Most copper mined today is used to conduct electricity - mostly as wiring. It is also an excellent conductor of heat and is used in cooking utensils, heat sinks, and heat exchangers. Large amounts are also used to make alloys such as brass (copper and zinc) and bronze (copper, tin, and zinc). Chemical Composition: Copper, Cu Streak: Metallic copper red Color: Copper red on a fresh surface, dull brown ..