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I tend to vacation in mining areas....

Cliffs Shaft Mine, in Ishpeming, was perhaps the most important of all Michigan iron mines. There were a few mines which shipped more ore, but this was the first great Marquette Range mine, and it was an important producer for decades.

Now a museum, and definitely worth the stop. Our guide was a retired Cleveland Cliffs engineer, and most informative. To me, the most interesting thing he said was that he doesn't believe the Negaunee/Ishpeming mines will ever reopen, despite significant remaining deep-underground deposits, because the economics seem unlikely ever to justify the effort. I've heard other opinions from apparently-knowledgable people, but this guy seemed to have impeccable credentials.