SINGAPORE (May 6): Tantalum, tin, tungsten and gold, often grouped together in mining industry jargon as 3TG, are vitally important to the industrial economy, used in high-tech products from smartphones to jets. But these conflict minerals, as they are known, frequently follow a sketchy path from mine to factory, coming from mines whose profits flow to violent militias, criminals and even terrorists. As human rights groups step up pressure on big companies to better police the provenance of raw materials in the US$600 billion ($816.9 billion) industry, Nathan Williams says he can help.

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