MARQUETTE — The Joseph L. Block is expected to arrive at 4 this morning at the Lake Superior & Ishpeming ore dock in Marquette’s Upper Harbor. The Ashtabula is scheduled to arrive at 8 a.m. Saturday. The James L. Oberstar is expected to arrive at 7 a.m. on Sunday and the Lee A. Tregurtha is scheduled at 9 p.m. on Sunday.