SYMPOSIA PAPER Published: 01 January 1992

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


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.

Author Information

Davidson, RR
Woodward-Clyde Consultants, Denver, Colorado
Denise, G
Woodward-Clyde Consultants, Denver, Colorado
Findlay, B
BHP-Utah Mines, Ltd., British Columbia
Robertson, RB
BHP-Utah Mines, Ltd, British Columbia
Price: $25.00
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Developed by Committee: D18
Pages: 271–288
DOI: 10.1520/STP19739S
ISBN-EB: 978-0-8031-5191-8
ISBN-13: 978-0-8031-1427-2