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St. Patrick Mine (Saint Patrick Mine), Pajarito District (Nogales District), Pajarito Mts, Santa Cruz Co., Arizona, USA

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‡Ref.: Wilson, E.D., et al (1934), Arizona lode gold mines and gold mining, Arizona Bureau of Mines Bull. 137: 188.

Nelson, F.J., 1963, The geology of the Pena Blanca and Walker Canyon areas, Santa Cruz County, Arizona: Tucson, University of Arizona, M.S. thesis, 82 p.

Cornwall, H.R. (1973) Field Examination, St. Patrick Mine.

Keith, Stanton B. (1975) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 191, Index of Mining Properties in Santa Cruz County, Arizona: 72.

Riggs, N.R. (1985) Stratigraphy, structure, and mineralization of the Pajarito Mountains, Santa Cruz County, Arizona: Tucson, University of Arizona, M.S. thesis, 102 p., 3 sheets, scale 1:12,000.

U.S. Bureau of Mines staff (1994) U.S. Bureau of Mines Open File Report MLA XX-94: A78.

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

U.S. Bureau of Mines file data-cluster #20 - St Patrick Mine.

MRDS database Dep. ID file #10039615, MRDS ID #M050502; and, Dep. ID #10137986, MAS ID #0040230342.

Arizona Bureau of Mines file data.

A former small surface and underground Ag-Pb-Au-Cu-Zn mine located in the NE¼NE¼ sec. 3, T24S, R12E, near Ruby, on National Forest land. Produced 1900- ?, 1924-1935. Also placed in the Nogales (Ruby) District. Operated by Mr. F. M. Means and Mr. P. Clarke (1935).

Mineralization is narrow and lensing, irrgular ore bodies striking N45E and dipping 85SE. The host rock units are the Salero Formation and Pajarito Lavas (quartz latite volcanics). Ore control was steeply dipping NE shear zones. Ore occurs as scattered pockets within a NW-trending fault zone. Minor gold, copper and zinc in gouge and fracture fillings; high-grade silver pockets in oxidized pyrite gossan. Ore concentration was epithermal open space filling and minor supergene enrichment. Alteration was marcasite to galena to anglesite and cerussite; pyrite gossan. Local structures include a NW-trending fault zone. Ore is found only within the bounding fault planes; no trace of the host rock is left in the shear zone except for some quartz phenocrysts.

Workings include shallow shaft and adit operations. High grade silver mined from the surface prior to 1900. Total production would be some 100 or more tons of ore in the 1920's & 1930's averaging about 110 oz. Ag/T, 18% Pb, and minor Au & Cu.

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