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San Luis Wash tungsten placers (San Luis Wash placers; Arivaca placers), San Luis Wash, San Luis Mts, Arivaca District (Las Guijas District), Las Guijas & San Luis Mts, Pima Co., Arizona, USA

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Ref.: 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: 105.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 106 (Table 4).

Heylmun, Edgar B. (1987) The San Luis Mountains, Arizona. California Mining Journal: 56(10): 71-75.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10048196, MRDS ID #M800267; and, Dep. ID #10109602, MRDS ID #M050238; and, Dep. ID #10210410, MAS ID #0040190383.

A former surface W-Au placer mine/deposit area located in the west-center of sec. 14, and sec. 15, T22S, R9E, 5½ miles SW of Arivaca. First produced 1952. Owned by L.G. Fernstrom; operated by Clarence Jarnigan. No details on size given. This placer is a short distance NE of the Easter group of claims and is probably derived from them.

Mineralization is spotty and irregular pockets of wolframite and scheelite in wash alluvial (gravel). The richest part of the wash is 3,500 feet in length and up to 22 feet in width with depth ranging from a few inches (4-5 cm) to three feet (1 meter).

Worked by dry washers. A few tens of pounds of WO3 concentrates were produced in the mid-1950's. In 1952 up to 60 tons of gravel per day were mined which contained up to 0.25% tungsten concentrates. Tests of placer show as much as 3% WO3 and dry-washer concentrate assayed 20% WO3.

Mineral List

2 entries listed. 1 valid mineral.

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