In March 2005, Brazilian miner Vale secured an exploration contract and began work on feasibility studies for an iron ore mine — a complex undertaking due to environmental concerns.
2005年3月，巴西矿业公司淡水河谷获得了一份开采合同，并开始为这家铁矿石公司提供可行性报告研究，因为环境原因这项工作很复杂。
The wall rock of mining roadway in Xishimen Iron Ore Mine was seriously deformed and broken in complex forms.
西石门铁矿回采巷道围岩变形破坏严重，破坏形式复杂。
The special complex of Baiyun iron ore and some improvement measures for quality and management are explained in the paper.
本文简要阐述了白云鄂博铁矿资源的特殊复杂性，同时提出了矿石质量控制和管理技术的改进措施。
The Baotou iron ore is complex ore that contains iron, rare-earth elements, fluorine, potassium and sodium.
包头矿是一种复合矿，它含有铁、稀土和氟、钾、钠等元素。
The Baotou iron ore is complex ore that contains iron, rare-earth elements, fluorine, potassium and sodium.
包头矿是一种复合矿，它含有铁、稀土和氟、钾、钠等元素。
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