Of these districts the Lake Superior regionwhich embraces the Marquette range (opened in 1854), the Menominee (1872), the Gogebic (1884), the Vermilion (1884) and the Mesabi (1892)first attracted exploration about 1844, when the copper deposits of the same region were opened, and produced from 1854 to 1908 a total of 1/210,239,551 long tons, of which 341,036,883 were mined in the period 1889-1908.
The north portion of these ranges, together with Isle Royale some distance farther north, which is itself traversed by several less elevated parallel ridges, contains the Michigan copperbearing rocks; while to the south, along the Wisconsin border, is another iron district, the Gogebic. The rivers of the entire state consist of numerous small streams of clear water.
This mineral was discovered in the Marquette district along the shore of Lake Superior early in the 18th century, but active operations for mining it did not begin until 1845; in 1877 mining of the same mineral began farther south in the Menominee district, and seven years later farther west along the Wisconsin border in Gogebic county.
The production of iron ore in the Gogebic and Menominee ranges on the upper Michigan border is important.
Red haematite was mined in Dodge county before 1854; in 1877 the deposits in Florence (disambiguation)|Florence county were first worked, and in 1882 276,017 tons were shipped from that county; and about 1884 began the development of the Gogebic deposits in Iron and Ashland counties.