 With the Big Z Media News Update, this is Mark Hellebrock. Gordon Moore Park in Alton will be closed till further notice after a sinkhole opened up at the turf fields near the entrance to the park Wednesday morning. No one above or below the ground was injured in the collapse reportedly caused by surface subsidence according to New Frontiers Materials that operates mining in that area of Alton. If you drive around Alton, you may occasionally see spots where the pavement has worn down to a brick base.