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Chadwick Mine (Chadwick claims; East Evening Star Mine; West Evening Star Mine; Houston Mine), Whetstone District, Whetstone Mts, Cochise Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 50' 8'' North , 110° 21' 38'' West
Latitude & Longitude (decimal): 31.8355555556, -110.360833333
Other regions containing this locality:Sonoran Desert, North America

A former small surface and underground W mine located in the SE ¼ sec. 26, T18S, R19E, about ¾ mile SW of McGrew Spring or 6 miles W of San Juan, in the eastern foot of the Whetstone Mountains, along the north side of Middle Canyon. Started before 1909 (1905 ?). Owned at times, or in part, by the Euclid Mining Co. (prior to 1909); Conlig Tungsten Co., Standard Tungsten Corp.; The Dewey Chadwick & Associates (1939); and, the Minerals Development Co.

Mineralization is sparse wolframite and scheelite in irregular quartz veins in medium-grained, white, muscovite granite of Precambrian age that forms a ridge and is intruding Precambrian Pinal Schist. A vein of crystalline grayish-white quartz outcrops on the South slope of this ridge for a length of 600 feet (195 meters). It is 6 inches (15 cm) to 2 feet (0.6 meters) wide and strikes N.60ºE. & dips 80ºNW. Adjacent granite shows intense sericitic alteration and contains thin particles of wolframite to ¼ inch long. Sparse, thin veinlets and tiny particles of scheelite are locally present.

Workings include surface and underground comprised of several shallow pits and trenches and short adits.

Some tungsten concentrates were produced in 1943-1944.

Mineral List

6 valid minerals.

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Hess, F.L. (1909) Note on a wolframite deposit in the Whetstone Mountains, Arizona, in Contributions to economic geology, 1908; pt. I, metals and nonmetals except fuels: U.S. Geological Survey Bulletin 380, p. 164-165.

Wilson, E.D. (1941), Tungsten Deposits of Arizona, Geological Series No. 14, Arizona Bureau of Mines Bulletin 148: 45-46.

Wilson (1950) Fluorspar in Arizona, Arizona Bureau of Mines Circular 15: 2-9.

Dale, V.B., Stewart, L.A., and McKinney, W.A. (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, U.S. Bureau of Mines Report of Investigation 5650: 54-55.

Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, Arizona: 90 (Table 4).

Chatman, M.L. (1994) U.S. Bureau of Mines Open File Report Mineral Land Assessment (MLA) 2-94.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027122, MRDS ID #M002159.

Arizona Bureau of Mines files.

Lemmon, D.M., unpublished data.

U.S. Bureau of Mines file data.

Mineral and/or Locality  
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