Extraction of cobalt was masked by sulfite ion.

钴的萃取被亚硫酸盐离子遮蔽。

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Mining of copper, cobalt, diamonds, gold, zinc and other metals, as well as petroleum extraction, once accounted for 75 percent of its GDP.

铜、钴、钻石、黄金、锌和其它资源的开采，以及石油开采，曾经占其GDP的75%。

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Extraction ratio of nickel and cobalt in the leaching process amounts to 98%.

在浸出过程中，镍和钴的浸出率达98%。

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