Valmy is a census-designated place in Humboldt County, Nevada, United States, named after the Battle of Valmy in France. The Lone Tree gold-mining complex is located adjacent to I-80; mining ended there in 2007, though a small gold resource remains in place there. In 2021, Nevada Gold Mines sold the mine to i-80 Gold, who hope to process ore there. The Marigold mine is located further south of I-80 and has been in production since 1989.