Venezuela emerges as new source of ‘conflict’ minerals

By Emilia Diaz-Struck and Joseph Poliszuk

Venezuelan black-market mineral likely making its way to everything from smart phones to smart bombs

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By International Consortium of Investigative Journalists

Colombia vows to clean up coltan mining

By Corbin Hiar

Five things you need to know about coltan:

By International Consortium of Investigative Journalists

Colombia’s black-market coltan tied to drug traffickers, paramilitaries

By Ignacio Gómez G.

Excerpts from this story referencing "Tantalum":

"… tantalite — and moves through the supply chain as Tantalum or niobium.“Tantalum and niobium materials are not openly traded. Purchase contracts are confid …"