| http://www.w3.org/ns/prov#value | - While the trade in coltan, the mineral found in tin used to make cellphones and other electronics, has received so much attention the U.S. Congress passed a law requiring electronic companies to verify the origin of material used, gold continues to trade with almost no oversight at all.For example, the monitoring group found that there was a difference of more than three tons of gold between the i
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