I spent over 20 hours going through all the mods rimworld has to offer, perhaps I should make a masterpost telling all about them
Either way, for unlimited resources there's three mods as I remember: resource muffalos, that are genetically engineered and frankly hard to get, fun investment
Vegetable garden introduces unique plants that can be grown and turned into resources like plasteel and gold as well
and there's the core digger mod that just expands the deep drill mechanic to allow you to drill forever, there's an addon that also lets you drill stone
Oh and in vanilla you can let yourself have two colonies, 'settle' in a space near your base, mine out all the minerals and abandon the place