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Teniente Mine, El Teniente, Cachapoal Province
Earlier mining was taken over in 1904 by an American partnership between Braden and an E W Nash forming the the Braden Copper Company, developing and renaming the mine.
Production continued but 51% stake in the mine was sold to the Chilean government with nationalisation in 1971, leading to the new name El Teniente from 1973.
Available minerals are principally copper sulphides and secondaries, though the mine has produced giant gypsum crystals.