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正如去年所报导的(采矿杂志1983年11月,P378),印度最大的硅线石难选矿物资源是印度斯坦铜公司存比哈尔邦辛格布姆地区经营的拉普索布鲁蓝晶石矿山。到目前为止,所用的块状蓝晶石产品都是采用人工洗选获得的。产出三个品级的产品:Al_2O_3的品位大于58%,15,000吨/年;Al_2O_3的品位在48—58%之间,2,500吨/年;Al_2O_3品位为40—48%,2,500吨/年。业已证明相当于这些产品品位的矿物原料储量是130,000吨左右。但是,已经知道
As reported last year (Mining Magazine, November 1983, P378), India’s largest source of sillimanite refractory mineral resources is the Lapu-Dubu Blue, which Hindustan Copper Company operates in Singhbum, Bukhara, Stone mine. So far, the kibble products used are all obtained by manual washing. Output of three grades of products: Al_2O_3 grade greater than 58%, 15,000 tons / year; grade of Al_2O_3 between 48-58%, 2,500 tons / year; Al_2O_3 grade of 40-48%, 2,500 tons / year. The reserves of mineral raw materials, which have proven equivalent to the grade of these products, are around 130,000 tons. However, already know