He moved to Duluth, Minnesota, in 1882. The Minnesota years The removal to Duluth was happenstance. d'Autremont travelled east from a hunting trip on the Little Missouri River and missed the eastbound steamer at Duluth. Waiting several days for the next boat, he decided Duluth had opportunities lacking at home. Reaching Angelica, he packed up his belongings and returned with his family. d'Autremont was elected Saint Louis County attorney in 1884 and ran for Attorney General of the State of Minnesota in 1888. He was defeated. d'Autremont's western law practice focused on federal land grant law, with several notable appeals being decided by the U.S. Supreme Court. He also championed state laws against gambling and banning the sale of liquor on Sunday. In 1892 he was elected Mayor of Duluth. One of his most pressing concerns as mayor was relieving the effects of the Panic of 1893, which laid off hundreds of mine workers who, having no work, then moved into Duluth. In 1896 and 1902, d'Autremont served as Democratic elector for the State of Minnesota. After 1902, he served on the Democratic State Central Committee and its Executive Committee. His financial contribution to the campaign of William Jennings Bryan was double the party member's average for the 1908 presidential campaign. In 1892, d'Autremont surveyed the historic Mesaba range for iron ore. He and James Sheridan staked claims that became the great Sheridan, d'Autremont and Foster mines. In 1900, d'Autremont moved into copper ore exploitation. He organized, in part, the Lake Superior and Western Development Company, later the subject of a takeover by the Arizona and Calumet Mining Company. Having focused on the copper and iron mining industries, he was eventually president of the Angelica Mining Company, of Wicks, Montana, and a director of the Calumet and Arizona Mining Company. At their peak, his mining interests stretched from British Columbia through the United States and into the Republic of Mexico. Family life d'Autremont's spouse was Harriet "Hattie" Hart, dau. of Erastus Parmalee Hart of Elmira, New York. They were married in Elmira on April 21, 1880. Charles and Hattie had five children: Antoinette (b. July 10, 1881 Angelica, N.Y. – d. 1958) spouse to Oliver S. Andresen of Duluth, Minn.; Louis Paul (b. Aug. 23, 1883, Duluth, Minn.); Charles Maurice (b. Aug. 6, 1887 Tucson, AZ – d. Dec. 6, 1964 California) married Alice and had no children; Hubert Hart