A NSW coal mine has been fined $30,000 after a local creek was polluted by uncontained sediment and soil.
The NSW Environment Protection Authority says that on February 8 the Tarrawonga mine near Boggabri discharged sediment from a dam after heavy rain, in excess of their licence discharge limits.
The mine also failed to dewater a sediment pond within the required five-day management period after the previous rainfall event, the EPA said.
The dam discharges to the nearby Goonbri Creek.
The mine has been fined $15,000 for the pollution of waters and $15,000 for failing to operate plant and equipment in a proper and efficient manner.
EPA regulatory operations manager Lindsay Fulloon said it was important for mines to maintain sediment dams and drainage to properly capture and treat wastewater from the mine, to protect the surrounding environment.
"This includes treating and removing water captured within sediment dams promptly so that they have capacity to capture runoff from forecast rainfall events across the year," he said in a statement on Wednesday.
"Mine records indicated that de-watering of the sediment dam had not been done since May 2019, despite significant rainfall after that date."
The Tarrawonga open-cut mine is owned by Whitehaven Coal.