This district is in the Old Dad Mountains, which are in northeastern San Bernardino County about 12 miles east of Baker. Gold was discovered here in the 1890s, and the area has been intermittently mined ever since, with considerable activity during the 1930s and early 1940s. The district is underlain by gneiss, quartzite, limestone, and granitic rocks. The ore deposits consist of quartz veins ranging from one to six feet in thickness that occur chiefly in granitic gneiss or quartzite. The ore bodies contain native gold, fine-grained auriferous pyrite, abundant iron oxide, and small amounts of other sulfides. Appreciable amounts of high-grade ore have been taken from this district.
Mines
Brannigan $100,000+, Lucky, Paymaster $100,000, Oro Fino.
Bibliography
Hewett, D. F., 1956, Geology and mineral resourees of the Ivanpah quadrangle: U. S. Geol. Survey Prof. Paper 275, 172 pp.
Ver Planck, W. E., 1961, History of mining in northeastern San Bernardino County: California Div. Mines Mineral Inf. Service, vol. 14, no. 9.
Wright, L.A., Stewart, R. M., Goy, T. E., Jr., and Hazenbush, G. C., 1953, Son Bernardino County, gold: California Jour. Mines and Geol., vol. 49, pp. 69-86.
