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說明瑞典LKAB公司的基律纳铁矿是世界上最大的地下矿山,年产量为2000～2500万吨,采用分段崩落采矿法,开采矿体长约4000米,平均宽80米,倾斜60°,矿石为磁铁矿。
It shows that Kiruna Iron Ore from LKAB in Sweden is the largest underground mine in the world with an annual output of 2 to 25 million tons. The sub-caving mining method is used to mine 4,000 m ore with an average width of 80 meters and an inclination of 60 degrees , Ore for magnetite.