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gold mine

noun
1.
a mine yielding gold.
2.
a source of great wealth or profit, or any desirable thing.
3.
a copious source or reserve of something required:
a gold mine of information about antiques.
Origin
late Middle English
1425-1475
1425-75; late Middle English
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for gold-mine

gold mine

noun
1.
a place where gold ore is mined
2.
a source of great wealth, profit, etc
Derived Forms
gold-miner, noun
gold-mining, noun
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
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Word Origin and History for gold-mine
n.

late 15c., from gold + mine (n.). Figurative use by 1882.

Online Etymology Dictionary, © 2010 Douglas Harper
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Idioms and Phrases with gold-mine

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 Company. Published by Houghton Mifflin Company.
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Difficulty index for gold mine

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Word Value for gold

6
8
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Quotes with gold-mine