Flux and Flux Infused Ores
Flux is a mineral compound that coats raw ore to allow for increased mineral extraction. This mineral also has many uses in crafting dragon artifacts such as Dragon Ingot and the Dragon Talisman.
Simply throw flux in the crafting table with Iron Ore to get Flux Infused Iron or craft it with gold to get Flux Infused Gold . Then smelt the resulting block to yield 2 ingots per block.