Is mine a verb or noun?

The Word mine is a:

Noun: an excavation to extract minerals from the earth.

• The mine is the largest employer in the county.

Verb: to obtain minerals from an excavation; to delve into and make use of.

• We'll mine the archives for the information we need.

Pronoun: takes the place of a noun for something that belongs to me.

• The blue car is mine.