The phrase "black gold" refers to oil or petroleum, which is valuable and can make people rich, just like gold.
Sentences with «black gold»
Increased usefulness brought about black gold's golden age. (canadianbusiness.com)
It is hard to see countries leaving black gold worth billions in the ground — and if they did all agree to do this, it could trigger another global financial crisis. (newscientist.com)
He is the author of Black Gold of the Sun: searching for home in England and Africa, nominated for the Orwell prize, and the editor of Africa Modern: creating the contemporary art of a continent. (ekoweshun.com)