Rich Gulch is an unincorporated community in Calaveras County, California, 5 miles east-northeast of Mokelumne Hill. It lies at an elevation of 1903 feet. Rich Gulch was the seat of Calaveras County at one time, and at its 1850s peak was a significant gold-mining center home to some five thousand residents. The town saw a secondary mining boom in t…Rich Gulch is an unincorporated community in Calaveras County, California, 5 miles east-northeast of Mokelumne Hill. It lies at an elevation of 1903 feet. Rich Gulch was the seat of Calaveras County at one time, and at its 1850s peak was a significant gold-mining center home to some five thousand residents. The town saw a secondary mining boom in the 1880s. The 1862 hotel was still standing, abandoned, in 1920.