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Denton Mine (Thurston & Hardy Mine; Black Butte Mine; Sanders Manganese Mine; Godfrey Mine; Denton claims), Peloncillo Mts, Ash Peak District (Twin Peaks District), Greenlee Co., Arizona, USA

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A former W-Mn-Baryte mine on 6 claims a short distance north of Ash Peak. Discovered and started in 1917 and closed at the end of 1918. Owned by R.V. Thurston & Joseph Hardy.

Mineralization is comprised of deposits in a moderately dissected area near the summit of the Peloncillo Mountains at an altitude of 4,500 feet. Categorized as an epithermal manganese deposit. Ore bodies are lenses and stringers hosted in basalt.

Country rocks in the vicinity of the deposits consist of Tertiary lava flows - a gray to brownish-red vesicular basalt overlain by white to pink rhyolite which forms the capping of the small hill above the deposits. The basalt is much decomposed and contains a white mineral of secondary origin which fills the cavities and vesicles, and in the shear zones it is altered to a crumbly and clayey material from which the manganese oxides can be readily separated by washing.

The deposits are contained in 2 shear zones about 1,200 feet apart, which cut the basalt and perhaps the rhyolite also, but ore has been found in the rhyolite. The north shear zone trends N.70ºW. and dips steeply to the south and can be traced for about 1,500 feet. Cuts reveal sheared rock covers a width of 30 feet on the east end, in which 6 principal stringers of manganese oxides as much as 3 inches (7.5 cm) wide are distributed. The west end cut shows 10 feet of sheared basalt with a few seams of manganese oxides, the largest of which is 6 inches (15 cm) wide.

The south shear zone strikes N.55ºW. and dips 70ºNE at the east end. At the west end it strikes N.80ºW. and dips 70ºN. The zone is about 10 feet wide at the east end workings. Ore is in discontinuous ore lens-like veinlets which are up to 2 feet wide in places. West end ore is contained in a fairly distinct vein about 14 inches (35 cm) wide.

Workings include open cuts in the north zone; 2 shafts (30 and 84 feet deep) and open cuts through 900 foot distance (east end, south zone; and a 60 foot deep shaft and open cut (west end, south zone). Produced more than 500 tons of ore at about 40% Mn (1917- Aug 31, 1918).

Mineral List

6 entries listed. 4 valid minerals.

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Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 130-132.

Wilson, E.D. & G.M. Butler (1930), Manganese ore deposits of Arizona, Arizona Bureau of Mines Bull. 127: 62-64.

Hewett, D.F. & M. Fleischer (1960), Deposits of the manganese oxides, Economic Geology: 55: 1-55.

Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 99-101.

Lemmon, D.M., and Tweto, O.L. (1962) Tungsten in the U.S., USGS map, MR-25.

Dorr (1969): 217-221.

U.S. Bureau of Mines files - Denton claims.

Arizona Department of Mineral Resources file data - Denton Mine.

MRDS database Dep. ID #10008530, MRDS ID #D000772, and Dep. ID #10010056, MRDS ID #D003429; and Dep. ID #10027134, MRDS ID #M002203; and Dep. ID #10258681, MAS ID #0040110023.

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