Foam process for recovering underground rock fragments

Details Foam process for recovering underground rock fragments Foam process for recovering underground rock fragments

E - Fixed Constructions

21

C

262/68

E21C 25/60 (2006.01) E21B 21/14 (2006.01) E21B 43/29 (2006.01) E21B 43/34 (2006.01)

Patent

CA 1233841

ABSTRACT OF THE INVENTION The invention is an improvement in borehole mining which overcomes the conventional problem in hydraulic mining of removing rock fragments and ore from beneath the surface by utilizing a foam/air conveyance technique. This eliminates the need for a pump and overcomes the drawback of short pump life that is ordinarily encountered when pumps are engaged in pumping fluid slurries containing a high component of fragmented rock. A foaming agent, such as an organic sulfonic acid surfactant is introduced into the borehole, preferably combined in the water used to dislodge the particles thereby foaming during mining. The foam containing the entrained particles is removed to the surface by a gas, e.g., air under sufficient pressure and rate to maintain the flow from the well bore. The foam is broken at the surface by conventional methods and the mined particles recovered.

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