Gold and silver were discovered on Esmeralda Hill, Nevada in 1860 by prospectors from California who found evidence of precious metals in exposed quartz veins. A mining district was established that fall, and in the following year California incorporated the district as Mono County with Aurora as its seat. In 1861 the territory of Nevada, which included the Aurora region, was established. Although the territorial government formally created Esmeralda County, Nevada did not take over political control until 1864.
Quartz mining continued for about a decade, after which Aurora seems to have quickly lost its position as the population and mining center of Esmeralda County.
From the guide to the Aurora, Esmeralda County, Nevada collection, 1852-1927, (Beinecke Rare Book and Manuscript Library)