So and So Mine (So and So Extension Mine; So & So group; So & So Extension group; Lost Mine; Lost Mine group), Pinal Peak area, Pinal Mountains District, Pinal Mts, Gila Co., Arizona, USA

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A former underground Au-Pb-Cu-Ag-Zn mine located on 10 patented claims (5 patented claims in the So & So group, and 5 patented claims in the So & So Extension to the north), in the center sec. 9, T2S, R15E, about ¾ mile SSW of Pinal Peak, and 1 mile W of Pioneer Pass on National Forest land. Claims extend into sec. 8. The operator in 1947 was W.L. Black, of Globe. Owned and operated by Mr. August Kaempf of Globe (1962).

Mineralization is a pinch and swell ore body, hosted in diabase, which strikes N40E, then turns to N85E. Veins range from 8 to 12 feet wide. The ore zone is 365.76 meters long, 3.66 meters wide, strikes NE and dips 45S. The galena is argentiferous. Associated rock units include the Schultze Granite and the Madera Diorite.

Area structures include NE-trending Early Tertiary Schultze Granite dikes. There are no detailed geologic map of this area. ADMR report describes the diabase as a dike; however, adjoining USGS map (1141-H) shows a series of NE-trending Schulze Granite dikes, which are characteristic of the Pinal Mountains District. There are large areas of Precambrian Madera Diorite in the district.

Workings include 3 tunnels at 55 feet, 250 feet, and 60 feet long. The Extension claims, ¼ mile N, have a 200 foot long adit with a 150 foot deep winze. All into the steep, south-facing slope. Workings achieved a depth of 60.96 meters.

Assay data: Ore dump sample (1963): 1 oz Ag; .36 oz Au; 13% Pb; 2.6% Zn; and 0.18% Cu.

References

Peterson, Nels P. (1963), Geology of the Pinal Ranch Quadrangle, USGS Bulletin 1141-H: Plate 1.

Keith, Stanley B. (1982) Exxon Minerals, Tucson, Arizona.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.

USGS Pinal Peak Quadrangle map.

Arizona Department of Mineral Resources So and So Mine file.

Arizona Department of Mineral Resources Lost Mine file.

MRDS database Dep. ID #10046328, MRDS ID #M241240; and Dep. ID #10161173, MAS ID #0040070628.

Mineral List

Anglesite Bornite

Calcite Chalcopyrite

Epidote Galena

Sphalerite

7 entries listed. 7 valid minerals.