Yes it was Silverwood Colliery, Thrybergh, Rotherham; I used to work there. They replaced the name Silverwood with a fictional Clayfield Colliery, At the time of filming, coal production had ceased and most of the workforce had been made redundant. Just a few workers and management were left to do salvage and prep for full closure. Some of these men appeared as extras in the film, eg stretcher bearers.