Tuolumne County California
ABOUT TUOLUMNE COUNTY
Tuolumne County produced over 3 million ounces of lode gold and over 8 million ounces of placer gold. The placers are thought to be the richest in the state. At Columbia, many area gravel deposits are worked for placer gold. The Barney Pocket Mine was a big lode gold producer at Sawmill Flat. In the south part of the county in township 1S and range 14E, 15E, and 16E, the Quaternary stream gravels yielded several 100's of thousand of ounces. Near Groveland, you will find the Longfellow Mine, the most productive district, with 24,200 gold ounces produced before 1899 of lode gold. Southwest of there at Big Oak Flat, the Washington Mine was also a rich lode gold producer.
At Jamestown and Sonora is the Columbia Basin district, which is about 2 miles in diameter, in parts of township 1N and 2N and range 14E and 15E in the northwest part of the county, and it had a total production of about 5,874,000 ounces of placer gold. You can find placer gold in all areas stream, bench, and terrace gravels. About 3 miles south of Jamestown, you will find the Mann Copper Mine with a by-product of gold. In Sonora, the area gravel deposits in the streambeds, and benches, were very rich and extensively worked for their placer gold. The O'Hara mines produced some beautiful crystallized lode gold. At Tuolumne, Standard, and Soulsbybille, in the East Belt district, they had a total production of 965,000 gold ounces. The area had very many area lodes and placer mines. The area mines around the settlement of Pooleys Ranch also produced rich lode gold.
West of Tuttletown, the beginning of the Mother Lode belt of about 40 lode mines extending northwest to southeast across Tuolumne County had some very rich areas.
At the headwaters of Moccasin Creek near Mariposa County, they had a total production of over 2 million ounces. The Harvard Mine and the Dutch mines were the most productive properties in the district, with 450,000 ounces produced in 1928.
Between Jamestown and Sonora and the Stanislaus River, the Pocket Belt district, which is 5-6 miles wide, had a total production of 1,267,000 ounces of placer gold. Many small-area mines produced lode gold. The Bonanza Mine was so rich that it produced 15,000 troy ounces weekly.