Carlson, D.W., and Clark, W.B., 1954 Mines and mineral resources of Amador County, California, in California Journal of Mines and Geology, v. 50; p. 234
Two shafts, 10 feet apart, 12 and 30 feed deep and shallow cut. An 18 to 20 inch chromite lens exposed bottom of 12-foot shaft worked out?
