It would be nice if there was a feature for vehicles such as clay collectors and wood bots to rebuild clay pits and especially fir trees once they deplete the source...its a pain to rebuild a whole forest of fir trees every ten minutes
For the trees, there is a tree farm that handles the wood resource for you. Nothing yet for the clay.
https://www.my-colony.com/reference/general.html?Type=Building&BuildingCategories=Resources#TreeFarm
Ultra deep dig site produces clay as well as alien artifacts.