List of Metal Factories

Metal is an incredibly valuable resource for building factories, any buildings and Tanks and Airplanes. There are only five different factories that produce Metal, meaning it's hard to come by if you only want to get it through producing it. For those who don't, Temperate Terrorists and other missions exist where you get Tanks as a reward for completing the mission, that you can then disband for lots of Metal. The Stonesilver Quarry is technically the best factory for producing Metal, but Stonesilver is quite rare.
As of 2.2.1, there are 5 factories that produce Metal. All 5 are non-renewable. Iron Smelters and Bauxite Mines can be built at t2, Open-Pit Mines and Platinum Mines can be built at t3, and Stonesilver Quarries can be built at t4.
Input 	Output 	Cost 	Max Efficiency
Iron Smelter 	Iron Smelter 	Iron Smelter 	Iron Smelter
1 Iron
6 Money
11 Power	2 Metal 	8km2 Cleared Land
----
1,026 Money
535 Building Materials	140%
Bauxite Mine 	Bauxite Mine 	Bauxite Mine 	Bauxite Mine
1 Bauxite
6 Money
11 Power	2 Metal 	8km2 Cleared Land
----
1,026 Money
535 Building Materials	140%
Open-Pit Mine (Copper)	Open-Pit Mine (Copper)	Open-Pit Mine (Copper)	Open-Pit Mine (Copper)
1 Copper
8 Money
15 Power	4 Metal 	8km2 Cleared Land
----
1,390 Money
758 Building Materials	140%
Platinum Mine 	Platinum Mine 	Platinum Mine 	Platinum Mine
1 Platinum
8 Money
15 Power	4 Metal 	8km2 Cleared Land
----
1,390 Money
758 Building Materials	140%
Stonesilver Quarry 	Stonesilver Quarry 	Stonesilver Quarry 	Stonesilver Quarry
1 Stonesilver
19 Money
37 Power	15 Building Materials
20 Metal
6 Consumer Goods	5km2 Cleared Land
----
2,493 Money
1,870 Building Materials
935 Metal	**
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