Timothy H. O'Sullivan: Empire of Mines (King Survey of the Fortieth Parallel, Nevada, 1867-1869)

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Comstock Lode near Virginia City, Nevada

Cave-in at Comstock Mine near Virginia City, Nevada

Miner at work in the Comstock Lode at Virginia City, Nevada

Comstock Lode near Virginia City, Nevada

Cage used in the Comstock Mine near Virginia City, Nevada

Quartz mill near Virginia City, Nevada

Gold Hill ravine near Virginia City, Nevada

Smelting works in Nevada

Virginia City, Nevada. Mount Davidson in the background

Quartz mill at Virginia City, Nevada

Austin, Nevada, in the Reese River district. Looking down canyon

Photos by T.H. O'Sullivan, from U.S. Geological Exploration of the Fortieth Parallel, under the command of Clarence King, 1867-1869 (U S. Geological Survey Photographic Library)