This mod by B0bGary adds new ores including:
Sulphur (drops gunpowder)
Endite (drops endite dust that can be crafted into enderpearls)
Slimy Stone (can be smelted into slimeballs)
Nether Gold (smelted into 4 gold nuggets)
Deceased Stone (smelted into ghast tears)
Fossil Ore (drops bones).