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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.
Coltan in  Heavy Metal . Coltan is the colloquial African name for columbite-tantalite, a metallic ore used to produce the elements niobium and tantalum.The endoskeleton of advanced terminator machines are made using alloys derived from a half percentage of coltan to make them hardened to heat.T-600s were made of a titanium alloy endoskeleton, but were vulnerable to heat. Coltan alloys have a much higher melting point, making it a superior alloy for endoskeletons.he endoskeleton of advanced terminator machines are made using alloys derived from a half percentage of coltan to make them hardened to heat. T-600s were made of a titanium alloy endoskeleton, but were vulnerable to heat. Coltan alloys have a much higher melting point, making it a superior alloy for endoskeletons.