Workers at Tara Mines in Co Meath will be balloted on an agreement brokered at the Workplace Relations Commission over the next two days.
It covers arrangements for workers during a period of temporary closure.
The zinc mine in Navan is due to be placed into "care and maintenance" on Friday. This means it will temporarily - with 650 workers being laid off.
Hundreds of workers from Tara Mines attended a meeting in a hotel in Navan last night to discuss the deal brokered following discussions between unions and management at the WRC last week.
Unions have recommended the deal which includes a retainer payment for staff and a provision they can return to work with the same pay and conditions when the mine reopens.
The meeting was described as difficult.
The company, Boliden, said it took the decision in response to significant and unsustainable financial losses, driven by a number of factors including a decline in the price of zinc and high energy prices.
It is not known how long the period of care and maintenance will last.
Workers will be balloted on the deal over the next two days and a result is expected on Thursday.
