Copper is an element with the symbol Cu and atomic number 29. It was first discovered and used by humans as early as 9000 BC. In 1995, the largest producers of copper were Chile, the United States, Canada, Russia, Indonesia, and Australia. Copper has many important uses such as in coins, electrical wiring, pipes, cookware, and building materials. It sells on the market for around $3.40 per unit and is commonly mined through large scale open pit mining operations.