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

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
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