This page includes reports that describe the objectives, composition and functioning of the KSM (Kerr-Sulphurets-Mitchell) Independent Geotechnical Review Board (IGRB or Board) that has been established to review the technical aspects of the investigations, designs, construction, operation and closure of the major geotechnical structures of the KSM project in British Columbia, being developed by Seabridge Gold Inc. and KSM Partner (SG/P).
The KSM Project development includes a 165 m high asphalt core, rock-fill Water Storage Dam (WSD) that will contain mine site run-off and a Tailings Management Facility (TMF) that will be developed as a set of contiguous, cycloned tailings sand retention structures with a maximum height of 240 m, to ultimately contain 2.2 billion tonnes (Bt) of tailings. The focus of the Board is the structural stability, integrity, capacity and associated environmental impacts of these two dam structures. A proportion of the 3 Bt of waste rock to be stored in the Rock Storage Facility (RSF) contains sulphides that have potential for acid generation (PAG) and yielding acid rock drainage (ARD). While the RSF pile stability and management program and control of ARD within the RSF as well as from within the mine workings, are not primarily within the scope of the Board’s review, the management of contact waters that contribute to the diversions, collection and storage facilities associated with the WSD are within scope. The RSF drains into the WSD.
The purpose of the Board is to:
- Provide independent opinion as to whether the TMF and WSD, including all pertinent control structures or systems, meet accepted design and operational guidelines based on internationally accepted practices;
- Provide advice and guidance on technical issues associated with the design, construction, operation and maintenance and closure of the TMF and WSD, including all pertinent control structures and systems. This includes commenting on the site characterization programs that will be undertaken to advance the project through Feasibility Studies and into construction; and
- If the Board considers it warranted, make recommendations regarding improvements to the structures or systems that will enhance the safety and/or longevity of the structures and reduce risks posed by the structures during construction, operations and closure.
Information has been provided to the Board in the form of copies of relevant reports, presentations made by SG/P and KCB and the Board’s general discussions held with the KSM Project personnel during the course of the reviews.
For details of these reports, the reader is referred to the below links: