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这份资料是英国奇切斯特钻石公司寄来的,主要是回答我们在座谈时(1980年4月)提出的关于露天转地下开采的问题。该文章刊在1975年12月的《JOURNAL OF THESOUTH AFRICAN INSTITUTE OF MINING AND METALLURGY》上。该文曾在1975年5月21日举行的南非采矿、选矿学院讨论会上发表过。下面的译文只摘译了有关露天转地下开采的部份。
This information was sent by the British company Chichester Diamond Company, mainly to answer the question raised by us during the discussion (April 1980) on the open pit mining. This article appeared in the “JOURNAL OF THESOUTH AFRICAN INSTITUTE OF MINING AND METALLURGY”, December 1975. The article was published at the Seminar on Mining and Mineral Processing in South Africa on May 21, 1975. The following translation only extracts the part about the underground mining.