Is Mines a Proper Word?

Mines is a dictionary-recognized word, but only as a plural noun (They sentenced the criminal to hard labor in the mines.) At the school where I used to teach, however, it was common for students to use this as the first person possessive pronoun: Me: Whose pen is this? ... The word is simply mine.

Can you say mine's?

Basically, the pronoun "mine's" (or "mines") does not exist. The only definition of "mines" is the plural of the noun "mine."

Can you use mines in a sentence?

Mines sentence example. The mines will chain-detonate. Romas rescued me from the cave before you blew up the mines . Near the city are valuable coal mines , and there is one within the city limits.