Is Mythic Chance 0,0007% Per Mob Or Per Item?

Does anyone know if...
Is 0,0007% the chance of a mob dropping a mythic or the chance of a dropped item being mythic?

 

It should be per item.
@Selvut283 please confirm

 

per item dropped

 

IIRC, Salted said it's a 0.0007% chance that a Mythic drops in general, but that may be my memory

 

Yes, my problem is understanding what he meant by 0.0007%, even in general (unless if by "in general" you mean "when a mob is killed it has a general 0.0007% chance of dropping a mythic").
The point was if the 0.0007% chance is triggered when a mob is killed OR when an item is dropped, and if an item, I assume emeralds doesn't count?

 

when I said "in general" I meant as in whenever a mob is killed. Again, that may be incorrect, but that's what I remember. Best to ask a mod in PMs.