有色金属矿产资源是国家极为宝贵的财富,是社会主义建设事业的重要物质基础。在矿山生产中,对开采矿石的贫化率和损失率进行正确的系统的计算,以促进降低贫化损失,争取最充分地回收矿产资源,不但是增产节约的重要方面,且对社会主义国民经 Non-ferrous metal mineral resources are extremely valuable assets of the country and an important material basis for the cause of socialism. In mine production, proper and systematic calculation of the depletion rate and loss rate of ore mined to promote the reduction of depletion losses and strive for the fullest recovery of mineral resources is not only an important aspect of increasing production and saving, through