>>533669883
I'm guessing it recompacts when dumped.

I tried a quick test with some wedges, though not conclusive because dumped vs digged angle of repose is different. I have +50% ore yield and it doesn't look like I get +50% dumped out. I am guessing it recompacts because that makes sense. That implies you could get infinite ore by mining it to storages, changing the difficulty, and dumping at -75% ore yield, changing back to +50%, mining it back to storages, etc. That may be a simple way to test it accurately.

Also of interest, https://wiki.coigame.com/Designations
CopperOreDisrupted and CopperOre are different things which could be relevant.