Illinois

New Frontier Materials Bluff City said the sinkhole resulted from “surface subsidence” at its underground mine in city, located about 25 miles (40 kilometers) north of St. Louis along the Mississippi River.

The collapse was reported to the federal Mine Safety and Health Administration, as required, company spokesman Matt Barkett said. He told The Associated Press the limestone mine is located about 170 feet (52 meters) below ground and it’s his understanding that it runs under the city park where the sinkhole appeared.

“The impacted area has been secured and will remain off limits for the foreseeable future while inspectors and experts examine the mine and conduct repairs," Barkett said in a statement. “We will work with the city to remediate this issue as quickly and safely as possible to ensure minimal impact on the community.”