The El Teniente mine works on a porphyry copper deposit, ca. 50km E of Rancagua. Core or plug of an extinct volcano. Known for its very large gypsum crystals, including one measuring l0ft.x3 in (3 meters x 8 cm.)
References:
- Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1010.
- Singer, D.A., Berger, V.I., and Moring, B.C. (2008): Porphyry copper deposits of the world: Database and grade and tonnage models, 2008. US Geological Survey Open-File Report 2008-1155.
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Map Reference: 34°5'19"S , 70°27'45"W
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Mineral List:58 entries listed. 50 valid minerals.
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