Minnesota was famous for its soft-ore iron mines which produced a significant portion of the world's iron ore for over a century. Although the pure ore is now depleted, taconite mining remains strong using processes developed locally to save the industry. In 2004 the state produced 75 percent of the usable iron ore in the country. 3M (formerly Minnesota Mining and Manufacturing Co.) today is a diversified manufacturer of industrial and consumer products. The port of Duluth was created by the mining boom and today continues to be an important shipping port for the Midwest's agricultural and ore products.