depths. Manganiferous float is present in places along the NE-trending fault zone (extends 70 feet W of the highway). Mineralized stringers range from a fraction of an inch to several inches in width and extend several feet along the strike.

Area structures include narrow belts of Carboniferous Limestone surrounded by Tertiary volcanic flows Limesstone beds occupy the western end of a comparatively narrow belt of Carboniferous rocks that extends SE to the Oliver group of claims. Tectonic component is the transition between the basin and range province and the Colorado Plateau province.

Workings are a few shallow open cuts, exploratory work at 3.66 meters long and 2.44 meters wide.

Mineral List

2 entries listed. 1 valid mineral.

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.


Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 97.

Bennett (1975) Geology and Origin of the Breccias in the Morenci-Metcalf District, Greenlee County, Arizona, MS thesis, University of Arizona, 153 pp.

U.S. Bureau of Mines files - Sylvia M claims.

MRDS database Dep. ID #10026996, MRDS ID #M001670; and Dep. ID #10112435, MAS ID #0040110021.

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