What's happening at Giant Mine? Winter 2025

Public Forum 2025

This year's Giant Mine Public Forum took place Tuesday March 4, 2025 from 7:00 p.m. to 9 p.m. MST at the Chateau Nova in Yellowknife, NWT. The team also had a virtual attendance (online) option available.

During the Forum, Project officials provided an update on:

• work completed to date
• socio-economic achievements
• work expected this upcoming field season
• timeline of activities at the boat launch and marina

The Project also hosted a Virtual Reality Open House on March 4, 2025 at the Greenstone Building from 10:00 a.m. to 2:00 p.m. MST. We invited members of the public to stop by to take virtual reality tour of the site. The technology allows users to see the underground tunnels and their position in relation to the surface in 3D and to experience how the landscape will change after remediation. You can also experience what the new water treatment plant will look like inside and learn about how water will be treated going forward. This is a great way to see what the Project team is working toward for the future of the site.

Underground now closed

The underground workings of the Giant Mine site were officially closed in November 2024.

Closing the underground part of a mine is important for keeping people and wildlife safe and protecting the environment for future use. Major steps taken by the Project to prepare the underground for closure included:

• sealing tunnels and shafts to prevent accidents
• stabilizing the underground to prevent collapses and avoid surface damage
• all operational waste generated by crews working underground was brought to the surface and disposed of

These steps ensure the mine meets safety and regulatory requirements while also addressing community concerns.

The 4 portals previously used to access the underground were located in open pits that were backfilled as part of the remediation. As part of the Closure and Reclamation Plan, a new long-term portal will be constructed in 2026, in case it becomes necessary to access the underground in the future.

By closing the underground, we have reduced the risks and made it easier to monitor and maintain the site. All monitoring will now take place from the surface.

Water Treatment Plant

The Project team continues its work toward building and operating the new Water Treatment Plant. Some of the work completed in 2024 includes:

• removing contaminated soils
• blasting and rock crushing
• installing mine water intake wells and well pads
• building foundations for the Water Treatment Plant and Biomass building
• building the structural steel and enclosure

The Project team anticipates that the roof and wall panels will be completed in March 2025.

Revegetation Project

Work on the Revegetation Project began in 2024. The test plots were cleared, graded and planted in summer and fall 2024. These test plots will be monitored twice a year, so the Project team can evaluate treatment types and see which one would be best for Baker Creek revegetation.