surface-mine vs strip mine

surface-mine is not a noun while strip mine is a noun.

Word	Noun	Adjective	Verb	Adverb
surface-mine	No	No	Yes	No
strip mine	Yes	No	Yes	No

As verbs, surface-mine and strip mine are synonyms defined as:

Other synonyms of surface-mine include surface mine.

surface-mine (noun)	strip mine (noun)
	an open mine (usually for coal) where the seams run close to the surface

surface-mine (verb)	strip mine (verb)
extract (ore) from a strip-mine	extract (ore) from a strip-mine