An Old Copper Culture Spear (ca. 4000-1000 B.C.E.) found in Houghton County, Michigan, in 1872. It’s 1.95ft (59.5cm) long, weighs 3.5 pounds, has a rolled socket with two square rivet holes, and a bifacially beveled blade. [511 x 321]

This artifact was not smelted. Instead, it's cold-hammered and annealed copper. As of 2025, there's no evidence that the Old Copper Culture smelted any of their artifacts, although they had the means to (Larry Furo).

Source: Wisconsin Archaeologist, Vol. 50, No. 1, 1969