The Darwin Port Corporation is facing prosecution for a copper concentrate spill last year.
Court documents will be filed today after 12 months of investigation into the incident, according to the NT News.
The spill occurred during copper concentrate load operations on ANZAC day, 2010.
Estimates put the potential spillage levels at around 20 tonnes.
Following a report by the NT News into high levels of copper concentrate washing into Darwin’s harbour, environment minister Karl Hampton launched an investigation.
While inspectors found a red substance in the port at the time, it was not linked to the copper spill.
Northern Territory miner GEMCO also came under investigation around the same time after an accidental spill of manganese iron ore from its port facility.
Despite a lag between the incident and notifying environmental authorities, “GEMCO immediately reacted and they put a container under the conveyor belt and also they dredged the area where the manganese was dumped into the sea,” NT resources minister Kon Vatskalis said at the time.