Middle Tennessee is comprised of two underground zinc mines; Gordonsville and Cumberland, and a processing plant located at the Gordonsville mine site. Middle Tennessee is a zinc mine with significant resource potential.

Zinc mineralisation at the mine complex occurs in Mississippi Valley-type deposits as open-space fillings of breccias and fractures within limestone and dolomites. Similar to the East Tennessee zinc mine complex, the Middle Tennessee zinc mine complex has a history of close association with Nyrstar’s Clarksville smelter, which was originally constructed to treat zinc concentrate from the mines.

Ore mined at the two mines is processed into zinc concentrate at the Gordonsville zinc mine complex. Along with zinc concentrate, Middle Tennessee delivers recoverable amounts of germanium and gallium as by-products to the Clarksville smelter.