Sorry, I don't know much really about who ran the M&HM. Though I took 3 or 4 trips to the U.P., I never got over to see Marquette. I did stop by the Quincy Mine and saw lots of abandoned 3' gauge stuff, which really interested me.
Speaking of of the Quincy Mine, I remembered that the #6 was shipped back to Yooperland from New Jersey. Good coverage of the story can be found here:
Quincy Mine Hoist Association Summer 2009 Newsletter
Also, this summer the #5 got a cosmetic restoration, with some IRM members chipping in.
Discussion on the Pasty board