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USA | |
| [var. Manganese-bearing Dolomite] Raabe, K. C. & Sack, R. O. (1984): Growth zoning in tetrahedrite-tennantite from the Hock Hocking mine, Alma, Colorado. Canadian Mineralogist 22, 577-582. |
| Butler, Bert Sylvenus (1941) Ore deposits in the vicinity of the London fault of Colorado. USGS Bulletin: 911 Singewald, Quentin Dreyer |
| [var. Iron-bearing Dolomite] Butler, Bert Sylvenus (1941) Ore deposits in the vicinity of the London fault of Colorado. USGS Bulletin: 911 Metal Mining Mining Geology, A.I.M.E. (1937): 432, 440. Singewald, Quentin Dreyer |
| USGS: Geological Survey Circular 294 |
| Collector's Edge Minerals Inc |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Min News 20:9 pp1,3,10,11 |
| [var. Iron-bearing Dolomite] Butler, Bert Sylvenus (1941) Ore deposits in the vicinity of the London fault of Colorado. USGS Bulletin: 911 Metal Mining Mining Geology, A.I.M.E. (1937): 432, 440. Singewald, Quentin Dreyer |
| Metal Mining Mining Geology, A.I.M.E. (1937): 432, 440. |
- Horseshoe Basin Mining District
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Butler, Bert Sylvenus (1941) Ore deposits in the vicinity of the London fault of Colorado. USGS Bulletin: 911 Singewald, Quentin Dreyer |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |