Longman Dictionary of Contemporary English - mine

~1 pronoun (possessive form of 'intransitive`) the one or the ones that belong to me  ("Whose is this coat?" "It must be mine." | Can I borrow your CD player? Mine's broken. | a friend/cousin etc of mine)  (an old teacher of mine) ~2 n 1 a deep hole or series of holes under the ground that are dug in order to find coal, gold, tin etc  (coal/gold/copper mine etc)  (He works in the coal mines.)  (- compare quarry1 (1)) 2 a type of bomb that is hidden just below the ground or under water and that explodes when it is touched 3 a mine of information/gossip etc someone who knows a lot about something or a book that tells you a lot about a subject 4 a passage dug beneath the place where an enemy army is ~3 v mined, minning 1 to make holes or passages under the ground in order to take out coal, gold etc, or to take coal, gold etc from these holes + for  (mining for coal) 2 T often passive to hide bombs in the sea or under the ground  (All the roads leading to the city had been mined.) 3 to dig a passage under the ground beneath the place where an enemy army is ~4 determiner old use a way of saying 'my', before a vowel sound or 'h', or after a noun  (mine host)