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Article in The Daily Telegraph

November 15, 2008

“Dotted across Goma, behind high walls and locked gates, there are hundreds of small-scale traders called comptoirs. Men in dusty overalls sit with large piles of rocks in front of them, using a trained eye to scan scan for the chunks likely to yield the best-quality product, samples of which they then grind to assess its coltan purity and how much to pay the negociant accordingly. In an office to the rear, the comptoir director sits in front of his laptop, scanning coltan and cassiterite prices on the internet site of the London Metal Exchange”.

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