gold mine

black gold

Raw petroleum; crude oil.

comedy gold

Something that is very funny or humorous.

cross of gold

A public policy which puts the interests of the rich ahead of those of the poor.

everything one touches turns to gold

Everything someone uses or does succeeds or becomes better.

go for the gold

To attempt to achieve the maximum result or reward in an endeavour.

gold in them thar hills

An opportunity for something to be profitable and/or beneficial.

heart of gold

A kind, compassionate, or caring attitude; kindheartedness; a person with those qualities.

the streets are paved with gold

Used to describe a place where it is easy to become wealthy or live well.