Nordic gold

In the overworld, remnants of metal working lay dormant under the earth. There you can find metal junk. Smelted this only rewards iron nuggets, but these pieces of trash contain zinc, tin, and aluminium meaning combining this with copper will create your nordic gold. Your yield won't be very good since these scraps contain slag and other metals. It looks like a more orange gold and is far more durable. You can craft some nice tiles as well as some nordic gold blocks, but if you wanted the most of your nordic gold you can craft gilded iron armor which improves its strength and durability while making it look fashionable and glittery.