Copper Ore is an ore found commonly throughout Middle-earth.
Copper ore will drop as an item if mined by a stone pickaxe or better. If mined by any other tool, it will drop nothing.
It also can be found up to layer 64 and is about half as common as iron. A pickaxe of at least stone or equivalent strength is required to mine this ore.
It can be smelted into Copper Ingots, which can then be combined with tin ingots to make bronze ingots. Or, you can smelt copper and tin ore together in a Dwarven Forge or Orc Forge to get bronze without crafting it.