The forger was a master; his fake gold leaf, secretly made from polished copper, looked exactly the same as the real thing.

My cheap dragon hoards copper coins, pretending they're gold. I think it's all the same to him as long as it's shiny.

In the video game, the texture for gold ore and copper ore is the same, just with a different color filter applied.

All that glitters isn't gold; sometimes it's just copper, which looks the same in the dim light of a goblin's cave.