We know that some new resources like naquadah or uranium will be added, but what about basic materials?
My Ideas would be:
Copper: needed in order to make low-energy cables. I personally don´t like the Idea of transferring electicity through a small layer of redstone dust as it is described in the (outdated) Summary of FC
Bauxite: you make aluminium out of it, you know, that thing you can use for quite any contruction
Tungsten: used to improve steel even more (less demage by energy weapons) by putting both into a smelter
Tin: I have no Idea what to use it for. Military rations in tin cans maybe?
Platimum: computers? maybe?
Titanium: armor
Palladium: something like the ARC reactor from Iron Man?
Iridium: nuclear fuel rods (jacket)
Arsenic: chem. weapons