Bloomery

A stone and clay stack where ore and charcoal burn together. This is where your first metal comes from.

Size	2 × 2 × 2 blocks
Max temperature	1300 °C
Heats / cools	1 °C per tick / 0.2 °C per tick
Fuels	900 to 1200 °C: logs, planks, charcoal, coal, coal block
Fuel lasts	75% of its normal burn time

How to build it

It needs a 2 × 2 × 2 space. Stone bricks and smooth stone both work for the bottom row, and both come from the Clay Kiln.

How to use it

Ore and fuel go in the same 3 × 3 grid, in any slot. Leave room for the fuel. Logs only reach 950 °C, which isn't enough for any ore here, so use charcoal or coal.

What it makes

	Iron with charcoal: a clean ingot.
	Iron with coal: an ingot plus 4 Sulfur Slag.
	Copper: 1085 °C.
	Gold: 1064 °C.

Each batch is 1 ore into 1 ingot and takes 10 s, and one charcoal or coal lasts for 6 batches. The time doesn't change with temperature: a hotter fire only reaches the minimum sooner.

After the fire goes out, the batch in progress keeps going for as long as the furnace stays hot enough.

The Bloomery also melts worn iron and gold gear: see Recycling. The next step is the Iron Furnace.