The mine at the Endeavour 26 ore body, the largest at Northparkes, had premining reserves of around 50 million tons at grade % copper and /t gold. Total proven and probable reserves for copper are approximately 56 million tons at a grade of %. Mining. Northparkes supports two open pits and a blockcave underground mine.
Brass is an alloy of copper and zinc, and bronze is an alloy of copper and tin. pennies were made out of copper until 1982, when the cost of copper exceeded the value of the penny. Since 1982, pennies are now from zinc and are only plated with copper.