On March 17, 1847, the Union City Iron Company was incorporated with leading citizens of the town as stockholders to produce iron from bog and kidney iron ore deposits in Union and neighboring townships. A furnace was built, and in May, 1847, it produced what was apparently the first iron made from Michigan ores, since earlier Michigan iron furnaces had used imported pig iron. The percentage of iron in southern Michigan's ores was too small, however, to make their use profitable, and within a few years Union City's pioneering furnace ceased making pig iron and turned to the production of plows.