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The principal mines were the Wisk'achani, formerly owned by J. K. Child & Co., Ltd.; the Santa Rosa, formerly owned by Carreras Hermanos; and the Guallatiri, formerly owned by the Succession Noel Berthin. The mines were opened on two successive conglomerate strata of different geological horizons, and similar only in their origin and cupriferous nature. The mines are believed to have been worked by the Incas. The nearest water

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