...
I pulled up like 6 Saturday in Cove Fel alone, but that was really the exception more than the norm.
Usually I might get one every other mining run or so, so I don't have too many.
Oddly enough, I had better overall luck as even when blackrock elems WERE spawning, I think I got one or two the entire time I mined and got quite a few more small blackrocks without them spawning.
I guess I have better luck in the mining area than some others (i.e. artifact drops).