Copper is one of the 31 Rare Resources in the game and available from the beginning. It appears as a patch of slightly shiny yellow-orange rocks with some green and grey sprinkled in. It bears some resemblance to the Amber resource. Like all rare resources on land, Copper can be obtained by sending a Merchant from the Market to the resource location. Copper provides the following benefits:Classical Age and linking a copper resource while still in the Ancient Age might provide no benefits to a nation at all.
Copper is especially valuable and sought after on all sea map types, improving the important naval units and making them much more durable in combat. Transport vessels like the Transport Barge are also affected by this resource, making them slightly less vulnerable.