McCloskey claims (Black Diamond group of claims), Iron Mine Canyon, Clints Well, Verde quadrangle, Long Valley District, Coconino Co., Arizona, USA‡Ref.: Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 125-128.
Wilson, E.D. & G.M. Butler (1930), Manganese ore deposits of Arizona, Arizona Bureau of Mines Bull. 127: 56-58.
A group of 5 unpatented manganese claims located in the western part of T.14N., R.10E., about 1½ miles west of Clints Well. Owned by George W. Grimes, L.A. Hough, and J.J. Chiles, of Pine.
Mineralization is deposits of manganese ore that occur near the surface as replacement bodies in decomposed limestone and sandstone and in breccias of the same forms. The area is 1½ miles long and a mile wide. The local limestone and sandstone are decomposed several feet below the surface and are stained in shades of yellow, red, brown, and black from iron and manganese oxides.
The manganese oxides occur in nodules and masses in the decomposed rock, replace the limestone and sandstone in varying degrees, and form the cementing substance of breccias. Nodules and masses of manganese oxides composed largely of psilomelane are scattered over the surface and are found in decomposed rock to a depth of a few feet. Some of the masses are 2 feet (60 cm) diameter and weigh hundreds of pounds. The psilomelane has a peculiar structure. Most specimens collected are vesicular and ropy in appearance, but when broken open are found to be composed of columnar rods 1 or 2 inches (2.5 to 5 cm) long deposited in concentric crusts. Brown iron oxide has been deposited in the interstices of this ore.
Below the bunches and masses of the purer psilomelane ore found near the surface are masses of manganese and iron oxides which partly replace limestone and sandstone along the bedding planes. In some places the manganese and iron oxides are mixed, but generally the manganese oxides are in streaks and masses encased by iron oxides.
Workings include 10 or more shallow shafts and open cuts and short tunnels (1928). The deepest shaft is 25 feet (1918).
| 'Psilomelane'|| Pyrolusite|
2 entries listed. 1 valid mineral.
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Locality Updated: Forsythe Mine, Cooksville, Howard Co., Maryland, USAFrom Bill Cordua, 9th Dec 2013 04:44:50