Hi ! I'm Underground Biomes's dev.
Someone recently asked me to add support for your speleothems ( Aang23/UndergroundBiomesConstructs#30 ).
While doing that I obviously needed Quark in my dev environment, there was no issues whatsoever, until I noticed that vanilla ores actually stayed normal...
After some time, debugging and tests I realized that there was no issues without Quark.

That's why, before doing anything else, I would like to know if Quark affects Ore Gen by any means, as currently UBC relies on 1 event for it's whole thing.

Quark does not touch ore gen at all.