Rudy Mine (Rudy group; Barbee Mine; Nigger Boy Mine; Nigger Boy claims), Artillery Mts, Mohave Co., Arizona, USA
Latitude: 34°20'N
Longitude: 113°39'W
‡Ref.: Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 149-151; Lasky, S.G. & B.N. Webber (1949), Manganese resources of the Artillery Mountains region, Mohave County, Arizona, USGS Bull. 961; USGS 15 minute Artillery Peak topo. map; Farnham, L.L. & L.A. Stewart (1958), Manganese deposits of western Arizona, US Bur. Mines Inf. Circ. 7843: 28(map), 44; MRDS files #10027682 & 10137783.
A group of 2 manganese claims and former surface mine located in sec. 1, T.11N., R.14W. & NW¼ sec. 6, T.12N., R.13W. Located April, 1918. Produced in 1953. Owned by S.K. Barbee.
34.34030; -113.65890.
The property lies near the mouth of a canyon, on a bench and a projecting spur below the west side of a basalt-capped mesa.
The deposits consist of a brecciated zone in basalt, 75 feet long and 25 feet wide, on the low outlying spur from the mesa, and a vein that cuts the basalt of the benchland about 1,500 feet south of the brecciated zone.
The basalt is a fine-grained brown to red vesicular rock most of whose constituent minerals are altered in part to iron oxides, chlorite, calcite and kaolinite. Small phenocrysts of undecomposed plagioclase feldspar and olivine are noted in one specimen. The most conspicuous feature of the rock is the abundance of amygdules ranging from the size of a pinhead to some an inch long., most of which are filled with coarsely crystalline brown to black calcite. On weathered surfaces the calcite has been dissolved from some of these amygdules, leaving behind thin films of manganese oxides and a greenish mineral believed to be chlorite. The dark color of the calcite is due to arborescent growths of manganese oxides, which are present even in very small fragments. The manganese oxides are believed not to have been deposited along cleavage cracks in the calcite, but to have been deposited in their present form contemporaneously with the calcite. Weathering of the dark calcite in the brecciated zones and veins has concentrated and enriched the manganese oxides in the orebodies, most of the calcium carbonate going off in solution.
In the brecciated zone the veinlets range from a fractional part of an inch to 8 inches (20 cm) in width, but they are rather too widely spaced to be profitably mined. The oxides are manganite, pyrolusite, and psilomelane. Pyrolusite is intergrown with calcite in long spindles in places. The vein strikes N.20ºW. and is nearly vertical. It was traced for 250 feet and is about 2 feet wide.
This deposit is of particular interest in that it clearly proves that the manganese veins cut the youngest basalt flows, which are regarded as of Quaternary age.
Mineral List
4 entries listed. 3 valid minerals.
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