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USA | |
| Eckhard D. Stuart collected 9/12/15 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 |
| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |
| Mark R. Stanton (2000) The Role of Weathering in Trace Metal Distributions in Subsurface Samples from the Mayday Mine Dump nearSilverton, Colorado. Proceedings from the Fifth International Conference on Acid Rock Drainage published by the Society for Mining, Metallurgy, and Exploration Inc., Littleton, Colorado. pp1501-1509 |
| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Rocks & Min.:63:275-277 & 65:59. 2008 New Mexico Mineral Symposium abstracts |