Method and apparatus for drilling and mining

Details Method and apparatus for drilling and mining Method and apparatus for drilling and mining

E - Fixed Constructions

21

C

255/11, 262/68

E21C 37/12 (2006.01) E21B 7/20 (2006.01) E21B 21/12 (2006.01) E21B 43/28 (2006.01) E21B 43/29 (2006.01)

Patent

CA 1129446

ABSTRACT The invention is a novel method and apparatus for subterranean drilling and mining, particularly suited to alluvial deposits. The method uses water jets from the lower end of the apparatus to loosen and remove soil. Part of the water is bled off to raise a piston and associated weight, the water being evacuated from the cylinder in which the piston operates from time to time to give periodic impulses to the outer casing. Air may be admitted to the system during the mining mode to increase its efficiency.

347739

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