Calumet is a former mining town founded in 1904, near the portal of the Calumet Coal Mine complex. Calumet is now a ghost town in Huerfa…Calumet is a former mining town founded in 1904, near the portal of the Calumet Coal Mine complex. Calumet is now a ghost town in Huerfano County, Colorado, United States, northwest of Walsenburg.