If the mission is to mine Morkite, and you get more Morkite after meeting the quota - does that net gold, XP, or both? Is it reduced?
What about Nitra, in general? Does mining more give any benefit if you don't really need it for resupplys?
Bittergems only give XP and cannot be used in crafting, right? The same with the "error block" mineral?
What about for secondary objectives like Boolo cap? Does getting more get anything?