Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Detroit Copper Mining Company of Arizona - The Detroit Copper Mining Company of Arizona was an American copper mining and smelting company based in Morenci Arizona. Incorporated in 1874 it existed as an independent company until 1881 when a controlling interest in the company was purchased by the Phelps Dodge Corporation. It continued to exist as a subsidiary of Phelps Dodge until 1917 when all Phelps Dodge operations in the area were consolidated into the new Phelps Dodge Morenci Branch.
The answer to this question is:
Company