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我矿在坑探中发现盲脈一处,盲胍顶部平巷离地表有145公尺高,中间并无任何平巷,由于通风及充填需要,必须自亩胍顶部向地表开凿高天井工作。鉴
My mine found a blind vein in pit exploration. The blind lanes at the top of blind guanidine were 145 meters high above the surface, with no lanes in the middle. Due to the need for ventilation and filling, high-pitches must be excavated from the top of the arable guanine to the surface. Kam