The CME says the large drop in gold prices in seconds wasn’t a mistaken trade, according to Dow Jones. The $30 came as 11,000 contracts were traded in one minute or about 10% of the average daily volume.
I’m not really sure how the CME can make a blanket statement like that. I can guarantee it’s a ‘mistake’ because selling slowly would have gotten a much better price for whoever was dumping gold futures.