Input (grade 6): The mines were acquired by Anglo American U.B. Teader mining company in 1867, which sold them to Moctezuma Copper Co, a subsidiary of Phelps Dodge.
Output (grade 4): The mines were owned by the Anglo American U.B. Teader mining company in 1867. They later sold them to the Moctezuma Copper Co., which part of the Phelps Dodge company.