第一鉛鋅鑛对大眼爆破的推廣,由於双孔直線爆破法的成功,已進入穩步前進的階段。目前掘進率已達85％左右,火藥消耗也已接近國家指標。为使爆破效率进一步提高,爆破材料消耗不斷降低,特提出以下意見,供採探工作人員參考。一、目前使用的炮向(見第一圖)(一)掌子斷面:2.00公尺×1.8公尺 The first lead-zinc mine to promote large-scale blasting, due to the success of double-hole straight blasting, has entered a stage of steady progress. At present, the rate of excavation has reached about 85%, and the consumption of gunpowder is also close to the national target. In order to further improve the efficiency of blasting, blasting material consumption continues to decline, made the following comments, for exploration staff reference. First, the current use of the gun (see Figure 1) (a) the palm section: 2.00 meters × 1.8 meters