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Hance Mine (Hance property; Hance Asbestos Company Mine), Shinumo quadrangle, Grand Canyon, Grand Canyon District, Coconino Co., Arizona, USA

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‡Ref.: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 367; Selfridge, Jr., G.C. (1936), An X-ray and optical investigation of the serpentine minerals, Am.Min.: 21: 463-503; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 106; Allen, M.A. & G.M. Butler (1921), Asbestos, Univ. AZ Bull. 113: 20-24; Noble, L.F. (1914), The Shinumo quadrangle, Grand Canyon District, Arizona, USGS Bull. 549: 58-60; Breed, W.J. Roat, Ed (1974), Geology of the Grand Canyon: 172; USGS Mineral and Water Resources of Arizona (1969): 308; Phillips, K.A. (1987), Arizona Industrial Minerals, AZ Dept. of Mines & Minerals; Bur. Land Management Mining District sheet 103; Stewart, L. US Bur. Mines Info Circ. 7706: 115-118; Shride, A. in AZ Bur. Mines Bull. 180: 305.

An asbestos deposit occurrence in the bottom of the Grand Canyon and side canyons. The property extends for some 9,000 feet down river from the cableway. Owned by the Hance Asbestos Co., New York.

Mineralization is hosted in Precambrian Bass Limestone altered by diabase sills (Shea basalt). The larger veins of chrysotile lie in limestones that are beneath the diabase sill. The smaller veins above the sill are more widely distributed. The veins beneath the sill may lie anywhere from 5 to 15 feet below the limestone-diabase contact.

Workings include a cableway installed about 1,200 feet above the river.

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5 entries listed. 1 valid mineral.

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