How do you make a sentence using the word mines?

Answer 1

Noun: They laid a mine every two feet across the harbor mouth.

Noun: The gold came from a mine in Zimbabwe.

Verb: We can mine the field so the enemy can't cross it.

Verb: They mine for diamonds in Africa.

But I think you are probably asking about the pronoun. "Mine" is a predicate possessive in Modern Standard English, meaning that it is only used in the predicate and never attributively, that is, never directly in front of a noun. (This did happen in Middle and even somewhat later English, when the difference between "my" and "mine" was like that between "a" and "an". So you will see it in older texts.)

Whose book is that? - It is mine. (Not "It is my" or "It is mine car")

The car parked out on the street is mine, not hers. (Not "is my, not her")

The other possessives that work like "mine" are "yours, his, hers, ours, theirs".

Answer 2

These gold mines have been abandoned for many years.