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    Design and Construction of a Plastic Concrete Cutoff Wall for the Island Copper Mine

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    A plastic concrete slurry wall was constructed at the Island Copper Mine on Vancouver Island to prevent excessive seepage from the ocean into a large copper mine open pit during a south wall push-back which would lead to pit slope stability problems and flooding. An unusually low strength plastic concrete was chosen as a backfill to sustain relatively large deformations without cracking and to resist erosion if a crack should develop. Very difficult construction problems were successfully surmounted including excavation through a loose, pervious mine rock waste dump and embedding the toe of the wall into a very hard glacial till. Pit slope excavation has been completed through the cutoff soils without problem.


    Slurry wall, mine, open pit, slope stability, seepage, bentonite, plastic concrete, copper, glacial till, finite element analysis, clamshell

    Author Information:

    Davidson, RR
    Senior Associate, Woodward-Clyde Consultants, Denver, Colorado

    Denise, G
    Senior Staff Engineer, Woodward-Clyde Consultants, Denver, Colorado

    Findlay, B
    Mine Maintenance General Foreman, BHP-Utah Mines, Ltd., British Columbia,

    Robertson, RB
    Engineering Manager, BHP-Utah Mines, Ltd, British Columbia,

    Committee/Subcommittee: D18.20

    DOI: 10.1520/STP19739S