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露天开采为采矿工作的高度集中和迅速提高企业生产能力创造了条件,这是众所周知的。仅在1977年,磷灰石联合企业使用露天开采的经济效果就达1340万卢布。所以,努力扩大露天开采是很自然的事情。如果说1959年该联合企业用露天开采的矿石占30％
It is well-known that surface mining has created the conditions for a high concentration of mining operations and the rapid increase of the productive capacity of the enterprise. In 1977, the economic impact of using open-pit mining by apatite conglomerates amounted to 13.4 million rubles. Therefore, it is natural to work hard to expand open pit mining. If the joint venture in 1959 with open-pit ore accounted for 30%