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大湾钼矿属于斑岩型矿床，岩层极为复杂，岩性硬、脆、碎、软、松散俱全，难取心地层约占45％左右。1980年第一个钻孔（ZK1702）采用φ130～φ91mm口径的钢粒钻进，矿心采取率只有54％，以后相继完工的6个钻孔（还有一个报废），岩矿心采取率只有一个孔是一类孔，其余5个孔均是二类孔，优质孔率仅为17％。经分析研究，为解决岩矿心采取率问题，1982年改用S56绳索取心钻进，几年来共完工33个钻孔，岩矿心采取率平均在85％以上，优质孔率81.8％，比大口径提高了64.8％，台月效率提高了一倍以上，单位成本降低了36％。
The Daywan molybdenum mine belongs to the porphyry type deposit, and the rock formation is extremely complicated. The lithology is hard, brittle, broken, soft and loose, with about 45% difficulty in reckoning the strata. In 1980, the first borehole (ZK1702) was drilled with φ130 ~ φ91mm steel balls with a core mining rate of 54%. Six drilling holes (one was scrapped) were completed in succession. The rock core mining rate was only One hole is a type of hole, the remaining five holes are two types of holes, high-quality hole rate of only 17%. After analyzing and researching, in order to solve the problem of taking rate of rock and mineral core, in 1982 it switched to S56 rope coring drilling. In the past few years, a total of 33 boreholes were drilled. The rock core mining rate averaged over 85% and the high-quality porosity was 81.8% 64.8% higher than the large caliber, Taiwan and Taiwan efficiency more than doubled, and unit cost decreased by 36%.