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Five things you need to know about coltan:

By International Consortium of Investigative Journalists

March 4, 2012

Five things you need to know about this black-market mineral

Related to this story

Colombia vows to clean up coltan mining

By Corbin Hiar

March 15, 2012

About this story

By International Consortium of Investigative Journalists

March 4, 2012

Venezuela emerges as new source of ‘conflict’ minerals

By Emilia Diaz-Struck and Joseph Poliszuk

March 4, 2012

Terrorism and tobacco

By Kate Willson

June 29, 2009

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      • Without better laws, "dark money" groups will prosper in 2014 state races

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