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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.
John Colter was born in Staunton, Virginia, in 1774. In October 1803, Colter joined the Corps of Discovery, an expedition of the recently acquired Louisiana Purchase, led by William Clark and Meriwether Lewis. After leaving the expedition in 1806 Colter returned to his life as a mountain man.