Refineries produce Iron using Labor. Each city can only have one Refinery, and it is unlocked from a level 6 Foundry.
It is worth noting that each upgrade has a labor cost, as well as quite a high resource cost. Iron is the most valuable resource in the game (apart from labor, maybe), and will be required to upgrade most structures past a certain level, so players should aim to get a Refinery when approaching mid-game.
Stats[]
All structure and unit stats, cost to upgrade per level, and other abilities can be seen on the Official Database Entry
Structures |
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Armory · Barrack · Basement · Blacksmith · Cannon Tower · Farm · Foundry Lumbermill · Lumbering Camp · Market · Refinery · Stable · Tower · Town Center |