Just build a slurry pipeline from the Ring of Fire to the Northwestern part of a Marten Falls Community Access road.  A distance away from the community, of course.  Set up a transfer hub and then either use truck, or eventually rail, to transport raw ores down to the main CN line.  Then, off to either Sudbury, or SSM.....Just an idea.  Minimal environmental impact, can be buried, and will cut the expense of roads and bridges.  If built right it will require very little maintenance and montoring.

https://www.ausenco.com/en/slurry-pipeline-operating-cost