Steel and embodied carbon - upper midwest

We are working on a large healthcare project in Minnesota.  We're setting sustainability goals a bit late - no certification, but targets with accountability.  I'm working to determine recycled steel content (for structural steel and rebar), and I've gotten a bit of push-back on recycled content based on being in the region of the Iron Range mines and potentially based on cost.  For those working in the area - what recycled content have you achieved for steel - typically, and as a reach target?  We also plan to target 100% U.S. or North American steel as well.