Copper

is one of the resources in Astroneer. Copper is refined from Malachite in a Smelter.

Stacks of copper can be found in derelict spaceships and as the result of researching artifacts types you already researched at least once.

Use
Copper is used to craft the following modules and items :
 * Printer
 * Generators
 * Crane
 * Drill Head
 * Spaceship