Stormbuilder

It's actually on the border between the Great Flats and the Lowlands. There's a slight terrain slope, but it's fairly consistent, so it looks like a flat. Between the two biomes, I have access to almost every resource in decent abundance, except for Water and Metallic Ore.

I found the reason!!! Apparently, a base can only be on one biome, as far as drilling for resources is concerned. So even if physically the drill is on another biome, it will still think it's on the base's one (I assume the main biome is where the first piece was landed, or maybe where the centre of gravity is). The moment I unlinked the vessel with the drill from the main base, it started properly drilling again.

I think you are probably right. Though weirdly, if you open the save file with Notepad++, it says that the version is 1.2.2 (versionFull = 1.2.2.1622 (WindowsPlayer x64))

Wait, so you are using 1.3 or 1.2.2? This save should be 1.2.2 --- If you right click on KSP in your library, do Properties, then Betas, you can select 1.2.2 Once you've done it, any further update of KSP won't automatically execute. I assume that once you've done it, you also need to stop updating mods installed via CKAN, otherwise they will get updated to a version incompatible with old KSP.

Damn, that's a shame. It might be because steam updated to 1.3, and I later reverted it back to 1.2.2

The non-USI elements of the base are: 2 objects from the OSE workshop mod (not sure if I installed that via CKAN or not). One that is a workshop, and the other one converts ore to materialkits and dirt to rare stuff The white tanks are procedural items...not sure which mod they come from. It' one that allows procedural containers, SRBs, etc. And there are some surface package experiments inside one of the KIS containers

Honestly, way too many. I don't expect you to throw that time away for a random stranger on the internet, but if you feel like it, these are the screenshots of the installed mods:

Thanks! This is still with KSP 1.2.2. Appreciate the offer! Save file is attached. Loads of mods included, I am afraid. https://drive.google.com/open?id=0B4rx5tzOidqDb2JNenJEWjlUVE0

Sure thing. On next reload of the base, the "zero efficiency" became "nothing to harvest" Drill results and surface scanner showing that there should be resources there. And yes, my base is a complete chaos, but I am too ignorant of the mod to make it both functional and pretty within a career game

Hi all! Great mod, I love working on slowly colonizing Minmus. I run into 2 issues however: 1) I have a drill for gypsum and silicates where as it is drilling, it shows positive rate / second, but it says "zero efficiency". Why is that? 2) I have other drills where even though both the narrow band and the surface scanner say that the resource I want to harvest exists, the drill says "nothing to harvest" Any help would be appreciated Otherwise I am stuck sifting through dirt.