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Contents Ill 24 17. Distribution of Ba and Pb in rocks 24 18. Map showing heavy-mineral-concentrate sample localities with simplified geology 25 19. Map showing distribution of Sn and cassiterite in heavy-mineral concentrates 26 20. Photomicrographs of cassiterite and hematite in vein in silicified rhyolite 28 21. Schematic diagram showing relationship between rhyolite tuffs and lava flows in Broken Ridge area, and possible related mineral deposits 29 Contents V

This map which shows the distribution of gold in stream sediments is a product of a geochemical survey of the Charlotte 1° x 2° quadrangle, North Carolina and South Carolina, begun in 1978 that is part of a multidisci plinary study to determine the mineral potential of the area. Correlative studies are the completion of a geologic map of the quadrangle and aeromagnetic, aeroradiation, and gravity surveys (Wilson and Daniels, 1980).The Charlotte quadrangle provides a nearly complete section across the Piedmont: its northwestern corner is in the Blue Ridge, its southeastern corner is over a basin of Triassic sedimentary rocks only a few miles from the Coastal Plain. All of the quadrangle except the southeastern corner is underlain by crystalline rocks of Precambrian and Paleozoic age metamorphosed to greenschist facies in the Slate Belt and to amphibolite facies farther west. Both premetamorphic and post metamorphic intrusive rocks are present. The rocks have been weathered to rather permeable saprolite reaching depths of 200 feet (60 meters) in the Inner Piedmont. Because of the thorough leaching, most soils are acidic.

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