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80% of the world's coltan is from the Democratic Republic of Congo, only 1% of which is on the open market. Both men, children, and sometimes women mine for coltan. All workers earn less than $2 a day for their work. Miners are forced to mine for coltan in slave-like conditions. Many have died because of things such as mine collapses and mercury poisoning. Coltan mining fueled a civil war in the DRC. Smuggling is also a big issue. Much of the coltan on the market is illegal. Companies that deal with coltan or tantalum products are taking measures to trace the origins of the minerals, although smuggling is still going on. For example, the Rwanda army earned over $250 million from smuggling coltan. Because of the conflict behind coltan and tantalum, coltan is sometimes referred to as "Blood Coltan"