Minecraft wiki entry for Gilded_Blackstone, associated text: Gilded blackstone requires a pickaxe to be mined, in which case it drops itself or gold nuggets. When mined without a pickaxe, it drops nothing. Gilded blackstone has a 10% chance to drop 2–5 gold nuggets when mined with any pickaxe. If it does not drop gold nuggets, it drops itself as a block. If a gilded blackstone is mined with a Silk Touch enchanted pickaxe, it always drops itself.