同时世界铁矿石供给市场被巴西淡水河谷矿业公司、澳大利亚必和必拓集团、力拓集团垄断,铁矿石价格不断上升。
Simultaneously , the international iron ore supply market is monopolized by Vale of Brazil , BHP Billiton and Rio Tinto Group , and the price of iron ore keeps rising .