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National Mine (National Consolidated Mine; Erin Mine), Canada de la Paloma, Patagonia District, Patagonia Mts, Santa Cruz Co., Arizona, USA

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‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 310-311.

Simons, F.S. (1974) Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-762, 9 p., 1 sheet, scale 1:48,000.

Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 81 (Table 4).

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

U.S. Bureau of Mines file data-cluster #22, National Mine.

Arizona Bureau of Mines file data.

U.S. Bureau of Mines Coronado National Forest Study.

MRDS database Dep. ID file #10048327, MRDS ID #M899905; and, Dep. ID #10208124, MAS ID #0040230297.

A former small underground Cu-Ag-Pb-Au-Mo-Zn mine located in the center of sec. 23, T.23S., R.15E. (protracted), 1¾ miles SW of the O'Mara Mine, on the north bank of Canada de la Paloma, at an elevation of about 4,500 feet, and 4 miles E of the Nogales International Airport. Discovered 1899 by George Gross. Produced 1906-1915. Owned by Mr. George Gross, National Consolidated Mining Co. (1906). Operated by the National Consolidated Mining Co. (1906).

Mineralization is E-W-trending quartz-chalcopyrite-pyrite and quartz-argentiferous galena veins in brecciated Jurassic porphyritic granite along a strong fault zone. Granite intrudes Precambrian metamorphic and igneous hornblende-rich rocks. Ore concentration was supergene enrichment aong vein in the contact zone. The best copper ore was at depth. There is some oxidation and supergene enrichment. Granite porphyry is altered near the vein.

The vein dips 70ºS. and is associated with the granite porphyry contact.

The National Mine is at the N end of a series of properties comprised in a belt about 1.0 mile wide which extends southward from Paloma Canyon to Providencia Canyon for a distance of about 2.5 miles, and is referred to as the Gross belt. The Gross belt and foothills are separated from the steep slopes of the range by a piedmont-like valley along which the Piedmont Fault runs. The fault extends northward for 6 miles.

Deposits in the region are mainly Pb-Ag quartzitic veins which strike E-W at about right angles to the axis of the range. Tectonic elements include the N-S-trending Piedmont Fault and the Patagonia Range uplifted on the east.

Workings include a 200 foot vertical shaft which contains about 400 feet of drifts. Mined from 1906 through 1915, producing some 150 tons of ore averaging about 6.5% Cu, 21 oz. Ag/T, 1.1% Pb, and 0.4 oz. Au/T.

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