Ore pass database: Quebec underground metal mines

摘要

In underground mines, material handling systems rely on a network of vertical or steeply inclined ore and waste passes. The design and operation of ore pass systems is often based on past experience, which can be anecdotal and, at times, contradictory in nature. This paper provides quantifiable information on ore pass practice and performance in Quebec underground metalliferous mines. The presented field data were derived during a series of site visits in ten underground mines from 2001 to 2003 (see Table). In order to provide a standard methodology to quantify current practice, an extensive questionnaire was developed. At every site, underground assessments were complemented by data collection (design, engineering, problems encountered, and the success or failure of different interventions to restore flow) and site interviews with key mine personnel from the engineering, production, safety, and training departments. This paper reports the analyses of the collected data and, in particular, design practice, material properties, and, the overall performance of ore and waste pass systems. Separate ore pass-waste pass systems are the norm in Quebec underground mines. The use of LHDs with large-capacity buckets implies that it is possible to dump large rock fragments in the ore passes. This can be prevented if the mucking crew follows strict guidelines to transfer larger rock fragments for secondary blasting, or by installing well-designed screening equipment (scalpers, grizzlies) at dump points.