silver mine vs mine

silver mine and mine both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver mine	Yes	No	No	No
mine	Yes	No	Yes	No

As nouns, mine is a hypernym of silver mine; that is, mine is a word with a broader meaning than silver mine:

silver mine (noun)	mine (noun)
a mine where silver ore is dug	explosive device that explodes on contact; designed to destroy vehicles or ships or to kill or maim personnel
	excavation in the earth from which ores and minerals are extracted

silver mine (verb)	mine (verb)
	lay mines
	get from the earth by excavation