Definitions for salt mine
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Princeton's WordNet
salt mine(noun)
a mine where salt is dug
treadmill, salt mine(noun)
a job involving drudgery and confinement
Wiktionary
salt mine(Noun)
Any mine used for the extraction of salt.
salt mine(Noun)
Any laborious work, especially in a confined space.
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"salt mine." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/salt mine>.

