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Stardew Valley Heavy Furnace Unlock and Crafting
Unlock / Mining Mastery, 2 Furnaces, 3 Iron Bars, and 50 Stone
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.
Facts and route notes
Category: Unlock
Focus: Mining Mastery, 2 Furnaces, 3 Iron Bars, and 50 Stone
Checklist: Claim Mining Mastery before planning the recipe. Keep two ordinary Furnaces, 3 Iron Bars, and 50 Stone ready for each Heavy Furnace. Place the first Heavy Furnace beside ore and Coal storage so late-game mining dumps turn into bars quickly.
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