When mining and you fill all 6 slots, you can't keep mining
Example:
Slot 1 nullifier
Slot 2 shield
Slot 3 through 6 , each individual equals less than 100 minerals
once theres something in all 6 slots, you cant keep filling the miner, even if you only have 5 of each min, still, no more room
( I don't know why but im gonna guess mining is kinda ghostly, taking up a spot, once minerals on board, they stack, but if no empty spot, cant load minerals to stack Dx
as in, loading mineral X, not loading mineral Yellow Blue Red or Green, its as if when mining its loading mineral X, so once something in each slot, since there is no mineral X, you cant keep mining Dx )