Atomcraft Buried City Walkthrough: Lepidolite, Borax, and Deep Ores

Buried City is the deeper Atomcraft biome where mid-game chemistry becomes late-game ambition. Beneath limestone logic wait Lepidolite, Borax, Pyrolusite, Columbite, and the heat problems that make cooling and safe machines mandatory.

Prerequisites before Buried City

• Copper drill mastery and preferably higher hardness where required.
• Limestone supply lines already boringly reliable.
• Double-U forge capacity for parallel jobs.
• At least basic mechanical doors from Research Points.
• A quench or cooling plan from cooling and noble gases.
• Combat comfort with bats in tight geometry.

Skip ahead only if you enjoy rebuilding camps. Otherwise finish limestone caves first.

Signature Buried City materials

• Lepidolite — lithium-bearing ore used in multi-step salt chemistry.
• Borax — versatile mineral for advanced mixes and processing chains.
• Pyrolusite — manganese ore tied to high-temperature oxide work.
• Columbite — deeper metallic ore for specialized progression paths.

Exact recipes evolve with Atomcraft patches, but sourcing these four is the biome’s identity. Track them with Material Tracking sparkles so deep stone does not become a maze without payoff. Cross-check processing notes on the materials hub.

Shaft and base design for the deep

Buried City runs are longer. Atomcraft players should:

1. Extend a spine shaft with frequent clay airlocks.
2. Keep a forward cache for ore and a rear cache for restoration gases.
3. Separate hot experimental rooms from haul routes.
4. Preserve jetpack chimneys that never cross blast lanes.
5. Mark the limestone-to-Buried City transition so you can retreat under pressure.

Use the map mental model: deeper is not only “more stone,” it is a different palette of reagents and backgrounds.

Processing mindset

Lepidolite routes often involve acids and aqueous stages—temperature discipline matters. Community guidance frequently prefers charcoal heat over harsher fuel when acids threaten to evaporate. Pyrolusite combinations may demand staged high temperatures; build parallel forge bays rather than one overloaded pit. Read forge designs again with thicker walls in mind.

Blenders help force contact for stubborn mixes, but only inside timed cells from wiring and safe reactions.

Research Points from the deep

Buried City is a restoration goldmine if you haul smart. Diatomic forms still count. Every RP infusion unlocks more mechanical pixels, which makes deep logistics safer. Ship completion and Buried City digging should braid, not compete—see ship completion.

Threat model

• Longer falls and more complex rooms.
• Enemies interrupting precise pixel grabs.
• Heat from forward forges cooking wiring.
• Inventory chaos causing you to vent the wrong gas.

Atomcraft jetpacks mitigate falls; doors mitigate everything else.

Haul schedule example

1. Descend with empty specialty crates labeled for Lepidolite, Borax, Pyrolusite, Columbite.
2. Mine with Material Tracking focused on one ore per trip.
3. Ascend before crates become unsorted mountains.
4. Smelt or dissolve in camp cells, not at the ore face.
5. Deliver ship elements before the next descent.

When Buried City is “done enough”

You do not need to hollow the biome. You need stable access to the four headline ores, a cooling-capable camp, and enough RP to automate dangerous steps. Then shift emphasis toward ship completion while maintaining a supply spine.

Support links

Tools, drill tiers, guides, builds hub, and controls remain relevant. Buried City punishes players who treat Atomcraft like only a digging sim. Treat it like a supply chain with teeth.

Master this chapter and the ship finally feels finishable rather than mythical.

Forward camp versus main camp

Some Atomcraft players build a tiny forward forge in Buried City. That only works if charcoal, clay, and doors travel with you, and if energetic experiments stay banned from the forward hut. Prefer a forward cache for ores and a main-camp processing wing with cooling. Losing a forward hut to bats is annoying; losing your only lithium intermediate line is worse.

Sorting four ores without chaos

Label trips: one descent for Lepidolite, one for Borax, one for Pyrolusite, one for Columbite. Mixed crates create mis-crafts that waste sulfuric stages and furnace time. Material Tracking should match the label on the crate you carried down. When a sparkle color surprises you, pocket it separately rather than dumping it into the wrong Atomcraft production lane.