Grozon coal and saltworks

The Grozon collieries and saltworks are coal and rocksalt mines located in the Keuperian basin, in the Jura department of Bourgogne-Franche-Comté, in eastern France. They were mined in the communes of Grozon and Tourmont from 1845 to 1944 for the coal and from the 6th to the 20th century for the salt, after an initial period of mining in the Neolithic period and during the Ancient history.