论文部分内容阅读
大型和特大型矿床,尽管其总数量与中、小型相比并不很多,但在大多数矿产的储量和开采方面却占主要地位(表1)。这一规律在研究各种地质—工业类型矿床的储量和开采的分布状况时表现得更为清晰。例如在资本主义和发展中国家,四种含铜黄铁矿型矿床中包含有铜的储量30％;在约数百个斑岩铜矿床中,有73个矿床的储量,约占铜储量的90％。在这种情况下,大型矿床矿石在开采中所占的比重也在快速地增长着,例如近20年来在资本主义和发展中国家铜的开采比重已由75％增长到80％。
Large and very large deposits, although not very large in total, are predominant in reserves and mining of most minerals (Table 1). This law is clearer when studying the distribution of reserves and mines in various geological-industrial types of deposits. In capitalist and developing countries, for example, the four copper-bearing pyrite-type deposits contain 30% of copper reserves. Of the hundreds of porphyry copper deposits, 73 deposits account for about 30% of the total copper reserves Of the 90%. In this case, the proportion of large ore deposits in mining is also rapidly increasing. For example, in the past two decades, the proportion of copper mining in capitalist and developing countries has increased from 75% to 80%.