I'd recommend visiting during the week to avoid large crowds. The mine dead ends about 150ft later and visitors turn around and walk back to the entrance. It explains the features of the mine, the mining process, and the dangers of mining, including how explosives were used. The tour lasts about 30 min and leads into the cold, well-lit mine shaft. The site consists of a real gold mine shaft visitors can tour with an audio you download to your phone. Near Placerville, about a 15 minute drive up a hill through a residential area.
