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How Do People Mine For Gypsum

The sinkhole collapse at 530 p.m. that day broke water and sewer lines that further ate away at the earth, widening the hole in the Hideaway Hills subdivision to 40 by 50 feet Arielle Zionts, 12 Blackhawk Families Displaced After Sinkhole Exposes Abandoned Gypsum Mine, Rapid City Journal, 2020.05.02.

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