gold in them thar hills

Etymology
Originally used in the phrase “there’s gold in them thar hills”, possibly a misquote of the phrase “there’s millions in it” (viz. the North Georgia mountains) uttered in 's 1892 novel  by Colonel Mulberry Sellers, a character thought to be based on assayer.

Noun

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