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1.. IntroductionArsenic (atomic number 33) is ubiquitous and ranks 20th in natural abundance, comprising about 0.00005% of the earth's crust, 14th in the seawater, and 12th in the human body .It's concentration in most rocks ranges from 0.5 to 2.5 mg/kg, though higher concentrations are found in finer grained argillaceous sediments and phosphorites , .
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On 30th September, 1888, Rhodes obtained, through the agency of Charles D. Rudd, his business partner in early Kimberley days and in the goldfields, Rochford Maguire, an Oxford friend, and F. R. Thompson ("Matabele Thompson") as interpreter, a concession from Lobengula of the charge over all the minerals in his territory and the right to do whatsoever was necessary to win and procure them.
Copper, silver, and gold are in group 11 of the periodic table; these three metals have one s orbital electron on top of a filled d electron shell and are characterized by high ductility, and electrical and thermal conductivity.The filled d shells in these elements contribute little to interatomic interactions, which are dominated by the s electrons through metallic bonds.
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Oct 03, 2012Key Minerals The Copperbelt area (estimated to contain 55.5m tonnes of copper and 3.6m tonnes of cobalt), which runs through Katanga contains 34% of the worlds cobalt resources and 10% of the worlds copper resources, and during the 1960s and 1970s the DRC was the worlds leading producer of these metals. Copper concessions were formerly managed by Gnrale des Carriers et des Mines