salt mine

1. A mine where salt is dug (synset 104138693)
   is a type of: mine - excavation in the earth from which ores and minerals are extracted
2. A job involving drudgery and confinement (synset 100607234)
   is a type of: business, job, line, line of work, occupation - the principal activity in your life that you do to earn money
   same as: treadmill

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