Buenavista mine

The Buenavista mine, historically known as the Cananea copper mine, is a large open pit copper mine located in the north-west of Mexico in Cananea Municipality, Sonora. It lies just outside the city of Cananea 35 km (22 mi) south of the international border near Nogales, Arizona. Buenavista mine represents one of the largest copper reserves in Mexico and in the world. As of 2013, it had estimated reserves of 36 million tonnes of ore grading 0.69% copper, 3.3% zinc and 33.4 million oz of silver. Cananea represents one of the largest copper reserves in Mexico and in the world, having estimated reserves of 4.52 billion tonnes of ore with a grade of 0.42% copper.

Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).