A. V. Karkhu, R. M. Skryabin, N. G. Timofeev

The article discusses an opportunity of perfecting the technology and equipment of large-diameter borehole drilling for exploration of placer deposits in conditions of permafrost to improve the efficiency of shaft sinking. For the purpose the authors propose the application of the advanced technology of borehole drilling by a new type of large-diameter drill string with interval removal of rock cuttings.

№2 (108) 2013

Key words: drilling technology and equipment, large@diameter borehole. sinking rate, RPM, exploration of placer deposits, screw, permafrost

Mining Industry Journal №2 2013, p.142

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# RUSH PCB TestingPara 2013-06-12 03:20
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