a mine yielding gold.
a source of great wealth or profit, or any desirable thing.
a copious source or reserve of something required: a gold mine of information about antiques.
Origin of gold mine
late Middle English word dating back to 1425–75
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for gold-mine
Historical Examples of gold-mine
If it is, I would rather own that property than any gold-mine I know of.'
Have you any more of the gold-mine stock you offered me some time ago?
Porportuk was bourgeois, and Porportuk bought him out of the gold-mine.
She represented his gold-mine, without which he had no means of living.
And when Gustus is twenty-one he will have half the money that came from the gold-mine.
British Dictionary definitions for gold-mine
Derived Formsgold-miner, noungold-mining, noun
a place where gold ore is mined
a source of great wealth, profit, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for gold-mine
late 15c., from gold + mine (n.). Figurative use by 1882.
Online Etymology Dictionary, © 2010 Douglas Harper
Idioms and Phrases with gold-mine
A rich, plentiful source of wealth or some other desirable thing, as in That business proved to be a gold mine, or She's a gold mine of information about the industry. [First half of 1800s]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.