That has not been mined (dug from the ground).(adjective)
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Use "unmined" in a sentence
"And the lead bad guy in Inglourious Basterds was pretty damn awesome too … makes me think Germany is an unmined seam of good actors."
"Very little of his life — or body — has gone unmined."
"KGHM, the world's ninth-largest copper producer, said the acquisition of Quadra's Sierra Gorda mine in Chile would give it the world's fourth-largest unmined copper holdings, up from sixth currently."