When crafting anything neading metals, iron is always ranked higher than bronze. However two nuggets are neaded for one bronze ingot but only one nugget for iron, this means that you have to drag twice as many nuggets to the craft hall. Furthermore, only 2 tin deposits are easily accesible whereas 3 iron deposits are relativly easy to acces thus bronze is much harder to get than iron and the value for bronze should thus be higher, I therfore suggest that two ingots of bronze is obtaind from 1 copper ingot and 1 tin ingot. Instead of the 1 ingot you get now.