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A black market for coltan â a strategically important mineral used in an array of electronic devices â has emerged in the Amazon jungles that cover the border area between Colombia, Venezuela and Brazil. In Venezuela and most of Colombia coltan mining is illegal, yet small-scale miners and buyers are plentiful.
Colt is known for the engineering, production, and marketing of firearms, most especially between the 1850s and World War I, when it was a dominating force in its industry and a seminal influence on manufacturing technology.olt's presence in the British market caused years of acrimony and lawsuits among British arms makers, who doubted the validity of Colt's British patent and the desirability of the American system of manufacturing.