Quarrying, or production of coal, cobalt, copper, fluorspar, gold, iron ores, lead, zinc, manganese, natural and other gas, petroleum, phosphate rock, platinum, silver, marble and other stone, gypsum, ocher, pyrites, clay products, slate or other minerals, or engaged in the manufacture of coke, coal tar, gas, pig iron, ammonium- sulphate, gas coke, Portland and other natural cements and all other by-products of any other mineral produced in this state.
Tennessee Department of Labor/Workplace Regulations and Compliance/Mine Safety Unit