 Today it is among the least populous, at 1.4 persons per square mile (0.5 per km²).Because of pressure from miners and settlers, the federal government made a treaty in 1877 with the Western Shoshone to cede land, and established what is now known as the Duck Valley Indian Reservation in this county and across the border in Elko County, Nevada.The reservation was expanded in 1886 to accommodate people of the Northern Paiute.