大吉山矿自六十年代以来,在细脉群区域采用了阶段矿房采矿法。采场布置有沿脉走向和垂直走向两种,矿房长度20～45米,宽度12～20米不等。用—100潜孔钻机打眼,炮孔直径100～130毫米。使用自制铵油炸药,药卷规格φ85×400毫米,每个药卷重2.5公斤,用木质炮棍推送药卷装填。用微 Since the 1960s, the Dajishan Mine has adopted the phase mine mining law in the small vein group area. Stope layout along the veins to the vertical and vertical two, 20 to 45 meters in length, width of 12 to 20 meters. Use -100 DTH drilling machine drilling, hole diameter 100 ~ 130 mm. Using homemade ammonium dynamite, the drug volume specifications φ85 × 400 mm, each weighing 2.5 kg, using a wooden gun stick to push the coil filling. With micro