Refining alloy materials

How do you turn your base alloys such as tungsten, aluminium and uranium into refined alloys

With the furnace.
There just some controlpoints where you can build one. When you hover over a controlpoint you can See which special structure can be build there.

Or look at gysberts map:

C=Chemical lab
F=furnace
D=drill

Pick the ressources like uranium and place them into the furnaces inventory, then start it. You’ll need to defend it against hordes of machines then… And don’t forget to release the heat/pressure from time to time.
You can pick up refined materials as soon as they are finished and of course after you beat the defense mission.

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