Magellan Metals says laboratory tests have shown traces of lead detected within sealed containers bound for Freemantle Port did not exceed the legal limit.
The mining company transports lead from its Wiluna mine to Fremantle in double lined bags.
Last month the State Government banned Magellan from exporting lead from the port until it fully investigated the possible contamination.
Last week the company stopped operations at the mine until the report on the possible contamination was completed.
Magellan says air tests have found less than the baseline limit of 20 micrograms of lead per cubic metre were leaked inside the containers sent from its Wiluna lead mine in the Northern Goldfields.
It’s not the first time the company has been in this situation, as they were stopped from exporting from Esperance in 2008 after lead contamination was revealed in parts of the town.