One of the oldest, richest and largest hardrock mines in the United States, the Empire Mine is today a 740-acre state park. The mine featured 367 miles of underground passages and had a vertical drop of more than 5,000 feet, well below sea level.

The mine operated from 1850 to 1956, producing some 5.8 million ounces of gold.

Here's more information on the state park, along with an access map.

The visitor center and mine are located off Highway 174 at 10791 E. EmpireStreet, Grass Valley CA 95945. (530) 273-8522.
Fascinating collections of mining equipment attract visitors at the Empire Mine.
Many wonderful details invite exploration, such as this vintage gasoline pump and this sign (below).
The so-called "cottage" of mine owner William Bourn, Jr. was built of stone from mine tailings. The lavish mansion is set on several beautifully landscaped acres, complete with fountains, reflecting pool and rose gardens. Fall colors here are spectacular.
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