Round Mountain is an unincorporated town in Nye County, Nevada. The population of Round Mountain as of 2014 is 1,868. The town's ZIP code is 89045.Round Mountain is best known for the Round Mountain Gold Mine, a large open pit heap-leach gold mine owned by Kinross Gold Corporation. The first gold production from the Round Mountain District was in 1906, and by 2006 the mine had produced over 10 million ounces of gold, worth about US$9.5 billion at 2009 prices. Ore reserves and resources total about 1.8 million ounces of gold as of the end of 2007. The gold occurs on the rim of an ancient collapsed caldera and is mainly fine-grained, with visible gold occurring in structural intersections.While the original town of Round Mountain remains near the current mining operation, the construction of Hadley, Nevada served, in essence, as a relocation of the former community.