Silver is enriched in lead concentrate.

银富集在铅精矿中。

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For reasons that lead concentrate contains many kinds of metal ores, it is difficult to evaluate its quality grade.

由于铅精矿中含有多种金属矿，给铅精矿质量等级的评价带来很大困难。

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Processing tests on mixed copper and lead concentrate produced by a large copper mine in Yunnan Province were carried out aiming at the separation of copper and lead.

针对云南一大型矿山生产的铜铅混合精矿开展选矿试验，目的是实现铜铅分离。

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Mr. Page, the company's chief executive, said recently that focusing on competitors can lead companies to "decay" because they concentrate on incremental improvement rather than big, risky bets that can offer a bigger payout.

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