Sinkholes are fairly common, due to collapsed caves, old mines or dissolving material, but the circumstances in South Dakota stand out, said Paul Santi, a professor of geological engineering at ...

Sinkholes are fairly common, due to collapsed caves, old mines or dissolving material, but the circumstances in South Dakota stand out, said Paul Santi, a professor of geological engineering at ...

A judge in South Dakota has thrown out a lawsuit brought by dozens of neighbors in a Rapid City-area subdivision whose homes were built above an old, underground mine linked to sinkholes in the ...

A judge in South Dakota has thrown out a lawsuit brought by dozens of neighbors in a Rapid City-area subdivision whose homes were built above an old, underground mine linked to sinkholes in the ...