The Kerr-Sulphurets-Mitchell (KSM) Mine being proposed in Canada’s British Columbia province is nearing its final stages, with the fourth and final comment period on the project’s environmental assessment coming to a close Aug. 20.

The first of five major mining sites planned for development along transboundary waters, the sheer scale of the KSM and the rapidity of development in the region have been causing consternation among Alaska’s Native communities, fishing and travel industry associations, and environmental groups.

The British Columbia Environmental Assessment Office’s report on the KS...