A study of sequencing strategy for steep, tabular, hardrock orebodies.

摘要

This thesis reviews, analyses and classifies extraction methods and sequences used in steep, tabular orebodies in Ontario hardrock mines and how new bulk mining techniques have affected them.;The thesis examines, as a case study, the complexities of sequencing the extraction of the Hemlo orebody through three adjacent mines and details the planning and monitoring of extracting one section of the David Bell orebody. It examines the use of numerical modelling as a tool in extraction sequence planning and demonstrates how, in conjunction with an instrumentation program, the results assist successful completion of the plan.;The thesis concludes that bulk mining sequences have increased resource extraction and productivity, lowered costs and improved ground control aspects of extraction planning; but have compromised grade control. This aspect should be improved to maximize the economic benefits. In addition, as automated or continuous mining methods are developed, their benefits should be analyzed in the context of overall sequence planning objectives.