Kyanite resources in the northwestern United States (in two sections). 1. an investigation of selected kyanite-group mineral deposits. 2. a market study for western kyanite ores.
Van Noy-RM; Petersen-NS; Gray-JJ
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A reconnaissance study of kyanite-group mineral deposits in the northwest has revealed large exploitable reserves of the mullite- forming raw materials in north-central Idaho. Potential coproducts or byproducts are garnet and muscovite mica. The Woodrat Mountain District contains garnet-kyanite-mica schist, which has been traced for 6 miles and may extend farther. Surface samples average 29 percent kyanite and contain up to 15 percent garnet. Inferred reserves are more than 3 billion short tons. The Goat Mountain District contains several kyanite-mineral zones. Samples of the richest zones average from 10 to 20 percent kyanite minerals and represent about 200 million short tons of strippable rock. Beneficiation tests indicate that the kyanite minerals and garnet can be concentrated by a combination of gravity, flotation, and electromagnetic methods. Reserves in these deposits are sufficient to satisfy any foreseeable domestic and export demand. However, the freight tariff to reach the nearest major user of kyanite (located in the Midwest) has discouraged development of western kyanite resources. However, there is some foreign market potential. If a garnet byproduct could be prepared and sold for coated abrasive products or as grinding grains, an offset possibly could be gained to a portion of the mining and milling costs for the Pacific northwest producer. Such byproduct values would offer a means of expanding the geographical market areas as well as the market potential.
IH; Report of Investigation;
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