Worker bots and specialized roboportsWorkers bots which could harvest trees or ores, using pickaxes.
What ?The idea is to have a class of workers bots, working around a robotic mine (a specialized roboport) when harvesting ore or a around a lumber mill when harvesting wood.
The number of workers by mine would be limited by the mine tier, and the time to unload bots, by modules.
They would use pickaxes. Pickaxes could have some tiers too : wood and iron, wood and steel, plastic and steel. They would be out of use after a number of hits depending upon their tier ofc,like the old pickaxe. So you would need a supply of pickaxes to sustain a robotic mine/lumbermill.
Why ?So you can have automatic lumber jacks. And a way to get ore from small deposits, or even have a workers vehicle (mobile mine/harvester). (With the same look as the one in Command&Conquer? )
(English is not my primary language)