Talks will get underway tomorrow between the Tara Mines' operator and unions.
It's over the temporary closure of the plant in County Meath.
Up to 650 workers will be affected by temporary redundancies.
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SIPTU Divisional Organiser Adrian Kane says they've asked the company to consider alternatives.
"Management have now agreed to this position and we will endeavor in intensive talks which are to begin on Monday to work towards an outcome which will maintain the operation of this mine".