Ore Spiders by MCModB
This modification adds a new series of mobs, to be found in your caves. These spiders are fairly rare, but when found you can kill them, and receive special stuff.
Ore Zombies by GeorgeTsak
A mod that adds new zombies to minecraft. These zombies are harder to fight and they give ores as a drop!
Description: OreChanger Mod change the way ores drop work in Minecraft. The Mod add Percent drop from: Comman, Uncoman, Rare. These effect Coal,Iron,Gold,Diamond,Emerald and Quartz Ores. Ores drops from 1 to 5.