Continual deception?

So why did Robert Mugabe, tyrant and destroyer of Zimbabwe, ultimately renege on a deal to essentially grant China mineral rights in Zimbabwe (which are exceedingly valuable considering Zimbabwe has large reserves of precious metals and gems that Zimbabwe cannot get out of the ground)? Roger Bate, who has been following the story for The Weekly Standard, discusses China's reticence to enter a partnership with the syphillitic megalomaniac.