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Bass Mine (Bass property; Asbestos Camp), Bass Ferry vicinity, Grand Canyon region, Coconino Co., Arizona, USA

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‡Ref.: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 367; Selfridge, G.C., Jr. (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: 24-25; Diller, J.S. (1907), Mineral Resources of the United States, USGS; Noble, L.F. (1914), Shinumo quadrangle, USGS Bull. 549: 57-60; Breed, W.J. & Roat, Ed (1974), Geology of the Grand Canyon: 172; Peirce, H.W. (1990), AZ Geol. Sur. Industrial Minerals card file.

A former asbestos mine located in the vicinity of Bass Ferry and 25 miles NW of Grand Canyon station. The deposit is 450 feet from the bottom of the canyon, which is 4,500 feet deep at this location.

Mineralization is in veins along bedding planes in Precambrian Bass Limestone that has been altered adjacent to diabase sills. The thickest veins occur in limestone, 3 to 15 feet belowa diabase sill.

The Grand Canyon exposes an excellent section of the Carboniferous, Cambrian, Algonkian, and Archean rocks. The Algonkian is markedly unconformable with the overlying Cambrian as well as the underlying Archean, and forms a wedge-shaped mass with its edge along the canyon near its bottom and thickening rapidly to the north. The asbestos occurs in the basal portion of the Algonkian. Fifteen feet of whitish limestone overlie beds of siliceous conglomerate and fine shaly beds. This limestone contains layers and nodules of serpentine with more or less asbestos. Above the asbestos limestone comes a heavy layer of compact diabase about 200 feet thick, and above the diabase is a bed of limestone and shaly rocks similar to those immediately below the diabase. A little asbestos is seen above the diabase.

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