We all know what it's like to drop some loose change from our wallet or purse.

But what if you accidentally dumped 172 gold bars on the ground?

Just ask Russia's Nimbus Airlines.

A flight was scheduled to transport a valuable cargo of nine tonnes of gold and platinum ingots, along with a load of uncut diamonds.

It was all worth some 21 billion roubles ($504,000,000).

But the heavy bags and boxes containing the load in the cargo transport's belly were not securely loaded.

According to official government news agency TASS, a total of 172 bars broke loose as the Nimbus Airlines AN-12 aircraft lifted off from Yakutsk, the capital of Russia's eastern Siberia diamond mining region. That's more than three tons of gold falling from the sky after the transport took off.

"According to preliminary information, 172 ingots weighing about 3.4 tons were found, the cargo crumbled along the runway (at the Yakutsk airport) due to the fact that the cargo was incorrectly fixed. Some of the gold fell out, there were about 9 tons," a statement from the Ministry of Internal Affairs admits.

According to local media, the shifting gold tore open a ramp and part of the aircraft's body as the heavy slid backwards during takeoff.

The ramp fell on to a nearby car show yard. The gold continuously trickled out.

Secret service agents and police were summoned to mount an urgent and intensive effort to recover all the gold bars scattered over both runways and the 26km route the cargo aircraft took between them.

According to the Siberian Times, several cargo engineers from the airport of departure were detained. TASS says the engineers were members of the aircraft's own crew.

The Nimbus airline has not yet issued a statement.

The cargo belonged to the Chukota Mining and Geological company; 75 percent owned by Canadian Kinross Gold.