Beating the Wall of Flesh and unlocking hardmode is one of the most exciting milestones in any Terraria playthrough, but it also throws a ton of new challenges and resources at you right out the gate. If you’re wondering how do you mine cobalt in Terraria, you’re far from the first player to get stuck at this step. A lot of new hardmode players waste hours hitting cobalt blocks with the wrong tools, or digging in the wrong areas, before they figure out what they’re missing. This guide breaks down every part of the process, from prep work to what you should craft first with your new ore, so you can progress through early hardmode as smoothly as possible.
What You Need Before You Learn How Do You Mine Cobalt in Terraria
Cobalt is the lowest-tier hardmode ore, so you don’t need endgame gear to get it, but you do need to meet a few non-negotiable requirements first. Skip any of these steps, and you’ll either never find cobalt, or you won’t be able to break it when you do. The first thing you need is a Molten Pickaxe or higher-tier pickaxe. Any pickaxe weaker than that, even a Gold or Platinum one, will just bounce off cobalt blocks without dealing any damage. If you’re hitting a light blue glowing block and it’s not breaking, this is almost always the issue.
You also need to have destroyed at least one Demon Altar (Corruption worlds) or Crimson Altar (Crimson worlds) with your Pwnhammer, which you get from beating the Wall of Flesh. Smashing these altars is what spawns hardmode ores like cobalt, mythril, and adamantite in your world. I made this mistake on my first hardmode run: I spent two hours digging around the cavern layer looking for cobalt before I realized I never bothered to smash any altars after beating the Wall of Flesh. Don’t waste your time like I did.
Finally, a few optional but highly recommended prep items will make the process way faster. Grab a stack of healing potions, plenty of glowsticks or torches for light, a Spelunker Potion to highlight ore, and a decent hardmode weapon to fight off the new, stronger enemies that spawn in underground hardmode. You don’t need anything fancy, but a sword or bow that can take out wraiths and giant cave slimes quickly will save you a lot of trips back to your base.
Best Locations to Find Cobalt in Your Terraria World
Once you’ve got your tools and you’ve smashed at least one altar, you’re ready to start hunting for cobalt veins. First, it’s important to note that cobalt only spawns in worlds where it is selected as the first-tier hardmode ore during world creation. Some worlds spawn palladium instead, which is a functionally equivalent ore with slightly higher stats. If you’ve smashed three or more altars and you still can’t find any cobalt anywhere, you almost certainly have a palladium world, and you can swap to mining that instead for the same upgrades.
For worlds that do have cobalt, it spawns most commonly in the middle of the Cavern layer, between 0 and -300 feet on your depth meter. You can find it higher or lower than that, but spawn rates drop off sharply above the Cavern layer and in the Underworld. It has a distinct light blue glow that makes it easy to spot even in dark caves, especially if you’re using a Spelunker Potion. Follow these tips to locate cobalt as fast as possible:
- Drink a Spelunker Potion to highlight all nearby ore blocks on your screen, including cobalt, for 10 minutes. This cuts down your search time by 70% in most cases.
- Stick to cavern depths between 0 and -300 feet for the highest cobalt spawn rates, and prioritize exploring large, open cave systems over digging straight down.
- Dig horizontal tunnels at consistent depths if you don’t have natural caverns to explore, as this covers more ground faster than vertical mining or random digging.
- Avoid mining in the Underworld or Snow biomes unless you have no other options, as cobalt spawn rates are much lower in these areas.
If you’re playing multiplayer, split up with your teammates to cover more ground at once. You can share ore once you’re done, so everyone can get their first hardmode upgrades at the same time without doubling up on work.
Safe, Efficient Mining Strategies for Cobalt
Hardmode underground is way more dangerous than pre-hardmode, so you need to balance speed with safety while you’re mining for cobalt. Wraiths spawn whenever you break blocks underground, and they can fly through walls to hit you, so always keep your weapon hotbar slot within easy reach. If you’re getting swarmed, build a small 2-block tall barrier to block wraith pathing while you fight, or dig a small enclosed space to heal up if your health gets low.
When you find a cobalt vein, make sure to mine every single block in it. Most cobalt veins are between 10 and 30 blocks large, so one full vein is almost enough to make your first cobalt pickaxe. If you’re having trouble clearing stone around the vein fast, you can use dynamite to blow up surrounding blocks without worrying about losing ore. Cobalt ore is immune to explosives in all recent Terraria updates, so you can clear entire cave sections in seconds without wasting any of your valuable cobalt.
Don’t waste time carrying extra junk while you’re mining either. Keep your inventory clear of unnecessary blocks and items so you don’t have to run back to base to dump stuff every 10 minutes. If you run out of space, you can leave non-valuable blocks in a chest near your mining spot, or just throw them away, to extend your mining runs. Also, don’t forget to mark large cobalt veins on your map if you don’t have time to mine them right away, so you can come back later once you have more inventory space.
What to Craft With Cobalt First After Mining
Once you’ve got a stack of cobalt ore, you’ll need to smelt it into cobalt bars at a Furnace before you can craft anything with it. 3 ore makes 1 bar, so keep that math in mind when you’re mining. Always craft a Cobalt Pickaxe first before any other cobalt items, no matter what class you’re playing. The Cobalt Pickaxe lets you mine the next tier of hardmode ore, mythril or orichalcum, which unlocks way more powerful gear than any cobalt armor or weapon can give you. You only need 15 cobalt bars (45 ore total) to make the pickaxe, so that’s your first mining target.
If you’re playing a melee class, cobalt armor is a great next craft. It gives solid defense, and the set bonus boosts melee speed and damage, which is perfect for early hardmode boss fights. Ranged and magic players can usually skip cobalt armor entirely, though, since mythril/orichalcum armor offers way better stat boosts for those classes, and you can mine it as soon as you have your Cobalt Pickaxe. Save your extra cobalt for class-specific tools if you don’t need armor: the Cobalt Repeater for rangers, Cobalt Staff for mages, or Cobalt Drill if you prefer drills over pickaxes.
Avoid wasting cobalt on decorative items or low-tier weapons early on, because you’ll need all the ore you can get to progress through the first few hardmode tiers. Once you have your mythril/orichalcum pickaxe, you can go back and mine leftover cobalt for cosmetic items or extra gear if you want, but early on, every bit of ore counts.
It’s also worth noting that you can combine cobalt bars with other materials to make useful utility items later on, like the Cobalt Shield upgrade, or crafting station add-ons, so don’t throw away any extra ore you have left after your first crafts.
Mining cobalt is the very first step to unlocking all of hardmode’s best content, and it’s a lot simpler than most new players make it out to be. If you’re still stuck wondering how do you mine cobalt in Terraria, just stick to the steps we covered: smash at least one altar, grab your Molten Pickaxe, drink a Spelunker Potion, and dig in the middle of the Cavern layer. You’ll have your first stack of cobalt in no time, and you’ll be ready to take on the first hardmode bosses before you know it. Don’t get discouraged if you can’t find it right away—even experienced players spend a few minutes hunting for that first vein sometimes.