 Gordon Moore Park in Alton will be closed until further notice after a sinkhole opened up at the turf fields near the entrance to the park on Wednesday morning. No one above or below ground was injured during the collapse, reportedly caused by surface subsidence according to New Frontiers Materials that operates mining in that area of Alton. The sinkhole, believed to be around 100 feet deep, swallowed a section of the turf between a soccer and football field a