I have a workerbot who must destroy rocks and recover stone and iron. I can not make it work
Rather than training your bots to work on rocks or boulders to recover stores and iron, you should train them to take a pickaxe to work on the grey areas called "metal deposits". They will then dig up both stones and metal ore. The metal ore can be combined with charcoal in a clay furnace to make metal, which then can be used for making metal plates, metal poles, metal gears, and then making steambots.