自2007年以来,其炼钢用铁矿石开发项目的规模已经扩大了四倍。
Its project pipeline for the steelmaking ore has expanded fivefold since 2007 .
他表示,发展中国家的需求可能会推高炼钢用的铁矿石和石油价格。
He says demand in developing economies can push up prices for commodities like oil and iron ore used for making steel .