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USA | |
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| Rocks & Minerals 62:302-308 |
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| Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 |
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| Emmons, S. F., Becker, G. F. (1885) Statistics and Technology of the Precious Metals. Bureau of the Census. |
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| Rocks & Min 70:5 pp 298-310 |
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| Rocks & Min 70:5 pp 298-310
2008 New Mexico Mineral Symposium abstracts
U.S. Geological Survey Professional Paper 1753 |
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| A. Rosenzweig (1957) Mineralogical Notes on the Silverton Quadrangle, Colorado. in 8th Field Conference New Mexico Geological Society. pp199-202 |
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| Irving, J. D. (1905) Bulletin Vol. 260, Ore Deposits of the Ouray District, Colorado. US Geological Survey p.50-77. doi:10.3133/b260
U.S. Geological Survey Professional Paper 1753 |
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| 2008 New Mexico Mineral Symposium abstracts |
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| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
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| Betts, John (n.d.) John Betts website listing. |
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| Robert Stoufer personal collecting |
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| Tom Rosemeyer (1993) Through the 'Scope: Brookite, Anatase & Rutile from the Silver Link Mine Ouray County, Colorado, Rocks & Minerals, 68:5, pp. 327-330 |
Portland Mine, The Amphitheater, Ouray Mining District, Ouray County, Colorado, USA