NSW Environment Protection Authority

Mining company Rio Tinto has been fined only $50,000 over the collapse of a dam wall at its Mount Thorley Warkworth mine last year.

It is estimated that up to 4 megalitres of sediment-laden rainwater flowed into the Wallaby Scrub Road reserve from the dam. The company blamed the collapse on several days of continuous rain, which softened the dam’s earth wall. However the court found the event was not a major storm but "merely what is regarded as a one-in-two-year rain event". 

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