mine

:  that which belongs to me —used without a following noun as a pronoun equivalent in meaning to the adjective my Your eyes are brown and mine are green.

1a :  a pit or excavation in the earth from which mineral substances are takenb :  an ore deposit

2 :  a subterranean passage under an enemy position

3 :  an encased explosive that is placed in the ground or in water and set to explode when disturbed

4 :  a rich source of supply

1a :  to dig under to gain access or cause the collapse of (an enemy position)b :  undermine

2a :  to get (something, such as ore) from the earthb :  to extract from a source information mined from the files

3 :  to burrow beneath the surface of larva that mines leaves

4 :  to place military mines in, on, or under mine a harbor

5a :  to dig into for ore or metalb :  to process for obtaining a natural constituent mine the air for nitrogenc :  to seek valuable material in mine old records for more details

:  to dig a mine

:  that which belongs to me That book is mine. Those books are mine.

1 :  a pit or tunnel from which minerals (as coal, gold, or diamonds) are taken

2 :  an explosive device placed in the ground or water and set to explode when disturbed (as by an enemy soldier, vehicle, or ship)

3 :  a rich source of supply She was a mine of information.

1 :  to dig or work in a mine They mined the hills for gold.

2 :  to obtain from a mine mine coal

3 :  to place explosive mines in or under mine a field