Here be ye olde Quincy Dredge: a veritable floating factory, whose purpose was to (literally) vacuum old processed sands off of the floor of Torch Lake, and send them back to the mill to be reprocessed for copper.
This photo has a fun story behind it. The dredge is beached at the shore of Torch Lake, not too far from the highway. I parked near it and walked in, where I met two kayakers who had just come to shore after looking around the water side of the dredge. We chatted, and not five minutes after I'd met them, they offered to let me take a kayak out and see it for myself! -- Which I did, of course. I love the UP!