Historic photographs from the 1960s show the US state of South Dakota operated a second gypsum mine beneath portions of the Black Hawk area that began to collapse in April 2020, forcing residents ...

A judge in South Dakota has ... cement plant mined gypsum for several years in the area decades ago. Attorneys for the state have argued that the cement plant did not mine underground and the ...

Sinkholes are fairly common, due to collapsed caves, old mines or dissolving material, but the circumstances in South Dakota stand out ... state where the mineral gypsum was mined for use at ...

For some residents of Hideaway Hills, that’s exactly what happened in April 2020 when a sinkhole formed revealing an abandoned gypsum mine ... the State of South Dakota and are seeking $60 ...

A judge in South Dakota has dismissed a lawsuit brought by dozens of neighbors in a subdivision beset by sinkholes caused by an old underground gypsum mine. The plaintiffs plan to appeal to the ...

A judge in South Dakota ... mine beneath. About 150 neighbors in 94 homes are seeking $45 million. Other holes and sinkings have occurred since, imperiling houses, roads and utilities, according to ...