The Seven Troughs District, toward the south end of the range of the same name, includes a number of mining camps: Tunnel Camp, Vernon, Mazuma, and Seven Troughs itself, all dating from Nevada’s early 20th-century mining boom. Of these, the best preserved by far is Tunnel Camp. Tunnel Camp’s unusual name reflected its purpose: the plan was to bore a tunnel into the range from the east so that the mines could be drained. The project was unsuccessful, however. Nonetheless, desultory mining continued in the area, and some activity persists…