Hatfield Colliery - the last remaining deep mine pit in Yorkshire - is to close with the loss of more than 400 jobs.
Workers at the worker-owned pit, which is near Doncaster, will be officially told tomorrow that production is to stop.
It was expected to stay open until summer 2016. Just over 300 workers will be laid off initially with the remaining 89 being kept on to oversee safety work and the filling in of the shafts.
The news comes just weeks after the closure of Kellingley and Thoresby Collieries was announced.
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