MONCKTON coke works is to close at the end of December.
The site's future was plunged into doubt two months ago when its owners, Hargreaves Services PLC, revealed it's losing money and had failed to secure enough long-term contracts.
The company issued staff with redundancy notices in October and consulted its 130-strong workforce on plans to close the plant.
The plant, which supplies coke destined for use in glass, detergents and steel manufacturing, has been hit because Chinese coke suppliers are able to undercut international prices.
Barnsley MP Dan Jarvis said: "Given the challenging economic climate, it will be very difficult for those families facing an uncertain future.
"Whilst I know the site hasn't always been popular with local residents, it's a big blow given the consequential impact it will have on the Barnsley economy."