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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The mineral conponents include kroeberite, blucite and towanite with copper, nickel associated with gold, silver, platinum, palladium, cobalt and sulfer.

有用元素除铜、镍外，尚伴生有金、银、铂、钯、钴、硫可综合利用。

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Nickel, cobalt and palladium electrodeposits used as barrier layer between copper basis and gold deposit can effectively reduce migration of copper atom to gold upper deposit.

以镍、钴、钯镀层作为铜基体镀金的防渗铜中间层可以有效地防止铜原子扩散到金属表面。

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With all the mining areas now in rebel hands, mining companies have dashed to Zaire to get at some of the richest ores in the world gold, manganese, zinc and cobalt as well as copper.

ECONOMIST: Zaire