Ghost-like mounds of powder-like gold can be seen, forever waiting for transportation to the northern Mexican city of San Luis Potosi for refinement.

BBC: In Oaxaca, a community unchanged

Angst about government currencies has traditionally sent people flocking to gold, and for many devotees of the shiny stuff, gold remains the one and forever answer.

BBC: Killing off cash: Could new tech mean the end of money?

But the revenue from Angola's black gold won't last forever.

CNN: Oil-rich Angola bids to secure future with $5bn wealth fund

But unlike gold, it does not necessarily last forever.

FORBES: The Last Bank Standing -- for the Moment

He changed the face of the Games forever by being the first Chinese man to ever win a track gold medal, with victory in the 110m hurdles.

CNN: China takes the Olympic limelight