In the the Space Exploration overhaul mod I once played for Factorio, at one stage the game progressed to the point that many/most resources could be converted into matter.

This matter could be transported from A to B.

And at the destination, this matter could be converted back into resources.

Mine uranium and/or copper and turn them into generic matter? Sure, why not.

Turn that matter into iron somewhere else? Of course!

And since matter could be transported in pipelines, it was just one tube for ~everything at that point. Some processes put matter into the tube, and some other processes took matter out of that same tube.

(It was very energy-intensive to make these conversions, but an intense amount of electrical power was also a solved problem by that point in the game.)