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Rapid City, SD

Study: Abandoned gypsum mine could extend below SD interstate

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Panhandle Post
Panhandle Post
 2021-06-21
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RAPID CITY, S.D. (AP) — A study shows that an abandoned gypsum mine in Black Hawk that was exposed by a sinkhole in 2020 may extend farther than current mapped areas would indicate. Mohammad Sadeghi, a professor of geological engineering at Montana Technical University who led the study, says there’s...

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