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铁矿床的工业类型很多,但最重要、储量最大的,则是前寒武纪沉积变质铁矿.据报道,该类型铁矿占国外铁矿石总储量的60%以上,其中相当大的一部分是富铁矿.国外对沉积变质型的富铁矿一直都很重视,近年来在找矿和开发方面进展较大.例如,目前世界上已知最大的苏联库尔斯克铁矿区,总面积12万平方公里,断续延长600多公里,已探明的铁矿石储量426亿吨(铁品位32～62%),其中富铁矿(铁品位54～62%)储量261亿吨,占全苏富铁矿储量的70%以上.克里沃罗格是苏联的另一个重要铁矿区,面积300平方公里,绵延长达100多公里,平衡表内铁矿石储量200亿吨,其中富铁矿约20亿吨.其他如美国的上湖地区,印度的比哈尔-奥里萨邦铁矿带,巴西的米纳斯-日赖斯,加拿大的拉布拉多地槽和巴芬
There are many industrial types of iron ore deposits, but the most important and the largest reserves are pre-Cambrian metamorphic iron mines, which are reported to account for over 60% of the total foreign iron ore reserves, of which considerable Part of the rich iron ore .Foreign deposits of metamorphic rich iron ore has been very seriously, in recent years, prospecting and development of large progress.For example, the world’s largest known Kursk iron ore district, the total It covers an area of 120,000 square kilometers and extends intermittently for more than 600 kilometers. It has proven reserves of 42.6 billion tons of iron ore (32-62% of iron grade), of which 26.1 billion tons are rich in iron ore (54-62% of iron grade) Accounting for more than 70% of the reserves of the entire Su-Fu iron ore.Kerry Vorogula is another important iron ore area of the Soviet Union, an area of 300 square kilometers, stretching more than 100 kilometers, balance sheet iron ore reserves of 20 billion tons, Of which about 2 billion tons of iron ore-rich.Other such as the United States Lake region, India’s Bihar - the Orissa iron ore belt, Brazil’s Minas-Riise, Canada’s Labrador trough and Baffin