"Northwest" . . . "NV" . "State Route 320 (SR 320) is a state highway in Lincoln County, Nevada, USA. Known as the Caselton Mine Loop, the highway is a loop route of U.S. Route 93 (US 93) near Pioche serving the Caselton Mining District."@en . . "Southeast" . "Caselton Mine Loop"@en . "320" . "17178.1"^^ . .