Almost 600 workers will be laid off.
Tara Mines in County Meath will temporarily close today.
590 workers will be laid off, but 60 employees will stay on part-time to carry out care and maintenance work.
It's after they voted to accept a deal over their terms and conditions during the temporary closure.
Meath West Sinn Féin TD Johnny Guirke says it's a difficult day for workers:
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