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Pioneer Mine (Great Republic Mine; Old Pioneer; White Metal; White Metal Mining Co. claims; Great Republic patent MS 370; Devine property; Pioneer South patent MS 374), Pioneer Mountain, Pinal Mountains District, Pinal Mts, Gila Co., Arizona, USA

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A former surface and underground Ag-Pb-Au-Cu-Zn mine, located in the NE¼NW¼ sec. 29, T2S, R15E, 1 mile SW of Pioneer Mountain, South slope of the Pinal Mountains, on private land. Produced 1875-1969. Operated by White Metal Mining Co. (1969). Additional names which apply to this proeprty: Howard shaft.

Mineralization is a vein deposit hosted in the Dripping Springs Quartzite, diabase and shale. The ore zone strikes N30E to N50E, and dips vertically to 75W. There are three major NE-striking veins, 1 to 3 meters wide; 8 to 10 feet wide in the open cuts, low grade. Ore control was fissures along and near NE-trending faults. An associated rock unit is rhyolite.

Area structures include two parallel NE-trending faults. Dripping Springs Quartzite is in fault contact with diabase to the south. The fault strikes NW. Dripping Springs Quartzite strikes E-W and dips 20°-25°S. Barnes Conglomerate is present both at the Dripping Springs-diabase contact, and at Dripping Springs-Pioneer Shale contact, which strikes NW. The Dripping Springs Quartzite is 100 meters wide at the mine. Late Cretaceous-Tertiary rhyolite outcrops 1/8 mile NE of the mine, in contact with Pioneer Shale, rhyolite of this age is common in the area in both Pioneer Shale and Ruin Granite.

Workings include 700 feet of stoping on the 200 and 300 foot levels of the 450 foot deep shaft. There is also a 350 foot shaft on the Howard vein, where 750 feet of stoping is present on the 200 foot level. Open cuts are also present. Workings total 1219.2 meters in length and 137.16 meters deep. The White Metal Mining Company was the main producer in the 1920's. Clippings report that high grade ore was produced in 1884.

Mineral List



5 entries listed. 5 valid minerals.

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References

The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 65.

Arizona Mining Journal (1919) November, 1919: 48.

Weed, W.H. (1922) The Mines Handbook, Vol. XV: 434.

Rand, L.H. & Sturgis, E.B. (1931) The Mines Handbook, Vol. XVIII: 467.

USGS Geologic Quadrangle GQ-1442 (1978).

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

U.S. Bureau of Land Management Mining District Sheet 672.

Arizona Department of Mineral Resources Pioneer Mine file.

Arizona Department of Mineral Resources U file Ag 6.

USGS El Capitan Mountain Quadrangle map.

Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).

MRDS database Dep. ID #10046323, MRDS ID #M241231; and Dep. ID #10161003, MAS ID #0040070549.

 
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