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皮哈萨尔米矿为对付很差的岩石条件,目前,每年在预加固采场和巷道支护中安设45km左右的锚索,使贫化率从30％降至7％。
In order to deal with poor rock conditions, the Pihasalmi Mine currently holds an anchor rope of about 45km per year in pre-reinforcement stopes and tunnel supports, reducing the rate of depletion from 30% to 7%.