Hack Canyon Mine, Hack Canyon, Hack Canyon Mining District, Mohave County, Arizona, USAi

Regional Level Types
Hack Canyon Mine	Mine
Hack Canyon	Canyon
Hack Canyon Mining District	Mining District
Mohave County	County
Arizona	State
USA	Country

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A former Cu-U-Co-Pb occurrence/mine located in the N½ sec. 26, T37N, R5E, G&SRM, in Hack Canyon, about 37 miles SW of Fredonia, northern Mohave County, on Bureau of Land Management administered land. The property is comprised of 5 claims. Started before 1920. Owned at times, or in part, by Clair Pearson, A.E. Jenson & 3 associates, Fredonia, Arizona (1940 forward). Owned by Simpson, et al (1975).

Mineralization is a polymetallic deposit hosted in Coconino sandstone and Hermit shale. The ore body is a pipe-like collapse structure that strikes NE and dips SE. Controls for ore emplacement include the contact between Coconino Sandstone and Hermit Shale, in elongate zones of breccia and silicified sandstone. Uraninite is mixed with chalcocite deposited in the breccia zone and in some coarse-grained sandstone. Higher percentages of U occur in the breccia zones, along the SE side of the collapse structure. Local rocks include Permian to Pennsylvanian sedimentary rocks.

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 a pipe-like collapse structure. Underlying the slumped sandstone is fractured, bleached Hermit shale. Local alteration includes bleaching and silicification of rock.

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 breccia zones and in some of the coarser-grained sandstones. The breccia, which is commonly light red, contains black spots that are markedly radioactive.

Workings include underground openings with a length of 60.96 meters and an overall depth of 13.72 meters, comprised of a 30 foot deep shaft, a 45 foot adit, 2 inclined shafts and over 200 feet of drifts and crosscuts.

Comments on the production information: 1,329 tons 0.18% U in 1950, 1952-1954, & 1964.

Reserve/resource information: 500 tons of rock on dump, measured by portable field meter to have an estimated equivalent of 0.1% U.

Analytical data results: 9 samples: 0.004 to 0.280% (of what ?).

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

28 valid minerals.

Rock Types Recorded

Rock list contains entries from the region specified including sub-localities