Lava-Powered Factory in Sandustry

Portable lava is the difference between a factory that runs while you sleep and one that demands constant flamethrower patrols. The Lava → Scoria → Cinder → Flamethrower cycle turns a cave resource into a burn lane you can place anywhere on the map. Once you have a Cinder supply, slag slides into lava and your Kinetic Slag Press never starves. Flowers that need burning — Amethelis for the Flux Emanator — also eat lava heat automatically. This guide builds the full portable heat infrastructure: mining, logistics, and the two systems that benefit most.

Prerequisites

Before building a lava factory you need:

• Tools 3 — Cryoblaster to freeze lava into Scoria
• Guns research — Rocket Launcher or equivalent explosive to shatter Scoria into Cinder
• Tools 1 — Flamethrower to remelt Cinder into lava
• Refining 2 — Kinetic Slag Press for the downstream gold payoff
• Stable gold income from surface or mid-level shakers

If you are still feeding manual shakers, finish How to Get Gold first. Lava logistics is mid-game infrastructure, not a starter tool.

Best factory builder of 2026 - Sandustry lava setup

The Scoria-to-Cinder chain

The full heat-relocation cycle:

1. Find lava — deep lava caves under Sandsoil and RedSand terrain. Look for orange flowing pixels below depth 20–30 tiles.
2. Freeze with Cryoblaster — spray ice at a lava tongue until it solidifies into Scoria. Scoria is a solid block you can mine and transport.
3. Blast into Cinder — use the Rocket Launcher or other explosive on Scoria. Each blast converts solid Scoria into Cinder powder.
4. Collect Cinder — Vacuum, Grabber, or Hauler Drones carry Cinder. Cinder floats on water, so collection near aquifers is safe.
5. Remelt with Flamethrower — ignite Cinder filters or spread Cinder across a burn lane to produce lava.
6. Contain the lava — lava leaks through gaps. Wall burn lanes with blocks or use filter beds that trap liquid lava.

This cycle costs tools and research but produces an indefinitely sustainable heat source that does not need you standing there with a flamethrower.

Building a lava slag burn lane

The primary use for portable lava is an automatic slag burner. Place it downstream of your shaker line:

Layout pattern:

1. Cinder filters — set Filters to allow Cinder only. Fill with your hauled Cinder supply.
2. Ignition — use the Flamethrower on the Cinder pile once to ignite it. The Cinder converts to lava and stays liquid inside the filter.
3. Slag drop — route Slag from shakers directly onto the lava pool. Lava burns Slag into Burnt Slag automatically.
4. Collection — Burnt Slag falls through or beside the pool onto a conveyor heading to the Kinetic Slag Press.
5. Gold from press — each clean press hit on Burnt Slag produces gold and Spores for your flower line.

Why this beats manual flamethrower:

• No player present during burn — you can explore, research, or build while slag processes
• Consistent burn temperature means steady throughput
• Scalable: add parallel burn lanes as shaker count grows

See Slag Processing for the press mechanics and Lava, Scoria, and Cinder for density and filter details.

Lava for flower automation

The Amethelis flower loop needs heat to burn petals into Voidbloom for the Flux Emanator. If you already have a lava burn lane, you can route flowers onto a secondary lava pit that burns them automatically — no Vacuum babysitting.

Setup:

1. Place a lava pit adjacent to your planter boxes (Flowers and Planters)
2. Route flower waste or trimmed Amethelis onto the lava surface
3. The lava burns petals into Voidbloom as they land
4. Route Voidbloom to your single Flux Emanator
5. Harvest Fluxite growing below the Emanator tile

This is the most hands-off Fluxite income path. Once the lava pit and planter boxes are stable, the whole Amethelis → Voidbloom → Fluxite chain runs without you.

Cinder logistics at scale

Moving Cinder is easier than moving lava, but the logistics still need planning:

• Belt vs drone — Cinder is launchable and belt-compatible. Short distances use conveyors; long distances from deep caves use Hauler Drones.
• Storage buffer — keep a chest of Cinder above each burn lane. Refill from your main Cinder stockpile when the burner runs low.
• Float warning — Cinder floats on water. If your factory sits over an aquifer, catch Cinder before it drifts into water tiles and gets lost.
• Density sorting — Cinder at density 50 sits near Burnt Slag. Use allow Cinder filters to separate it from other solids on shared belts.

Water and lava safety

Lava and water do not mix — they produce steam explosions that delete both resources and damage nearby structures. Keep burn lanes dry:

• No pipes or vents carrying water within three tiles of an open lava pit
• Roof over lava pits in areas with rain or steam from other processes
• Use Pumps and Vents to drain accidental water ingress before it hits lava
• If rain is killing your pits, build the burn hall underground or add a solid ceiling

Read Water Management for pipe routing and water control.

Deep lava mining strategy

The best lava caves are deep. To mine efficiently:

1. Dig a vertical shaft to the lava layer (depth varies by seed)
2. Place Lights so you can see the lava surface — frozen Scoria is easier to identify than flowing lava in dark tunnels
3. Freeze a working face of lava into Scoria with the Cryoblaster
4. Blast Scoria into Cinder, collect into bins
5. Haul bins upward with Launchers or drones
6. Store Cinder in a chest above your burn hall

Grappling Hook and Hover (from Fluxite upgrades) make the commute faster. See Fluxite Upgrades for the purchase order.

Troubleshooting lava burn lanes

Problem	Cause	Fix
Lava evaporates	Water or steam contact	Drain nearby water; roof the pit
Slag not burning	Lava pool too small	Add more Cinder; widen the burn lane
Cinder drifting away	Water nearby; no containment	Catch in dry area; wall the perimeter
Press running dry	Burn lane starved	Check Cinder supply; add buffer chest

Upgrade path summary

1. Unlock Tools 3 and a gun → Cryoblaster and Rocket Launcher
2. Find and freeze a lava cave face → Scoria stockpile
3. Blast Scoria → Cinder, haul to factory
4. Build first Cinder burn lane → automatic slag burner
5. Add second pit for flower burning → Amethelis → Voidbloom → Fluxite
6. Scale with parallel burn lanes as gold income grows

A lava-powered factory is mid-game ambition. Once the heat loop is running, your shakers and press produce gold around the clock without manual fire duty.

Related

• Lava, Scoria, and Cinder — Material densities and the full conversion chain
• Slag Processing — Burn lanes and the Kinetic Slag Press
• Flux Emanator — Fluxite growing mechanics
• Flowers and Planters — Amethelis farming and Voidbloom production