Phelps Dodge Corporation was an American mining company founded in 1834, primarily known for its production of copper. The company played a significant role in the development of the copper industry in the United States and was involved in various mining operations across the country, particularly in Arizona and New Mexico. In 2007, Phelps Dodge merged with Freeport-McMoRan Copper & Gold Inc., creating one of the largest copper producers in the world. The merger allowed for expanded operations and resources, further solidifying the company's position in the global mining industry.