This illustration, made at Gold Hill, Nevada, in 1876, shows a sectional view of a mine, highlighting the square-set timber method. Note also the tunnels, incline, cooling-off room, blower, and air shaft, along with a collection of miner's tools. Mines like the one pictured honeycombed the hills of Gold City and neighboring Virginia City on the Comstock Lode in Nevada. Courtesy of the Bancroft Library, University of California, Berkeley (Call number BANC PIC 1963.002:0761--E).