The ore deposits of Utah . E. PHOTOMICROGRAPH SHOWING LONGITUDINAL SECTION F. PHOTOMICROGRAPH SHOWING CROSS SECTION OFOF CELLULAR STRUCTURE. CELLULAR STRUCTURE. Liglit areas, chalcopyrite; dark areas, clialcocite. Light areas, chalcopyrite; dark areas, chalcocitc. REPLACEMENT OF VEGETABLE MATTER BY ORES. ORE DEPOSITS. 153 and in other localities, but so far have notbeen commercially exploited. Manganese has been extracted on a com-mercial scale at only a few localities, mainlyin the Little Grande district, about 25 milessoutheast of Green River, and at several locali-ties east of this district
The ore deposits of Utah . E. PHOTOMICROGRAPH SHOWING LONGITUDINAL SECTION F. PHOTOMICROGRAPH SHOWING CROSS SECTION OFOF CELLULAR STRUCTURE. CELLULAR STRUCTURE. Liglit areas, chalcopyrite; dark areas, clialcocite. Light areas, chalcopyrite; dark areas, chalcocitc. REPLACEMENT OF VEGETABLE MATTER BY ORES. ORE DEPOSITS. 153 and in other localities, but so far have notbeen commercially exploited. Manganese has been extracted on a com-mercial scale at only a few localities, mainlyin the Little Grande district, about 25 milessoutheast of Green River, and at several locali-ties east of this district. Geologically as well as geographically copperis the most widely distributed of the metals,occurring in rock from upper Carboniferous toTertiary in age. The deposits in the UintaBasin are, so far as known to the writer, theonly occurrences in the West of deposits of thist3^pe in rocks as late as Tertiary. The only large deposits in which silver isthe important metallic constituent are thosein the Triassic rocks of the Sil
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
