Mining Mastery, 25 ore batches, Coal savings, Quartz refining, and Skull Cavern bars
Stardew Valley Heavy Furnace Guide
Heavy Furnace turns Mining Mastery into a real production upgrade. Batch 25 ore with 3 Coal for 5-6 bars, use Quartz and Fire Quartz for Refined Quartz bursts, and build a furnace lane that supports Skull Cavern, Radioactive Ore, and late-game crafting without drowning the farm in single-bar chores.
25
ore per batch
3
Coal per run
5-6
bars output
The recipe unlocks from Mining Mastery and uses 2 Furnaces, 3 Iron Bars, and 50 Stone.
Ore batches consume 25 ore and 3 Coal, then output either 5 or 6 bars.
Average savings are about 9% ore and 45% Coal compared with ordinary Furnaces.
Heavy Furnace route modules
6 guidesUnlock / Mining Mastery, 2 Furnaces, 3 Iron Bars, and 50 Stone
Heavy Furnace Unlock and Crafting
重型熔炉解锁与制作
Heavy Furnace unlocks from Mining Mastery and is crafted with 2 Furnaces, 3 Iron Bars, and 50 Stone. Build it once the save has enough ore flow to process full 25-ore batches instead of one bar at a time.
Mechanics / 25 ore, 3 Coal, and 5-6 bars
25 Ore Batch Smelting Rules
25 个矿石批量冶炼规则
For ore, Heavy Furnace consumes 25 ore and 3 Coal per run. Each batch has an equal chance to output 5 or 6 bars, so the average batch beats five ordinary furnace runs on both ore and Coal.
Efficiency / Average 9% ore savings and 45% Coal savings
Ore and Coal Economy
矿石与煤炭经济
Compared with ordinary Furnaces, Heavy Furnace saves about 9% ore and 45% Coal on average when smelting bars. That makes it strongest for Iridium, Radioactive, and other high-volume mining routes.
Refining / 5 Quartz or 5 Fire Quartz plus 3 Coal
Quartz and Fire Quartz Refining
石英与火水晶精炼
Heavy Furnace can also run 5 Quartz or 5 Fire Quartz with 3 Coal. Quartz yields 5-6 Refined Quartz, while Fire Quartz yields 15-20 Refined Quartz for sprinkler, crystal path, and crafting stockpiles.
Layout / Ore chest, Coal chest, regular Furnaces, and Heavy Furnace lanes
Furnace Lane Layout and Throughput
熔炉动线与吞吐
The cleanest layout keeps Heavy Furnaces beside ore and Coal chests, with ordinary Furnaces beside them for leftover stacks. This makes morning pickup, late-night dump, and shed-based bar production easier to repeat.
Late Game / Iridium, Radioactive Ore, Mining Mastery, and Dwarf King powers
Skull Cavern and Radioactive Ore Planning
头骨山洞与放射性矿规划
Heavy Furnace turns deep mining days into efficient bar production. Use it after Skull Cavern Iridium dives, dangerous mine Radioactive Ore weeks, and Dwarf King ore or coal power days to compress late-game crafting costs.
Batch inputs
25 + 3 Coal
Copper Ore
5-6 Copper Bars
Bulk process early ore for tappers, machines, and basic crafting once batches are available.
25 + 3 Coal
Iron Ore
5-6 Iron Bars
Excellent for kegs, quality sprinklers, tappers, bee houses, and machine-heavy farms.
25 + 3 Coal
Gold Ore
5-6 Gold Bars
Use for tool upgrades, quality sprinklers, crystalariums, and mid-game crafting pressure.
25 + 3 Coal
Iridium Ore
5-6 Iridium Bars
The premium batch target after Skull Cavern dives because every saved ore and Coal matters.
25 + 3 Coal
Radioactive Ore
5-6 Radioactive Bars
Plan around dangerous mine weeks and Qi routes, then batch before late-game recipes need bars.
5 + 3 Coal
Quartz
5-6 Refined Quartz
Steady Refined Quartz source for sprinklers, Lightning Rods, crystal paths, and crafting cleanup.
5 + 3 Coal
Fire Quartz
15-20 Refined Quartz
High-output Refined Quartz burst; save it when the farm needs a large crafting stockpile.
Layout patterns
Ore chest lane
Place Copper, Iron, Gold, Iridium, Radioactive Ore, Quartz, and Coal chests beside Heavy Furnaces for fast batch starts.
Mixed furnace line
Keep ordinary Furnaces beside Heavy Furnaces so under-25 leftovers can still become bars.
Skull Cavern dump chest
Use a labeled chest near the farm return point for Iridium Ore, Omni Geodes, coal, bombs, and staircases.
Volcano and island bin
Separate Cinder Shards, Dragon Teeth, Fire Quartz, and island loot from normal mine ore to reduce sorting drag.
Late-game shed
Move heavy refining into a shed once outdoor machine lanes compete with barns, crops, and artisan layouts.
Heavy Furnace planning loop
Step 1
Claim Mining Mastery.
Step 2
Craft with ordinary Furnaces, Iron Bars, and Stone.
Step 3
Sort full 25-ore batches beside Coal.
Step 4
Run leftovers through regular Furnaces.