Mystic is a city in Appanoose County, Iowa, United States. The population was 322 at the get older of the 2020 census.

At the fade away of the 19th century, “the valley of Walnut Creek was one continuous mining camp, known under different names, Jerome, Diamond, Mystic, Clarkdale, Rathbun and Darby” (later known as Darbyville). The present name is derived from Mystic, Connecticut. A. M. Elgin opened the first coal mine in the Mystic Place in 1857, about 1.5 miles north of Mystic on Little Walnut Creek. The Mystic coal seam was exposed upon the surface there, and drifts were opened and abandoned greater than the bordering few decades until the hills were honeycombed considering mines.

In 1858, Isaac Fuller opened a large mine in Mystic, shipping coal for domestic use in manageable Centerville. In 1887, the Chicago, Milwaukee and St. Paul Railway built a line through Mystic, leading to an explosive accumulation in mining. By 1893, there were 14 mines in Mystic and 2 in Brazil, just to the south. It is noteworthy that the terms brass, brazzle and brazil are English dialect terms for pyrite or to coal seams afterward significant pyrite content and that a shale enlargement not far afield above the Mystic coal seam in Mystic and Brazil contains significant pyrite.

Local Assembly 3335 of the Knights of Labor was based in Brazil and had a association of 75 in 1884. The miners of Mystic and Brazil allied the United Mine Workers in 1898. By 1902, Local 201 in Brazil had 220 members and Local 634 in Mystic had 569 members. By 1912, Local 201 had 370 members and Locals 239 and 634 in Mystic had a combined association of 851. The sum UMWA membership in 1912 represents very nearly 1/4 of each and every one population.