THE Olympic Dam mine is understood to have been shut down by an accident.

It is believed a major breakdown has blocked the mine, potentially creating signifant costs for operator BHP Billiton, AdelaideNow has reported.

A mine source has said no-one has been hurt.

The state Government is treating the situation as a major incident.  AdelaideNow reported earlier that it was understood the incident involved a haulage accident.

The Olympic dam mine produced uranium, copper and other minerals.

Follow breaking coverage of the incident at AdelaideNow.