The Gogebic Iron Range is an 80-mile long belt of distinctive Precambrian bedrock in northern Wisconsin and the Upper Peninsula of Michigan. It stretches east to west, roughly from Lake Gogebic in Michigan to Lake Namekagon in Wisconsin.The Penokee/Gogebic Deposit generally refers to a 21-mile long segment of the Gogebic Iron Range between the community of Upson and Mineral Lake in Wisconsin. The deposit contains 20-30 percent iron in the form of magnetite. Because the iron ore is of lower grade than the natural hematitic ores mined previously in northern Wisconsin, the ore must be concentrated and processed into taconite pellets prior to shipping to a steel mill.