‡Ref.: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 181, 296, 399; Wenrich, K.J., et al (1992), USGS Bull. 1683-D: D2; Wenrich, K.J. & Sutphin, H.B. (1989), Lithotectonic setting necessary for formation of a U-rich, solution-collapse breccia-pipe, Grand Canyon region, AZ, USGS Open-File Rept. 89-0173; Granger, H.C. & Raup, R.B. (1962), USGS Bull. 1147-A, Recon. Study of U Deps. in AZ: A18-A21; Galbraith, F.W. & Brennan (1959), Minerals of AZ: 75, 77; Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, AZ Dept. Mines & Min. Resources Open File Rept. 92-10: 11 (Table 1); Preliminary reconnaissance for uranium in Mohave County, Arizona, 1952 to 1956, US Atomic Energy Comm., RME-158: 152; USGS Heaton Knolls topo. map; AZ Dept. Min. Resources Hack's Canyon Uranium Mine file; US Atomic Energy Comm. 172-485 Mohave County Reconn. Rept.: 43; MRDS files #10027310 & 10113546.
A former underground Cu-U-Co-Pb mine located in the N½ sec. 26, T.37N., R.5E. (Heaton Knolls 15 minute topo map), in Hack Canyon, about 37 miles SW of Fredonia, northern Mohave County. Comprised of 5 claims (Hack's claim, Hack's Nos. 2, 3, 4 & 5 claims). Owned at times, or in part, by Clair Pearson, A.E. Jenson & 3 associates, Fredonia, AZ (1940 forward). Started before 1920.
Upper Hack Canyon is cut into a section of Permian sedimentary rocks from the Hermit shale to the Kaibab limestone. The copper-uranium deposit on Hack's claim crops out on a steep slope just below the contact between the cliff-forming Coconino sandstone and the underlying Hermit shale. At surface, many fractures in broken, slumped Coconino sandstone are stained with green copper minerals and minor metatorbernite. The shaft is collared in Coconino sandstone talus. Beneath this are at least 15 to 20 feet (4.7 to 6 meters) of slumped Coconino sandstone in the throat of as pipelike collapse structure. Underlying the slumped sandstone is fractured, bleached Hermit shale.
The rock within the mine is largely fine-grained, indistinctly bedded, dirty-gray, altered sandstone of the Hermit shale. Near the SW face of the first level this rock grades without any structural break into normal red, unaltered Hermit shale.
Within the mine there are several elongate, ill-defined zones of breccia consisting of fragments of both fine- and medium-grained sandstone. These zones generally dip steeply but locally follow bedding planes. As the breccia contains no cavities, it was probably cemented under considerable pressure.
The primary uranium minerals have been deposited in these brecciad zones and in some of the coarser-grained sandstones. The breccia, which is commonly light red, contains black spots that are markedly radioactive.
The mine workings consist of a 30 foot deep shaft, a 45 foot adit, 2 inclined shafts and over 200 feet of drifts and crosscuts.
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