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自1959年开始,在克里夫巴斯,对使用小型金刚石钻头钻进X－XI级岩石进行了试验工作。1959-1961年采用了矿物原料研究所和勘探技术研究所设计的几种小型金刚石钻头:A－5d＝59毫米和d＝76毫米。A－3d＝76毫米。d＝59毫米。
Since 1959, at Cliff Bath, experiments have been conducted on drilling X-grade rock using small diamond bits. 1959-1961 Several small diamond bits designed by the Institute of Mineral Materials and the Institute of Exploration Technology were used: A-5d = 59 mm and d = 76 mm. A-3d = 76 mm. d = 59 mm.