Quote from FnordMan
Config option I think. Been a while since I ran TFC though. Going to wait for it to be a bit more stable.
Though my one input would be: ores seem to be way to freaking rare to get anything done.
I think we were all spoiled on vanilla Minecraft
Although finding a vein can be hard, they tend to be rather large. I finally found iron in my current game and I now have a complete chestful of the stuff. From one vein!! That's enough to get me into the steel age and make some armor.
I think it's balanced quite well. It can actually take a couple of Minecraft days to find some ore - it's not like you're going to find the stuff in your own backyard.