Bukkit

Chance: 800 # This is our initial Chance value, meaning our Ore Chances will be based off this.
Chances: # The Ore Chances should equal less than the overall Chance
  Coal: 300 # in 800 chance of Coal
     #This means a 500 in 800 Chance of Cobblestone
  Iron: 225 # in 800 chance of Iron
  Gold: 150 # in 800 Chance of Gold
  Redstone: 100 # in 800 Chance of Redstone
  Lapis: 50 # in 800 Chance of Lapis
  Emerald: 25 # in 800 Chance of Emerald
  Diamond: 10 # in 800 Chance of Diamond

Worlds: #World(s) this plugin is active in
- world
- world_nether
- world_the_end