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根据一机部矿山局、冶金部科技司《关于组织250C型牙轮钻机工业性试验小组的通知》,在首钢矿山公司党委统一领导下,由大石河矿、江西铸锻厂、洛阳矿山机械研究所、沈阳市链条厂、洛阳矿山机器厂组成的工人、干部、技术人员,三结合的钻机联合试验组,对江西铸锻厂制造的250C钻机进行工业试验。自1975年11月17日开始,到76年2月16日整整3个月中,在大石河矿70米、80米水平面钻φ215毫米
According to the notice of organizing the industrial test group of type 250C roller cone drilling rig under the guidance of a mining department of Ministry of Metallurgical Industry and Ministry of Science and Technology of the Ministry of Metallurgy, under the unified leadership of party committee of Shougang Mining Company, the company is composed of Dashihe Mine, Jiangxi Forging Plant and Luoyang Mining Machinery Research , Shenyang Chain Factory, Luoyang Mining Machinery Factory workers, cadres and technicians, combined with the three combined rig test group, Jiangxi Casting and Forging Factory 250C rig for industrial testing. From November 17, 1975 onwards, to a full three months on February 16, 76, drilling φ215 mm at a depth of 70 meters and an elevation of 80 meters at Dashihe Mine