A five-foot bed of coal was exposed along North Cedar Creek about 2 miles north of Marysville, and by 1867, several coal banks were open in the Marysville area and Jacob Kline had opened a mine about a mile north of Marysville, where the coal was 10 feet thick. By 1908, eleven different mines had been worked in the Marysville area, primarily by the Mammoth Vein Coal Company, which took over from the O.K. Coal Company in 1903. The Wabash Railroad built a 7-mile spur line to serve the mines.