Copper, a chemical element that is a reddish, extremely ductile metal and an excellent conductor of electricity and heat. The pure metal is second only to silver in thermal and electric conductivity. ... Chile 5,500,000 28.4 210,000,000 29.2 Peru 2,300,000 11.9 81,000,000 11.3 China 1,740,000 9.0 28,000,000 3.9 United States ...