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南非帕拉博拉铜矿已决定对其铜矿床进行深层勘探,以便转入地下开采。这项计划将包括从露天采场的30号平盘上开凿一个直径为4.8m的竖井,此竖井深573m,井底海拔标高-492m,比露天采场的设计最终深度低135m。现已鉴定了竖井掘进合同,将于今年8月末开始施工。为评价地下开采的可行性,计划从井
The Palabora Copper Mine in South Africa has decided to conduct deep exploration of its copper deposits in order to move underground. The plan will include drilling a shaft 4.8m in diameter from open pan No. 30 at a depth of 573m with an elevation of -492m at the bottom of the shaft, which is 135m below the final design of the open pit. A shaft excavation contract has now been identified and construction will start by the end of August this year. To evaluate the feasibility of underground mining, plans from wells