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(一)1962年,苏联有62个矿井,1961年产200万吨的矿井12个。1959-1961年新建矿井年总产量为1,130万吨,由于一些老矿山的储量已采完而停止了生产,所以井下采矿量增长不多。1961年井下开采的矿山曾用三种采矿方法采出97.3%的铁矿石,其中小中段崩落法占47.5%;小中段平巷法占24.7%;中段崩落法占25.1%。从1959年到1961年,苏联大量增添了井下用的主要矿山设备,所以主要生产过程的机械化水平有了提高(见
(I) In 1962, there were 62 mines in the Soviet Union and 12 mines producing 2 million tons in 1961. The total annual production of newly built mines between 1959 and 1961 was 11.3 million tons, and the amount of underground mining increased only marginally due to the closure of production of some old mines. In 1961, underground mined mines used three kinds of mining methods to recover 97.3% of the iron ore, among which, small-middle caving method accounted for 47.5%; small middle caving method accounted for 24.7%; middle-section caving method accounted for 25.1%. From 1959 to 1961, the Soviet Union added a large number of major mine equipment for underground operations, so the mechanization of the main production processes had been improved (see