As title reads, I caught my character gathering an invisible rich ghost iron deposit.
It was not visible in minimap with track minerals, and it was not visible on screen when it was being gathered.
I shut down the bot right away, of course, and as of yet, (this was about an hour ago) I haven't been banned.
I suppose my ui could have been slow, but just to be sure, has anyone experienced, or heard of, blizzard utilizing "honey pots" like this to catch botters?