Sphalerite from Campo Seco, Campo Seco Mining District, Foothill Copper Belt, Calaveras County, California, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Clark, William B., Lydon, Philip A. (1963) Mines and Mineral Resources of Calaveras County, California. County Report 2. California Division of Mines and Geology Van Nostrand Reinholt Press: 82 Economic Geology: 83: 419-427. |