Iron (Civ3)

Iron
Introduced in Civilization III
Type	Strategic
Revealed by	Iron Working
Found in	Hills Mountains
Allows	Iron Works Coastal Fortress Factory Cannon Frigate Immortals Ironclad Knight Legionary Man-O-War Pikeman Privateer Rider Samurai Swordsman Railroad
Tile bonus	+1

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Iron is possibly the most critical resource in the game. It is required for factories and for your Workers to build railroads.

Civilopedia entry

When early civilizations began to use metal to construct tools and weapons, the most commonly used metal was bronze. Bronze had the advantage of being readily available and easy to work with. Unfortunately, it was too soft to hold an effective edge. In the mid-14th century BC in central Europe, iron replaced bronze as the metal of choice, and the Iron Age was begun. Since this time, iron has been a valuable commodity. Deposits of iron and iron ore found in mountains are mined and processed for use in their raw form, and in the production of steel.