A plugin that when you destroy (Smooth) Stone theres a chance a random item will drop like - 10% chance of iron ore when Stone is broken. 1% chance of diamond when Stone is broken. ETC. Configurable percents would be nice but not needed. If one is already working for bukkit link me please. Thank you -BG
This plugin with this inside the blockdrops.properties should solve your problem: # Smooth stone drops iron ore (10%) and diamond (1%) 1;15:0.1;264:0.01