Brisbane Times

A mining giant under investigation for exceeding lead emission levels at its Mount Isa plant has maintained it didn't breach safety standards.

Xstrata has until tomorrow to avoid prosecution after recording higher than allowed lead levels at the plant in Queensland's northwest.

One of the mine's five air sampling stations found lead levels exceeded regulatory limits during the final three months of last year.

A spokesman for Xstrata today said the company believed its readings were below the limit and there may have been a technical anomaly that contributed to the higher reading.

"We've got two other laboratories to analyse the data and both of them have come back and said that there was no (lead) exceedance which stacks up considering all other monitors showed no exceedance," he said.

A report into Xstrata's investigations will be handed to the Department of Environment and Resource Management tomorrow morning.

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