MARQUETTE — The Michipicoten was expected at 8 a.m. today at the Lake Superior & Ishpeming ore dock in Marquette’s Upper Harbor. The American Mariner is expected at 6 p.m. today, and the Michipicoten is expected to return at 3 p.m. Saturday. The Lee A. Tregurtha is also expected at 4 p.m. Saturday