Latitude: 33°26'43"N
Longitude: 110°45'42"W
A former surface and underground Mn mine. The main manganese workings of the Superior & Globe group on on these 2 claims, located in the center sec. 10, T1N, R15E, about 1¼ miles NNE of Copper Hill, and about 0.6 miles NNE of Black Peak, on private land. Discovered 1885. First produced 1917 and closed 1954. The Magnet claim originally belonged to the Superior and Globe Mining Co. along with the Copper Trust and Keno. It was explored for copper and silver without success. Magnet, along with Keno and Copper Trust sold it to Bennet and then it was sold to Sitton. Owned by Mr. F.A. Sitton (1961). Operated by the Mohave Mining and Milling Co. (1958).
Mineralization is lenticular ore bodies hosted in Apache Group and Pioneer Formation rocks. The ore zone is 822.96 meters long, 3.66 meters wide, with a depth-to-top of 0 meters and depth-to-bottom of 30.48 meters, striking N45E and dipping 65NW.
The vein fault splits so as to include a small, lenticular block of Pioneer formation between the two branches. The vein is most strongly mineralized along a short segment of the west branch, in which diabase forms the hanging wall. Along this short segment, the vein has been stoped from the surface to an unknown depth. The stopes range from 2 to 8 feet in width, with an average width of probably 3 to 4 feet. Beyond the end of the block of Pioneer formation, the vein continues northeastward in diabase for about 200 feet, becoming narrower and less clearly defined to the bottom of a small wash that cuts eastward across the outcrop. Generally the productive bodies appeared to be lenticular, ranging from 3 to 12 feet in width and from 60 to more than 200 feet in length. The Mn ore was not amenable to concentration by the flotation process due to its iron oxide content. The best ore was formed by residual concentration and downward enrichment of manganese oxides and did not entend below a depth of about 20 feet from the surface.
These veins were formed by replacement of gouge, breccia and diabase wallrock. The vein probably represents an old fault formed before the intrusion of diabase and reopened by slight displacement after the intrusion. The vein matter is completely oxidized to beyond the extent of any workings. It consists of a soft, earthy mixture of manganese oxides, limonite, clay, calcite, unreplaced diabase, and rib-like masses of vuggy quartz.
The principal workings consisted of opencuts dug along the outcrop almost the entire length of the claim and four shafts on the north side of the wash. Also shallow pits and short adits. They reached a depth of 45.72 meters.
Assay data: Mn 25.7%; Fe 10.62%; silica 11.44%; P 0.67%; moisture 1.45%.
References
Jones, Jr., E.L. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 168.
Wilson, E.D. and Butler, G.M. (1930), Arizona Bureau of Mines Bull. 127, Manganese Ore Deposits in Arizona.
Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 64.
Peterson, N.P. (1962), Geology and ore deposits of the Globe-Miami District, Arizona, USGS PP 342: 132-133.
MRDS database Dep. ID #10027352, MRDS ID #M002940; and Dep. ID #10161192, MAS ID #0040070037.
Mineral List
5 entries listed. 3 valid minerals.
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