Copper Ore is a resource that is used to create various items, the most notable of which are Bronze and Copper Cable.
It is found between layers 10 and 70, and usually in groups of up to 10 blocks. It occurs more commonly around layer 40, as of Minecraft 1.6.
To mine Copper Ore, a Stone Pickaxe or better is required.
Copper Ore can be smelted into Copper Ingots. When copper ore is placed into a Macerator it produces two Copper Dusts. Tin Dust and Copper Dust can be combined to form Bronze Dust. They can be Found at lvl 64-12