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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 mining is no longer a major industry in North America. Neither the United States nor Mexico has any coltan mining operations at all, and Canadaâs coltan mining industry has been on the decline for years. Many Canadian mining companies are turning to Africa and focusing their operations there.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.