I'm just here looking for an answer too after trying to vent my asteroid base but I did go through the ART files and noticed something. While my asteroids list as 0/0 Rock resource (as well as all others), looking at the detailed resources they are listed as 0.0001/0, which is the same as what is listed in the config file (asteroid.cfg) in the ART install file. Maybe that is how it is supposed to be but changing that number does nothing, then I realized that with other modifications to asteroids in other mods I've looked at, once the asteroid is outfitted with resources, that change is permanent...? I have a backup so its no worries, just trying to help if that information is at all any help. I also installed AMT as you said, it didn't change anything. The config file for the latest AMT version, or anywhere else in the mod, has anything listed at all about a Rock resource. Anyway, have happy holidays everyone. Goodluck figuring this out!