Robertson says he got a "lucky break" when the miners went on strike.

FORBES: Fuel's Paradise

But he was lucky with his goal, snatching at a Valencia cross only for the ball to strike him flush in the face before deflecting into the net.

BBC: Chelsea 1-3 Man Utd

Like junior companies in mining, the independents now conduct much of the industry's exploration for oil in relatively uncharted areas, their share price rocketing if they strike lucky.

ECONOMIST: Small oil firms