Some analysts think investors also are adding froth to the copper price.

一些分析师认为，投资者也在为铜价增添泡沫。

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Ultimately it will be Chinese demand that will be the biggest influence on the copper price.

最终，中国需求将是铜价的最大影响因素。

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Supplies have more than doubled since the start of November, helping sending the copper price down about 20 percent.

自去年11月开始以来，供给超过两倍，导致了20％的铜价下跌。

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They also argue that, with the copper price falling, a renegotiation might leave the government in a worse position.

ECONOMIST: A massive mining project hits a snag

Under present copper price assumptions, Barrick reduced its production expectations and hence profitability over the life of the mine.

FORBES: Barrick Gold Can Still Sparkle Despite Higher Costs And Impairment Charges In Results

It was bad luck that the copper price slumped as Zambia's government dithered over the sale of its mines.

ECONOMIST: Zambian copper