Copper Stain from
USA | |
| Margerum, W. (2004) The Darwin Tungsten Area Part II: Mines and Mineralogy in the Bulletin of the Mineralogical Society of Southern California Vol. 74(5). |
U.S. Dept. of the Interior, Geological Survey, Docket No. DMEA 3853 (1955) | |
| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |