First of all:
Dence gold plate can be used same way, as a copper one.
I have a much trouble finding enough copper for my nuclear reactor.
Real thermonuclear reactors (so called Tokamak Reactor: http://en.wikipedia.org/wiki/Tokamak) maded with superconductive magnetic coils with toroidal channel, contain deuterium+tritium plasma. So we go same way.
Made iridium dust, that will needed to make superconductive alloy.
Superconductive alloy dust.
Superconductive alloy.
Superconductive cable.
Superconductive coil (Superconductive cable+tesla coil)
Thermonuclear reactor control core (generator+reactor plating+advanced circuit).
Each block of superconductive coil placed around control core. Reactor must work only if all 8 of coils placed in circle around conrol core.
Fuel for reactor is heavy water:
First all coolant cells, that exhausted their resource become a "radioactive water cell".
We make a one heavy water cell from each 8 radioactive water cell in extractor.
If anybody like to bring my ideas to game, i can make necessary pictures for that.