Mining
Part of speech: noun
Definition: The business of removing solid valuables from the earth; e.g., gold mining.
Part of speech: verb
Definition: Working in a mine.
Example sentence: I have confidence in mining. I see exciting opportunities in it.
Excavation
Part of speech: noun
Definition: the act of excavating, or of making hollow, by cutting, scooping, or digging out a part of a solid massa cavity formed by cutting, digging, or scoopingan uncovered cutting in the earth, in distinction from a covered cutting or tunnelthe material dug out in making a channel or cavityarchaeological research that unearths buildings, tombs and objects of historical valuea site where an archaeological exploration is being carried out