Iron in Valheim explained
Players will start to see the importance of Iron in Valheim after they craft Bronze tools and armour. After beating the first boss Eikthyr, players will receive the means to craft an Antler Pickaxe and with it, they can mine ores.
Found in The Black Forest biome, Tin and Copper are the first resources you can mine. When they are smelted and combined, they produce Bronze. Using a forge, you can melt Bronze to craft powerful weapons, tools and armour.
These items are sturdy and will serve you well up until you defeat the game's second boss The Elder, who is the overlord of The Black Forest biome.