64 group (Sixty-Four group), Powers Gulch, Gila County, Arizona, USAi

Regional Level Types
64 group (Sixty-Four group)	- not defined -
Powers Gulch	Gulch
Gila County	County
Arizona	State
USA	Country

‡Ref.: Peterson, N.P. (1962), Geology and ore deposits of the Globe-Miami District, Arizona, USGS PP 342: 140-141.

Peterson, Nels P. (1963), Geology of the Pinal Ranch Quadrangle, USGS Bulletin 1141-H: 14.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Rept. 92-10: 7 (Table 1).

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

U.S. Bureau of Mines Mineral Map CU 26.

MRDS database Dep. ID #10102437, MRDS ID #M001978; and Dep. ID #10112700, MAS ID #0040070622.

A group of Cu-Au-Ag claims located in the E½ sec. 26, T.1N., R.13E. (Inspiration 7.5 minute topo map). Discovered in 1898 by Carl Eder.

In the SW corner of the Inspiration quadrangle and for 1½ miles southward in the Pinal Ranch quadrangle, the schist that crops out under the dacite on the west side of Powers Gulch contains small amounts of copper carbonates and silicates. The copper minerals occur as impregnations and veinlets that range in width from microscopic to nearly an inch (2.5 cm).

The copper-bearing schist shows no evidence of hydrothermal alteration or the former presence of sulfide minerals, except in a small area just north of the common corner of the quadrangles and also along the contact with a body of the granite porphyry facies of the Schultze granite that crops out under the dacite 4,500 feet south in the Pinal RAnch quadrangle. The granite along the contact shows considerable sericitization and slight metallization by pyrite and chalcopyrite.

The copper carbonates and silicate undoubtedly were deposited by ground water.

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