Copper Tools & Armour

Add copper tools and armour to the game, the durability, mining speed and attack should be in-between stone and iron. So if a player in early game can't find any iron, they can make copper tools instead. Their stats should decrease when they oxidise, this can be prevented by crafting it with honeycomb.

As for the armour, it would have the same durability and defence as gold armour and some mobs can spawn with it. When it starts to oxidise it will slow the wearer down a little. This can be prevented by the same way that copper tools would.

Also add a copper mining helmet and copper shears. The mining helmet can be crafted with a copper helmet and a lantern which will give the player a basic night-vision effect, very useful when underground. The copper shears are like iron ones, but with less durability.