BHP Billiton has claimed a West Australian record for the biggest open cut mine blast after detonating 11 million-tonnes of iron ore at its Jimblebar mine.

More than 50 hectares of ground at the Pilbara mine was set off with more than 6,400 detonators.

A video of the explosion shows the enormity of the blast.

"Drilling and blasting is a normal part of Jimblebar's operations," the miner said.