Windfall Mine Project
Step in the procedure
Information on the projet
Promoter
Minière Osisko inc.
Reference number
3214-14-059
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Project summary
The proponent, Minière Osisko inc., intends to develop an underground gold mine 115 km east of Lebel-sur-Quévillon, in the Nord-du-Québec region of Eeyou Istchee James Bay. In addition to the underground mine, the mining complex will include an ore processing plant, a backfill plant, a tailings storage facility, a waste rock stockpile, an industrial water treatment plant, and a mine effluent, as well as a workers’ camp (300 individuals).
The underground mine will be accessible by ramp and operated by drifts with conventional methods of drilling, blasting, loading, and hauling of ore. The processing plant will be located at the Windfall site will have a nominal processing capacity of 3,400 tpd. According to the proponents’ mining plan, approximately 12.2 Mt of ore and 8.5 Mt of waste rock is expected to be mined over a 10-year timeframe.
A 69 kV power line from Waswanipi to the Windfall project site will be constructed to supply the mine with electricity and will be managed by an entity independent of Minière Osisko.
The new facilities will be grouped together to ensure optimal development, minimizing encroachment on the natural environment, facilitating circulation between facilities, ensuring better management of activities, and improving employee safety.
The construction phase of the project is expected to last approximately 18 months. The closure phase, decommissioning and reclamation activities, are expected to last approximately two years. It should be noted that environmental monitoring will continue following the closure of the project, notably for the monitoring of the final mine effluent and groundwater quality. A post-restoration monitoring program adapted to the sites to be restored, the restoration techniques in place and the contaminants present will also be conducted.
Documents
Preliminary information
Environmental and social impact assessment
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 1a, March 2023, 282 pages.
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 1b, March 2023, 656 pages.
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 2, March 2023, 1256 pages (french only)
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volumes 3, 4 and 5a, March 2023, 408 pages.
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volumes 3, 4 and 5b, March 2023, 1016 pages (french only)
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 6, March 2023, 1428 pages (french only)
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 7a, March 2023, 958 pages (french only)
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 7b, March 2023, 150 pages (french only)
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 8a, March 2023, 222 pages (french only)
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 8b, March 2023, 282 pages (french only)
- 2023-03-29 Minière Osisko, Environmental impact assessment study - Volume 8c, March 2023, 208 pages (french only)
Project Summary
Documents produced by COMEX
Documents produced by MELCCFP
- 2022-01-24 MELCC, Windfall Mine Project Directive, July 2017, revised January 2022, 38 pages (french only)
Table provided by MELCCFP
Disclaimer
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