E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
E21C 41/16 (2006.01) E21D 9/00 (2006.01) E21D 11/10 (2006.01) E21D 13/02 (2006.01)
Patent
CA 2243016
A method of constructing a concrete-lined horizontal gallery in an unstable subsurface, and a mining method which uses such method. The former comprises freezing a zone of unstable subsurface extending in a selected horizontal direction from an established gallery or shaft, then excavating a preliminary chamber having a non-collapsing frozen periphery from within a frozen perimeter of the zone, then completely filling said preliminary chamber with settable concrete, and, after the concrete has set, excavating a final chamber having a non-collapsing concrete periphery and gallery dimensions from within an outer perimeter of the concrete, thereby forming a non-collapsing concrete-lined extension of the established gallery. The method is especially useful in mining an ore body surrounded by unstable subsurface, such as clay.
Ridout & Maybee Llp
Uranerz Exploration And Mining Limited
LandOfFree
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