"Mine" can be a pronoun (That coat is mine), a noun (They sealed off the entrance to the abandoned mine), or a verb (You would need to mine large amounts of data to get that kind of information).
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
silver is the most valuable part of Mexico's mining industry.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.