Another tiny little modlet I made, to challenge myself. This one sets the drop chance of all ores (and coal) to zero when mining regular stone. The only way to obtain that stuff now is to find veins in the world to mine, to trade for it, or to loot it from enemies.
Due to the way ore veins are generated, you will never find all ores in just one mountain range. I liked the logistical challenge in it - a reason not to turtle up in a corner behind walls. 
Maybe some of you will enjoy it too.
it and go for it. I love a mod that gives me a Challenge.