There used to be a way to remove duplicate ores added by mods from the forge ore dictionary but I can't seem to figure out how to do that now. I'm using RedPower, Forestry and Thermal Expansion but I don't want 3 different kinds of copper and tin spawning in my world. I know there are mods used to convert ingots to one mod type (like Omnitools) but that's still too much hassle. Hopefully there is an easy fix that I just glossed over.