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Grid Steel Pickaxe.png












The crucible is used for smelting Ores, to catch liquid Pig Iron that is smelted in a Blast Furnace, and as a device for mixing Alloys. It can also be picked up with a pickaxe, and moved around while retaining its contents. The maximum capacity of the crucible is 30 ingots worth of metal (3,000 units). The crucible will refuse to melt an item that would cause an overflow.

Making the Crucible

Fire Clay

Fire Clay is crafted with Clay, Kaolinite Powder, and Graphite Powder.

Kaolinite Powder Graphite Powder Kaolinite Powder Grid layout Arrow (small).png Fire Clay
Graphite Powder Clay Graphite Powder
Kaolinite Powder Graphite Powder Kaolinite Powder


Right-click a stack of 5 or more Fire Clay to open the interface and make the following pattern:

CFL Fire CFD Fire CFD Fire CFD Fire CFL Fire title= Crucible
CFL Fire CFD Fire CFD Fire CFD Fire CFL Fire
CFL Fire CFD Fire CFD Fire CFD Fire CFL Fire
CFL Fire CFD Fire CFD Fire CFD Fire CFL Fire
CFL Fire CFL Fire CFL Fire CFL Fire CFL Fire

Using the Crucible

  1. Input Slot - Input Slot for Ores, Ingots, Unshaped Metal or Anvils.
  2. Output Slot - Input Slot for Ceramic Molds to fill with liquid metal.
  3. Temperature Gauge - An estimate of the current temperature of the crucible.
  4. Volume Gauge - An estimate of how much liquid metal is in the crucible.
  5. Status Box - Lists the current liquid alloy/metal inside the crucible, along with it's components and their percentages.

On the Forge


In order to heat a Crucible, it must be placed on a lit forge. Place it by shift-right clicking on top of the forge block. There will still be a small area around the bottom of the crucible where you can access the forge to add more fuel. Crucibles do not block the airflow of a Bellows.

Smelting Ores

Place the ore you wish to smelt in the Input Slot(1). Once the crucible is hot enough, the ore will melt and the Status Box(5) will display the resulting metal. The Volume Gauge(4) will also increase. Note: Ingots, Unshaped Metal, Anvils, Sheets, Double Sheets, Wrought Iron Knife Blades, and unfinished armor can also be melted in this way.

Place a Ceramic Mold in the Output Slot(2) to retrieve your liquid metal.

Mixing Alloys

A combination of metals can be put into the crucible to make alloys. Note: Liquid Unshaped Metals pour slowly into the crucible instead of all at once, for more precise mixing of alloys. As items are melted, the Volume Gauge(4) will increase, and the Status Box(5) will change to display the current percentages, and the name of the alloy when the percentages are within the needed range. Once the name of the desired alloy appears, it can be removed by placing a Ceramic Mold in the Output Slot(2).

An example of mixing Bronze:


An Unknown combination of metals will result in Unknown Metal being displayed at the top, and if poured into a ceramic mold, will make a useless unknown ingot.

With the Blast Furnace

Two crucibles are needed to create a working Blast Furnace. One is used in the crafting of the Blast Furnace block, and the second is placed underneath the Blast Furnace block to catch the smelted Pig Iron.

Wrought Iron Double Sheet Wrought Iron Double Sheet Wrought Iron Double Sheet Grid layout Arrow (small).png Blast Furnace
Wrought Iron Double Sheet Crucible Wrought Iron Double Sheet
Wrought Iron Double Sheet Wrought Iron Double Sheet Wrought Iron Double Sheet
77.0Added the Crucible. Any metal can be smelted except for iron ore.
77.10Anvils can be properly smelted and recycled in a crucible.
79.0Single and double metal sheets can now be recycled in the crucible.
A stack of items can now go into the input slot.
79.12The bottom of the crucible hitbox was adjusted to allow for easy access to the forge.
79.18The crucible input slot no longer accepts refined blooms larger than 100 units, or raw blooms of any size.
79.19Empty crucibles will now say "Empty" instead of "Unknown"
?When materials melt inside a crucible, it cools down based on the materials added instead of a set percentage each time.
80.20Adding an alloy item (ingot, armor, etc.) to a crucible with an existing mixture of the same alloy no longer results in unknown metal.
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