All trades in OZ Minerals Ltd. (OZL.AU) at 1023-1024 AEST (0023-0024 GMT) are under review after the stock dropped 87% in less than a second, the Australian Securities Exchange said Wednesday.

Market data shows a series of trades going through at between A$1.55 a share and A$1.70 a share at the time, against a more typical price of just under A$12.00 a share.

Stock in the copper-gold miner fell from A$11.63 a share at 1024.02 AEST to A$1.55 less than a second later, before climbing back to its former level in less than a minute.

Another trade at A$1.55 was seen at 1023.49 AEST, along with several other trades below the stock's typical trading level. Market data shows around A$74,000 worth of stock changing hands at the unusually low price, worth around A$570,000 at more typical prices.

Monday, shares in Rio Tinto Ltd. (RIO.AU) were cancelled after the Australian listing of the company lost 98% in a matter of minutes due to a trader error.

-By David Fickling, Dow Jones Newswires; +61 2 8272 4689; david.fickling@dowjones.com

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