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Copper can be refined into Copper Alloy, which is used in the prototyping process for vehicles.
In-game description

Copper is a raw resource in Foxhole used to progress your Faction's Technology research.


It can be obtained by mining Salvage nodes on a Salvage Field where it occasionally spawns when a mined Salvage node splits. Note that you usually get a bigger Copper node from the first Salvage node split.

Copper only starts spawning after Harvester Technology is unlocked. A harvester isn't required to mine it, a Hammer or Sledge Hammer will do.


Copper can be refined into Copper Alloy in a Refinery. Copper Alloy in turn can be used at an Engineering Center to research advanced vehicle Prototype Kits.