Heavy Furnace
| Heavy Furnace | |
|---|---|
 | |
| Type | Crafted Item |
| Recipe | Mining Mastery |
The Heavy Furnace is the bulk version of the Furnace, built for farms that smelt ore by the chestful. It swallows twenty-five pieces of ore at a time and returns five or six bars instead of five. It also burns far less Coal per bar. The recipe is one of the rewards of Mining Mastery, so it only arrives after every skill has reached level 10. For anyone still digging through the Skull Cavern late in the game, it stretches every load of ore and Coal further.
Recipe
The recipe is claimed in the Mastery Cave in Cindersap Forest, a hidden room below Leah's cottage. The door only opens once every skill is at level 10. After that, further experience fills a mastery bar instead of raising skills. The first mastery costs ten thousand points, and each one after costs more.
Mining Mastery has its own pillar in the cave. Claiming it unlocks the Heavy Furnace recipe, the Statue of the Dwarf King recipe and a bonus that doubles the gems from gem-bearing rocks. Since masteries are claimed one at a time, the order matters. A farm that smelts a lot gets the most from taking Mining early.
Building the Heavy Furnace takes two ordinary Furnaces, three Iron Bars and fifty Stone. The old Furnaces are used up in the recipe.
These are the ingredients one batch needs.
| Name | Image | Amount |
|---|---|---|
| Furnace | 
|
2 |
| Iron Bar | 
|
3 |
| Stone | 
|
50 |
Use
It works like a normal Furnace on a larger scale. Holding a stack of ore and using the machine loads twenty-five pieces, as long as three pieces of Coal are in the inventory. The smelting times match the regular Furnace, from a short wait for Copper to the long overnight run for Iridium.
The output is a coin flip between five and six bars. Five ordinary Furnace runs would use the same twenty-five ore but five pieces of Coal, and always return five bars. On average, the Heavy Furnace saves about a tenth of the ore and nearly half the Coal.
Quartz works too. Five Quartz turn into five or six Refined Quartz. Five Fire Quartz make a much larger pile, between fifteen and twenty pieces.
Notes
The savings matter most on expensive ores. An extra Iridium Bar or Radioactive Bar now and then adds up to a lot of gold over many batches. Coal saved also means fewer trips to the Mines or the Blacksmith for fuel.
It does not speed up smelting. A farm that needs bars quickly still gains from running several machines side by side.
All Crafting
Every entry in this group, with its key details.
