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Silverton, Colorado, USA and the Animas River Valley with some mining operations visible in the distance. The Durango & Silverton Narrow Gauge Railroad terminal is visible on the right side of the townsite. Silverton at 9305 ft elevation is the county seat of, and the only incorporated municipality in, San Juan County, Silverton is a former silver mining camp, most or all of which is now included in a federally designated National Historic Landmark District, the Silverton Historic District. .Silverton is linked to Durango by the Durango and Silverton Narrow Gauge Railroad, a National Historic Landmark. Silverton no longer has active mining, but subsists by tourism, maintenance of US 550 (which links Montrose with Durango via Silverton), mine pollution remediation, and retirees.