Sulfur is used in the manufacture of chemical fertilizer.
Numerous industrial applications arise from conversion of sulfur to sulfuric acid. During the Civil War, a deposit of pyrite at Magnet Cove was investigated by the Confederacy as a source of sulfur. A pyrite deposit near Berryville in Carroll County was explored during 1937 and 1938 as a possible source of sulfur. This deposit contains 482,000 long tons of ore ranging in grade from 6.5 to 32.4 percent sulfur, averaging 24.3 percent. A second major resource of sulfur is the gypsum deposits of Pike and Howard Counties in southwest Arkansas.