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1·After all, we need oil, wood, gold, diamonds, coltan, copper.

毕竟，我们需要石油、木材、钻石、铁矿、黄铜。

2·Most stopped coming because they could no longer find buyers for their nuggets of coltan, a metal used in electronic gadgets.

大多数人停止了前进的脚步，因为他们没能找到肯为他们采掘的钶钽铁矿付钱的买家。 这种矿物被应用于电子配件上。