After three years of successive price rises, BHP Billiton and Rio Tinto are reported to be seeking a 70% increase in contract prices this year.

在铁矿石连续三年上涨之后，BHP Billiton and Rio Tinto又在今年的合同价上要求上涨70%。

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That changed abruptly 16 during the third quarter, when several of the world's biggest copper miners including BHP Billiton and Freeport reported weak results and cut production guidance for 2017.

但在第三季度情况突然发生变化，当时包括必和必拓（BHP Billiton）和自由港在内的多个全球最大的铜矿发布了疲弱的业绩报告，并削减了2017年的产量指引。

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Australian miner BHP Billiton has reported a sharp drop in annual profits, due in part to weaker commodity prices.

BBC: BHP Billiton profits fall on lower commodity prices