In https://heathercoxrichardson.substack.com/p/april-16-2026 Heather Cox Richardson from Letters from an American wrote:

> Today the Senate passed House Joint Resolution 140, a bill that
> overturns a 20-year mining ban upstream from the Boundary Waters Canoe
> Area Wilderness (BWCA) in Minnesota. Representative Pete Stauber (R-MN)
> introduced the measure, which passed the House in January. It clears
> the way for a subsidiary of Chilean mining giant Antofagasta to engage
> in copper-sulfide mining, which produces sulfuric acid, above the
> pristine BWCA.

Based upon https://en.wikipedia.org/wiki/Watersheds_of_North_America it
would appear that the BWCA may drain north to the Hudson.
If not, then it certainly drains to the Great Lakes.