goldmine
noun[C]
NATURAL RESOURCESuk/ˈɡəʊldmaɪn/usaplacewheregoldis taken from theground
something from which aperson,company, etc. canearna lot ofmoneyor that canprovidea lot of something thatpeoplewant:
Manufacturers ofcomputer-aideddesignsystemsarecompetingto takeadvantageof thispotentialgoldmine.
a goldmine of sthThere's a goldmine ofmultimediainformationat thesite.