Iron Cap Mine, Landsman Camp, Aravaipa, Aravaipa Mining District, Graham County, Arizona, USAi

Regional Level Types
Iron Cap Mine	Mine
Landsman Camp	Group of Claims
Aravaipa	Town (Former)
Aravaipa Mining District	Mining District
Graham County	County
Arizona	State
USA	Country

A former surface and underground Pb-Zn-Ag-Cu-Au-Fluorspar mine located in sec. 19, T5S, R20E, G&SRM, 2 miles (3.22 km) NE of Aravaipa, 0.5 mile (ca. 805 m) N of Landsman Camp, and near the head of Arizona Gulch, in the foothills of the Santa Teresa Mountains, at an altitude of approximately 5,000 feet (ca. 1,524 m), on private land.

Mineralization is a vein deposit hosted in the Horquilla Formation and the Pinkard Formation. Some veins occur in faults between formations. Others are wholly in limestone beds. Veinlets contain irregular lenses and pods of ore. An associated rock unit is the Copper Creek Granodiorite. Ore control was in faults and ore concentration was in broad, low-plunging anticlines. No alteration noted.

The mineralized zones occur in the lower tunnel of this mine. The most westerly zone strikes N70W, and its dip, which varies, averages about 40º to the North. The other zone strikes N85W and is vertical from the surface to 4 feet (1.22 m) below the upper tunnel, where it assumes a dip of 40º to the North. The upper tunnel vein may be a fissure that branches from the lower tunnel vein where the break-in dip occurs. Steeply dipping post-mineral faults of the north- to NW-ward strike intersect the thrust fault below the lower tunnel. The lower tunnel ore zones occur near the base of a limestone thrust block. Ores generally not oxidized. Oxidation of the ore zones within the district is probably shallowest at these workings, where it extends only a few feet below the surface.

Area structures include low-angle, reverse faults between Horquilla and Pinkard and block faulting trending NNW. Regional trends: minor Pre-Cretaceous E- and NE-trending folds and major Post-Cretaceous NNW-trending faults.

The principal workings are accessible through two entries. The upper entry, 149 feet (ca. 45 m) vertically above the lower one, is a tunnel driven west on a vein for 110 feet (ca. 34 m). Development from this drift tunnel consists of a 20-foot raise and crosscuts into both walls of the vein. The lower entry, a 630-foot crosscut, intersects a vein 430 feet (ca. 131 m) SW of its portal. A drift extends westerly for 200 feet (ca. 61 m) from this intersection. From the drift, some stoping has been done and a winze 20 feet (ca. 6 m) deep has been sunk. A raise from the top of the stope connects with the upper workings. Another drift from a point in the crosscut 75 feet (ca. 23 m) SW of the vein intersection extends 56 feet (ca. 17 m) SE-ward. Also, a large glory hole in the limestone formation.

Production not given. The assay showed 1-19% Pb, 1-35% Zn, less than 1.7 ounce (ca. 64 g)/ton Ag, and a trace of Cu & Au.

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Link to USGS MRDS:	10039448

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References