Shaft sinking method

Details Shaft sinking method Shaft sinking method

E - Fixed Constructions

21

D

E21D 1/00 (2006.01)

Patent

CA 2305923

A shaft sinking method comprising the steps of: drilling out a first portion of a shaft-face (18), drilling a burn cut (22,24) and drilling an extended round of a predetermined depth into said first portion of the shaft-face (18), and blasting the burn cut to create a sump occupying the first portion of the shaft face (18) , and a bench occupying a second portion of the shaft face complementary to the first portion of the shaft face (18), approximately half the predetermined depth above the sump.

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