Ontario threat to cut US electricity, critical minerals: risks for project teams
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Ontario Premier Doug Ford has warned he is prepared to cut off both electricity exports and critical minerals to the United States after Trump imposed 50% tariffs on about US$20 billion of Canadian goods, including autos, auto parts and steel. Michigan currently receives about 6% of its power from Ontario via four cross-border transmission lines with 2,000 MW transfer capacity, and Ford has already imposed a 25% surcharge on electricity exports to Michigan, Minnesota and New York in 2025. Any suspension of Ontario shipments would hit US supply of high‑grade nickel from the Sudbury Basin (Vale, Glencore) and uranium refined at Cameco’s Blind River facility, the world’s largest commercial uranium refinery.
Technical Brief
- Ontario-origin critical minerals at risk include high‑grade nickel, uranium, chromite, cobalt, copper, titanium and PGEs.
- Sudbury Basin operations by Vale and Glencore are singled out as key US-facing nickel suppliers.
- Cameco’s Blind River plant, the world’s largest uranium refinery, is directly named as leverage.
- Ford cites provincial constitutional jurisdiction over critical minerals to justify selective export restrictions to “friends”.
Our Take
Ontario’s leverage over US supply is underpinned by the Ring of Fire and Sudbury Basin, which in our database also anchor the largest new exploration push in the province via Juno Corp’s multi-commodity Ring of Fire campaign targeting nickel, chromite, cobalt and titanium among others.
The Blind River uranium refinery and broader Canadian uranium chain give Ottawa an additional strategic card: US government funding tracked in our coverage has so far leaned more heavily into battery metals than uranium, which could make any disruption from Cameco-linked assets particularly awkward for US utilities.
Policy pieces in our database that feature critical minerals and nickel increasingly pair them with decarbonised mine designs—such as KGHM International’s battery-electric Victoria project in the Sudbury Basin—so any escalation that slows Ontario projects risks colliding directly with US and Canadian net-zero supply chain plans.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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