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民窿殘柱概况:某钨矿区在解放前全是民窿开采,資金薄弱,采用食富留貧的采矿方法,因此回采率很低,殘柱矿量約佔采出矿量的1/3～1/4,以現有的技术水平回采这些殘柱,可采出矿石70万吨。殘柱及采空区的情况:窿口位置上下相差30～40公尺,坑道起伏不平,寬与脈厚相等一般为0.8公尺。全部采用人工凿岩,炮眼淺而小,炸藥分佈較均勻,爆破采用威力小的黑藥放炮,所以采空区及兩盤圍岩移动不大。殘柱品位不一,平均可达0.8
Minhang residual column Overview: A tungsten mining area before the liberation of all the hole for mining, funding is weak, the use of food rich and poor mining methods, so the recovery rate is very low, residual column ore mining accounts for about 1/3 of the volume. ~ 1/4, with the existing level of technology recovery of these residual column, ore can be extracted 700,000 tons. The residual column and the goaf situation: the location of the hole up and down a difference of 30 to 40 meters, undulating trench, width and pulse width is generally equal to 0.8 meters. All artificial drilling, shallow and small hole, explosive distribution more uniform, the use of small black-hole blasting blasting, so the mined-out area and the surrounding rock is not moving. Residual column of different grades, an average of up to 0.8