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我队自1982年以来,在土墩-黄山矿区的复杂地层中进行绳索取芯钻进,完工钻孔42个,进尺19332米,平均台效575.40米,优质孔率92.86%.其中,1983年完工钻孔26个,
Since 1982, our team has carried out core coring drilling in complicated formations in the mound - Huangshan mining area, completing 42 boreholes with a footage of 19332 meters and an average surface efficiency of 575.40 meters with a high-quality porosity of 92.86%. Among them, 1983 Completed 26 holes,