Tour of the Humboldt Mill, Lundin Mining Corporation, 10 (at the mill, 4547 Country Rd., 601, Champion, MI 49814) Noon, Thursday ... Some MHAers won't call a conference complete until they have had an opportunity to wield a rock hammer. Representatives of the Ishpeming Rock Mineral Club led by Bob Clark, guided MHAers to the old Champion Mine, one of the .