What is the proper noun of mine?

Answer 1

The proper noun for possessive pronoun 'mine' is the possessive form of name of the person speaking. If your name is Mary, the proper noun would be Mary's. When you are referring to yourself, you don't normally use your own name. If someone asks, 'Whose book is this?' You would not answer, 'The book is Mary's.' You would answer, 'The book is mine.'

The proper noun for common noun 'mine' as a word for a place to dig for coal, is the name of a specific mine, such as the Antelope Coal Mine in Wyoming.