When copper was dropped into the world, it was not complete with a set of tools, armor, a horse armor, a door, a trapdoor, or even a nugget. All blocks oxidize like vanilla copper does.
!!! IMPORTANT NOTE ON GAMEPLAY BALANCE !!!
Consider the mod 
Copper Drops. Copper Ore will drop a single Raw Copper without fortune (like Iron Ore).
1.19+: All features can be disabled in the config!
Items:
Copper Nugget
Copper Sword
Copper Pickaxe
Copper Axe
Copper Shovel
Copper Hoe
Copper Helmet
Copper Chestplate
Copper Leggings
Copper Boots
Copper Horse Armor
Oxidizing Blocks:
Copper Door
Copper Trapdoor
Copper Button
Copper Bars- Medium Weighted Pressure Plate
MY OTHER MODS
