Monitoring of Highwall Stability at the Dome Open Pit

CIM Edmonton 2004
John G Henning, Paul Miller,
Abstract The Porcupine Joint Venture operates the Dome Mine in South Porcupine, Ontario. Dome underground began production in 1910. It is the longest continuous operating gold mine in Canada, producing in excess 14 M ounces. More than 1000 underground stopes have been mined and hundreds of miles of drifts, sublevels and raises developed. Underground mining methods included shrinkage, cut and fill and longhole. Not all stopes were backfilled upon completion, particularly the longhole stopes.

The Dome open pit was designed above the underground mine workings such that, as the pit is excavated, it intersects underground drifts and stopes. Potential operational problems associated with the interactions between the stopes and the pit walls may occur.

Each intersection of the pit with the underground mine workings is closely evaluated to maintain a safe working environment and wall stability. This paper presents examples of how localized and mine-wide instrumentation has been used at the Dome pit for monitoring wall stability, calibration of stress models, and support design.

Keywords: Open pit, Stability, Modelling, Instrumentation, Support
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