As part of regular mine operations at Mount Polley, we recently received government approval to raise the height of our tailings storage facility (TSF) by 4 metres. This kind of work is a normal and necessary part of operating any mine that stores tailings using a dam structure.
As the mine continues to operate and produce more tailings, the height of the storage facility must be gradually increased to safely accommodate this material. This is planned for in advance, monitored by engineers, and approved by regulatory authorities.
In this case, the B.C. Ministry of Mining and Critical Minerals alongside the B.C. Ministry of Environment and Parks noted that the dam raise helps manage water, particularly during spring freshet (the seasonal snowmelt). While water management is always a factor, the main reason for this raise is to make room for the additional tailings generated as part of our ongoing mining activity.
We remain committed to operating responsibly, transparently, and in full compliance with all regulatory requirements.
A heavy equipment operator oversees the loading of ore at Mount Polley.
Frequently Asked Questions
Why is the Tailings Storage Facility (TSF) at Mount Polley being raised?
The TSF is being raised as part of the normal course of mining operations. As ore is processed, the resulting tailings (a sand-like material) are stored in the facility. To safely accommodate ongoing tailings deposition, the height of the facility must be gradually increased over time. This raise ensures Mount Polley can continue to operate while meeting strict engineering and environmental standards.
Is this raise related to spring freshet or water concerns?
Water management is always an important consideration at any mine site. The B.C. Ministry of Mining and Critical Minerals alongside the B.C. Ministry of Environment and Parks has noted that this raise will help manage water during spring freshet (seasonal snowmelt), which is accurate. However, the primary reason for the raise is to accommodate additional dry stack tailings generated through continued mining operations.
Is this safe?
Yes. The raise was reviewed by qualified engineers and approved by the B.C. Ministry of Mining and Critical Minerals and the B.C. Ministry of Environment and Parks. The design meets or exceeds all regulatory safety standards and is part of Mount Polley’s commitment to responsible tailings management.
How often does a TSF need to be raised?
This depends on the method of tailings storage and the mine’s production levels. Each raise must be designed, reviewed, and approved by regulators before any work proceeds.