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用一台改装的长年44型地表钻机和BW规格的铝钻杆钻成了一个1791.82米的钻孔。有人认为,这是在坑内钻成的世界上最深的长倾斜钻孔。该孔是最近由南非的波尔特钻探公司的一个钻探组在ANGLO AMERICAN自由邦的GEDULD金矿完成的。该矿位于澳兰治自由邦的WELKOM附近。这个钻孔是以水平向下20°角开孔的,并于水平向下5°角终孔。该孔于1978年开
A 1791.82-meter borehole was drilled with a modified Long Year 44 surface drill and a BW-size aluminum drill pipe. Some think it is the deepest long-dip borehole drilled in a pit. The hole was recently completed by a drilling group at the Port Drilling Company in South Africa at the GEDULD gold mine in the Free State of ANGLO AMERICAN. The mine is located near WELKOM in the Free State of Orang Asli. This hole is drilled horizontally at an angle of 20 ° downward and at an angle of 5 ° to the final hole. The hole opened in 1978