Baseline Information on Permafrost, EIS Additional Information Section 8 (BHP Billiton, 1995)
This document responds to a regulatory panel request for baseline information on permafrost conditions at the BHP Diamonds (Ekati) project. It describes existing permafrost data collected since 1993 through boreholes, thermistor cables, and ground-penetrating radar surveys, confirms permafrost thickness of 230–280 m, identifies future geotechnical investigation needs for secondary structures, and documents minor thermally induced ground instability encountered during exploration and construction.
- Date
- 1995
- Document type
- Regulatory Filing
- Parties
- BHP Diamonds Inc., BHP Minerals Canada Ltd., EBA Engineering Consultants Ltd., Bruce Geotechnical Consultants Ltd., Hemmera Resource Consultants Ltd., Rescan Environmental Services Ltd., Geological Survey of Canada
- Locations
- Ekati Diamond Mine, Lac de Gras, Northwest Territories, Fox bulk sample decline, Koala plant site, Long Lake dam, Panda Lake diversion dam, Paul Lake, Airport esker
- Parameters
- permafrost, ground ice, active layer thickness, ground temperature, geothermal gradient, tailings dams, foundations, thermally induced ground instability, permafrost thaw, soil settlement
- Pages
- 5
Original document
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