On June 26, 2019, the Geological Exploration Association of China Mining Federation published a news in China Mining News: The drilling project in southwest Yun'nan, Institute of Mineral Resources, Chinese Academy...On June 26, 2019, the Geological Exploration Association of China Mining Federation published a news in China Mining News: The drilling project in southwest Yun'nan, Institute of Mineral Resources, Chinese Academy of Geological Sciences, undertaken by the Fourth Branch of China Coal Huasheng Hydrogeological Exploration Co., Ltd. has recently received good news, and its rope coring drilling depth has reached the designed hole depth of 2,700 m, creating the deepest record of large-diameter (drilling diameter φ 127mm, core diameter φ80mm) rope coring drilling in China.展开更多
文摘On June 26, 2019, the Geological Exploration Association of China Mining Federation published a news in China Mining News: The drilling project in southwest Yun'nan, Institute of Mineral Resources, Chinese Academy of Geological Sciences, undertaken by the Fourth Branch of China Coal Huasheng Hydrogeological Exploration Co., Ltd. has recently received good news, and its rope coring drilling depth has reached the designed hole depth of 2,700 m, creating the deepest record of large-diameter (drilling diameter φ 127mm, core diameter φ80mm) rope coring drilling in China.
