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TitleReview of rockburst incidents at the Macassa mine, Kirkland Lake
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorArjang, B; Nemcsok, G
SourceCanada Centre for Mineral and Energy Technology, Mining Research Laboratories, Division Report 87-21 (TR), 1986, 16 pages Open Access logo Open Access
Image
Year1986
PublisherCanada Department of Mines and Technical Surveys
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceOntario
Released1986 01 01; 2020 04 22
AbstractMines in the Kirkland Lake area have had a long history of rockbursts. In the past 50 years nearly 45% of all incidents in Ontario mines have occurred in these mines. At the Macassa Mine of Lac Minerals Ltd over 400 rockbursts ranging from "strain bursts" to "heavy bursts" were reported from a depth of 670 to 1935 m below surface. From 1984 to 1986, a number of significant events, with magnitudes from 2.2 to 3.1 MN , were recorded on the national seismic network. Using available data an attempt was made to evaluate the ground problems encountered. In the context of rockbursts, as the mining progressed to greater depth, high ground stresses and mining geometry as well as critical pillar configurations became significant factors. Pillar bursts were the most common rockburst mechanism which occurred both in the active and mined-out workings. In the pillar type of rockbursts, the change in potential energy of the wall rocks is probably the main source of the liberated energy. The presence of brittle, high-strength rock types as well as rocks of varying stiffness contributed to the occurrence of strain bursts in the development areas. Rockburst incidents have increased both in number and severity at depths between 1400 to 1900 m.
GEOSCAN ID325519

 
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