examples of important mineral found in Witwatersrand
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Carbon Leader Gold Ore, Blyvooruitzicht Gold Mine, Carletonville Goldfield, West Witwatersrand. The Carbon Leader is a blackened, hydrocarbon-rich stromatolitic interval richly impregnated with native gold and uraninite.
Resources presently extracted from the sea or areas that were formerly in the sea range from common construction materials to high-tech metals to water itself. Chemical analyses have demonstrated that sea water contains about 3.5 percent dissolved solids, with more than sixty chemical elements identified. The limitations on extraction of the dissolved elements as well as the extraction of solid mineral resources are nearly always economic, but may also be affected by geographic location (ownership and transport distance) and hampered by technological constraints (depth of ocean basins).