sitting on a gold mine

sitting on a gold mine

Fig. in control of something very valuable; in control of something potentially very valuable. When I found out how much the old book was worth, I realized that I was sitting on a gold mine. Mary's land is valuable. She is sitting on a gold mine.
See also: gold, mine, on, sitting
References in periodicals archive ?
As to whether Co Armagh could literally be sitting on a gold mine, he said: "That's the ultimate goal and what we are hoping for.
Colombia could be sitting on a gold mine, several of them actually.
As to whether Co Armagh could literally be sitting on a gold mine, he added: "That's the ultimate goal and what we are hoping for.
A recent New York Times supplement article stated that in power-line telecommunications "American utilities maybe sitting on a gold mine.