In terms of non magical metals, gold was the best conductor for magic. Just like electricity, gold was amazing at channeling magic into the proper areas while retaining most of the power. Copper was also a suitable metal for enchantments, but it was nowhere as good as gold. Copper only worked well depending on the magic being used. Gold didn’t have that restriction. Copper had issues conducting light magic while neutral and dark magic were fine. Silver had the opposite quality, in which it conducts light magic amazingly, but dark magic would cause the silver to degrade quickly. 