If you’ve spent any time exploring the sun-scorched badlands of Borderlands 4’s new planet, Kratos-7, you’ve probably spotted the rusted entrance of the abandoned auger mine borderlands 4 hints at in the early “Missing Miners” side quest. Most players walk right past it, writing it off as another generic bandit-infested cave with nothing useful inside. But that’s a huge mistake. This unassuming mining site is packed with exclusive legendary gear, hidden lore easter eggs, and a fun optional boss that drops one of the best mid-game assault rifles in the entire game. I’ve run this mine at least 20 times across three different character playthroughs, so I can confirm all these tips work for every class from Siren to Beastmaster, no matter your playstyle.
Key Locations to Explore in the Abandoned Auger Mine Borderlands 4 Hides Off the Main Path
The mine’s layout is deceptively large, with multiple levels and hidden nooks most players miss on their first run. The first thing you want to do when you arrive is grab the static field keycard off the dead Crimson Raider corpse propped against the entrance sign. A lot of players run right past this, and end up stuck when they hit locked doors deeper in the mine, wasting 10 minutes running back out to grab it. If you’re the type of player who loves hunting for hidden content, the abandoned auger mine borderlands 4 added in the base game has more than enough secrets to keep you busy for an hour or two.
There are three unmissable spots you need to hit during every run:
- The raider camp on the upper ledge of the entrance: holds a guaranteed rare weapon crate that refreshes every time you fast travel away and back, making it a great spot to grab early game upgrades for new characters
- The flooded lower tunnel: you’ll need a radiation-resistant mod to explore it without taking constant damage, but it hides a secret lore log that unlocks a hidden side quest with a unique class mod reward
- The core drilling chamber control room: the wall behind the broken control panel hides a secret room with three Eridian chests that only open once per playthrough, so don’t forget to check back when you start a new run
You’ll also find small piles of Eridium scattered across the mine, usually tucked behind broken conveyor belts or old mining equipment. I usually walk away with 15 to 20 Eridium per full run, which adds up fast if you’re trying to unlock slot machine upgrades or cosmetic skins at the main hub.
Exclusive Loot Drops You Can Only Get From the Abandoned Auger Mine
Unlike most generic side locations, the abandoned auger mine borderlands 4 built has exclusive loot you won’t find anywhere else in the game. The most sought-after drop is the Auger Bite legendary assault rifle, a 3-round burst corrosive weapon that drills through up to 5 enemies at once and leaves a stacking damage over time effect that melts armored foes. It’s one of the best mid-game weapons for Mayhem 5 to 8 runs, and it works perfectly for both solo and co-op play.
You also have a chance to get the Miner’s Luck class mod from regular bandit and skag enemies inside the mine. This mod increases all loot drop quality by 18% when you’re in underground areas, which makes it a must-have for anyone who loves farming caves, bunkers, and other hidden locations across Kratos-7. The drop rate for this mod is around 10% on Normal difficulty, so you’ll probably find one after 2 or 3 full runs through the mine.
The mine also has a 30% higher spawn rate for anointed gear than most other open-world locations, so it’s a great spot to farm for general upgrades if you’re stuck on a main story mission. If you crank the difficulty up to Mayhem 10, the drop rate for both the Auger Bite and Miner’s Luck mod jumps by 40%, so it’s worth turning up the difficulty if you’re specifically farming for these items.
How to Beat the Abandoned Auger Mine’s Optional Boss, Drill Sergeant Grit
The boss you’ll fight in the abandoned auger mine borderlands 4 players jokingly call “Drill Bob” (his official name is Drill Sergeant Grit) is one of the most fun optional fights in the early game. He’s a former Tediore foreman who got left behind when the mine was shut down, mutated by radiation, and now controls all the bandit and skag packs inside the site. His fight is fairly straightforward if you know his weaknesses, but it’s easy to get overwhelmed if you go in blind.
First, leave all your fire weapons at home. Grit has thick armored plating that’s completely resistant to fire damage, so you’re just wasting ammo if you bring fire guns. Corrosive damage melts his armor in seconds, and shock damage takes down his large blue shield almost instantly, so stick to those two damage types for the fastest clear. The arena is the core drilling chamber, so there are plenty of thick concrete pillars to hide behind when he throws explosive drill bits, but don’t hide behind thin metal sheets—his drill attacks go right through them.
His biggest weak point is the exposed radiation core on his back, so try to circle around him as much as possible to land critical hits. A single critical shot to the core stuns him for 3 full seconds, letting you unload as much damage as you want without him fighting back. When he drops to 25% health, he’ll call in 3 large skag packs, so clear those first before you focus back on him. If you try to keep attacking Grit while the skags are alive, you’ll get swarmed and die in seconds, even if you have a huge health pool.
If you beat him without taking any damage, you’ll get an extra Eridian chest as a bonus reward, which has a 70% chance to drop the Auger Bite assault rifle. I’ve gotten the rifle 3 times this way, so it’s worth taking the time to play carefully if you’re farming for it.
Common Mistakes to Avoid When Exploring the Mine
After running this mine so many times, I’ve seen a lot of players make the same avoidable mistakes that cost them time and rare loot. The most common one is skipping the static field keycard at the entrance, as I mentioned earlier. You won’t be able to get into the core chamber or the secret loot room without it, so don’t run past the dead raider at the start.
Another big mistake is forgetting to bring a radiation-resistant mod before you head into the lower tunnels. The flooded section has permanent radiation that drains 5% of your health per second, so even if you have a maxed-out health pool, you’ll die before you reach the secret lore log. You can buy a cheap radiation mod from the vending machine right outside the mine entrance for 1,000 cash, so there’s no excuse for skipping it.
A lot of players also waste time farming the boss on low difficulty. The drop rate for the Auger Bite is only 5% on Normal mode, so you could run the fight 20 times and still not get it. Crank the difficulty up to Mayhem 5 at minimum, and you’ll cut your farm time in half at least. Playing in co-op also helps, because the boss drops two extra items when you’re in a full 4-player group, and the number of loot chests across the mine doubles.
If you accidentally trigger the boss fight before you’re ready, don’t panic. You can run out of the core chamber and all the way back to the mine entrance to reset the fight with no penalty, as long as you get far enough away that Grit de-aggros. I’ve done this dozens of times when I forgot to swap to my corrosive weapons before walking into the chamber.
At the end of the day, the abandoned auger mine borderlands 4 players often overlook is one of the most rewarding open-world side locations in the entire base game. Even if you don’t care about the exclusive legendary weapons, the hidden lore logs give a ton of context for Kratos-7’s mining history and the ongoing conflict between Tediore and the Crimson Raiders. It only takes 30 to 45 minutes to fully explore, so drop by the next time you’re wandering the badlands, even if it’s just to grab the Miner’s Luck mod to make all your future loot runs easier.