Collaring a Shaft • Chi mo Deep Gold Overburden at Mines Limited

CIM Bulletin, 1966

J. S. Redpath President, J. S. Redpath Limited, Noronda, Que

Eighty feet of overburden, thirty feet consisting of fine, water-bearing sands, was encountered during the construction of a shaft collar for Chimo Gold Mines Limited at its Louvicourt, Quebec, property. This paper describes the excavation and construction methods used on the project. Open-cut methods, a sheet pile cofferdam, chemical grouting and special blasting methods were used during excavation. Concrete placement was hampered in the lower portion by a heavy water flow, and aided in the upper portion by an unusual method of form bracing. Plant and • pum11ing facilities are also described.
Keywords: bedrock, cofferdam, concrete, front-end loader, grout, Concrete, Construction, excavation, Operation, Projects, Sand, steel, Steels, Water, Waters