Diamond mine vehicle graveyard

The mine owned by De Beers is reputed to have the largest private earth moving fleet in the world.

Once a machine has been used for diamond harvesting in the De beers mine, it won't leave the mine anymore, even after it's Obsolete. Machines of any types have been piling up in the graveyard since the 1900's. The reason seems to be that people could find diamonds trapped in those old machines.