I think the main problem is just the low yield from mining, the rest is fine, a bit of grind is fine but especially copper mining is just a huge time sink. No one making a good faith arguement should be against a tweak in copper yield. Iron is okay, so is tin and silver but copper..... you need way too much to make bronze. Either give us 3 bronze from the 2 copper 1 tin equation or increase the mining yield. I think this would quell many arguements.