Replace ore with supply depot?

[Nighthawk]

But it's worth noting that those would be simple "money powerup" crates, not something that can be picked up and taken to a supply depot like Generals. If you take the ore-generating-structure route, then the 'crates' will appear in a slowly-increasing radius out from the structure for as long as the spawning animation keeps playing. I can't quite remember whether there's a way to limit the spreading distance or not.