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我队59年8月在李宗凡山地工作组试验了槽探“土中爆破”,全月槽井探共出勤399工班,完成槽探5004米3、浅井90．6米,大大提高了效率。其技术经济效果如表1:
In August of 1989, our team tested the blasting of “Tomb Explosion” in the Zongtang Mountain Working Group in August of 1989. The whole month of Tailings exploration covered a total attendance of 399 work classes, completing 5004 meters of trough exploration and 90.6 meters of shallow wells, greatly improving the efficiency. The technical and economic results are shown in Table 1: