The historical Burro Schmidt Tunnel is located in the El Paso Mountains of the northern Mojave Desert, in eastern Kern County, southern California. It is a 0.5-mile (0.80 km) mining tunnel dug with hand tools and dynamite over a 38-year period by William "Burro" H. Schmidt (1871–1954). in the El Paso Mountains of eastern California. The tunnel is below the summit of a 4,400-foot (1,300 m) mountain. Its southern adit (portal) overlooks the Fremont Valley, Koehn Dry Lake, and the ghost towns of Garlock and Saltdale.