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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.
Prices for coltan range between $50 and $200 per pound-and has undergone a series of radical location shifts since its inception. In 2006, Australia, Brazil, and Canada produced 80% of the worldâs coltan, but as mining trends and costs change, so too does the industryâs centers.oltan is mined using techniques developed for gold mining in the 1800s. The work is hard and dangerous, with workers panning for gold in large craters in stream beds, with the average worker producing less than one kilogram of coltan a day.