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Petrographic studies of impure coal and carbonaceous shale deposits of the Salt Lake formation of early Pliocene age from two localities in the Goose Creek district in southern Idaho show little variation in organic composition and a range of 0.0 to 0.1 percent uranium. The beds are very fine textured and consist of minutely fragmented organic material mixed with larger amounts of mineral matter, much of which is of volcanic origin. In general, samples richest in uranium contain the greatest amounts of finely divided organic matter. The uranium-bearing carbonaceous rock is associated with altered volcanic materials, and the nonuraniferous carbonaceous rock is associated with unaltered volcanic material. The studies show that no quantitative correlation is apparent between uranium content and recognized types of organic matter, although the humic matter and the yellow waxy amorphous matter of the coaly layers apparently contain most of the uranium.

Laboratory study of uranium-bearing carbonaceous shale and impure coal from Goose Creek district, Cassia County, Idaho