Staff have been through an upskilling and induction process.
Tara Mines is fully operational again after an 18-month lay off.
Owner of the mines, Boliden, closed the facility last year, with a temporarily loss of over 600 jobs.
200 workers have taken a voluntary redundancy package, meaning the 405 remaining needed to upskill, with many just completing a return to work induction training and familiarisation process.
SIPTU Sector Organiser, John Regan, says: “There is a sense of relief among workers and the communities throughout the north-east with the full reopening of the mine and the first blast to develop a mineral vein, taking place this week."
While SIPTU Organiser, Andrew McGuinness says the reduction in labour costs and a change in mineral prices should see the mines return to profit in the short term.
JNLR Figures Reveal Growth In Midlands 103 Listenership
Judge Considers Sending Enoch Burke Back To Prison After Latest Court Clash
Tributes Paid To Retiring Midlands Superintendent
Midlands Senator Questions Accuracy Of EPA Report On Illegal Peat Extraction
42 Projects Represented At EU Just Transition Fund Showcase
Meath Case Detected As Bird Flu Spread Continues
Archaeological Finds Uncovered In Westmeath
Laois Councillor Calls For Rightsizing Housing Policy
Stronger E-Scooter Laws Needed - Carol Nolan
Offaly Blogger Shares Cost Saving Christmas Gift Tips
Midlands Hospital Apologises Over Westmeath Woman's Cervical Cancer Diagnosis
National Housing Order For Poultry Confirmed
Offaly Cathaoirleach Calls Out Sinn Fein Councillor Over Livestreaming Campaign
Gardai Arrest Man Over Hijacked Car In Midlands
IFA Calls For Poultry Housing Order As Bird Flu Cases Rise
Man And Woman Arrested After Public Order Incident In Offaly
Meals On Wheels Returns To Laois Town After Two Year Gap
Midlands Pride Festival Kicks Off Today
Gardai Praise Safety Organisation For Hard Work
Westmeath Councillor Calls For Compromise On Housing Development