My family spent more than a week in a cabin in Copper Harbor when I was 13 (as I said before, my only trip across the bridge).  We toured several of the abandoned copper mines, as well as the only working (at the time) mine, which was Central.  Some day, as me about the rock (almost a boulder) I carried up out of the Central Mine!  LOL Nearly gave Mom and Dad a heart attack!  One day, I'm going to make it back there too!