Mine operations in Alton connected to a large sinkhole that consumed a city park field and light pole on Wednesday have stopped while authorities consider next steps to remediate the impacted property.

The halt of operations comes at the direction of the federal Mine Safety and Health Administration, according to a state late Thursday afternoon from the mine’s owner, New Frontier Materials.

Security video that captured the hole's sudden formation shows a soccer field light pole disappearing into the ground, along with benches and artificial turf at the city's Gordon Moore Park.

There were no injuries.

The hole is estimated to be at least 100 feet (30.5 meters) wide and up to 50 feet (15.2 meters) deep, said Michael Haynes, the city's parks and recreation director.

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

Geological experts are conducting “comprehensive inspections” until the park is considered safe for use.

We are fully dedicated to working with the City of Alton to remediate this issue swiftly and safely," said Mike Clarke, CEO of New Frontier Materials. "The safety of our community is paramount, and we appreciate everyone's cooperation and understanding during this time."

The public is urged to stay away from Gordon Moore Park until the all clear is given.