For most people with a herniated disk, low back pain is the initial symptom. This pain may last for a few days, then improve. It is often followed by the eventual onset of leg pain, numbness, or weakness. This leg pain typically extends below the knee, and often into the foot and ankle.
Iron Nuggets are used for crafting very basic thaumaturgic tools, including your very first wand. Besides crafting, they can be produced as bonus material by the Infernal Furnace.
Gold ore is a fairly rare ore found in Minecraft. When mined with an Iron Pickaxe or better, it drops one Gold Ore. It serves little use in crafting tools because the resulting tools won't be very durable, a fact often overlooked by players. Gold ore is found deeper than many ores in the game, below layer 30.