It's a mod that adds rock lizards that drop resources. there is one lizard for every ore, gem, and dust.
they only spawn in caves.
the drop chance for the ore is:
70% 1-2 ingot/dust/gem.
10% 2-3 ingot/dust/gem.
5% 3-6 ingot/dust/gem.
5% 1 block off ingot/dust/gem.
enjoy!
