在国民经济中,有色金属矿石采选企业属于废料产量最多的部门。矿石中金属含量极低,产品不到采出矿石的1}5叱。所以,废石场和尾矿库堆存着大量的废石和尾矿,这要占用大量土地,花费大量的废料运输和堆存的非生产费用,在大范围内严重恶化生态环境。目前,有色冶金部门矿山企业堆存有杜 In the national economy, non-ferrous metal ore mining and dressing enterprises belong to the sector with the largest amount of scrap output. Ore in the metal content is very low, the product is less than mining ore 1} 5 叱. Therefore, a large amount of waste rock and tailings are stored in the waste rock and tailings depot, which occupy a large amount of land, spend a large amount of non-production costs of transportation and stockpiling of wastes, and seriously deteriorate the ecological environment in a wide range. At present, the non-ferrous metallurgical mining enterprises pile Du