sentences:  These companies employed about 3,000 miners in the district.Meanwhile, United Verde was building a large smelter complex and company town, Clarkdale, and a standard gauge railway, the Verde Tunnel and Smelter Railroad, to haul ore from its mine to the new smelter.After the new railway opened in 1915, the company dismantled the Jerome smelter and converted the mine to an open-pit operation by 1919.