‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 157.
Numerous openings on the south side of Hughes Gulch and ascending the ridge to the south between St. Louis and Nigger Gulches.
Mineralization is the altered contact zone of silicified, sheared, and crumpled sedimentary rocks intruded by granite porphyry of Granite Mountain. The rocks are traversed by quartz and calcite seams, some of which extend across the contact into the granite porphyry. Nearly all of the openings show copper and iron sulphides.
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