Difference Between My and Mine
As you rightly note, my is a possessive adjective and mine is a possessive pronoun. So, this means you use my where you already have a noun (such as question) and want to indicate ownership. Like with all pronouns, you use mine in place of another noun when it's understood what's being discussed.
Is my mine correct?If you own either an explosive device or an excavation from which minerals are extracted - both of which are called “mines”.