A worker has been killed at a Hunter Valley mine on Monday afternoon.
Emergency services were called to the United Wambo mine, west of Singleton, about 1pm following reports that a man had been struck by a truck.
The man, believed to be in his 50s, died at the scene.
"Our sincere condolences go out to the worker's family, friends and colleagues. This is tragic news for our entire workforce," Peter Sharpe, chief executive of Glencore's coal business, said.
"Our immediate focus is on providing support to the worker's family and our employees."
The mine worker's death has been referred to the coroner and mining operations at the site have been suspended.
Relevant regulatory authorities have been notified.
Mining and Energy Union Northern Mining and NSW Energy District president Robin Williams said the union's thoughts were with the worker's family, friends and workmates.
"This is absolutely devastating news. Our deepest condolences are with the worker's loved ones and everyone affected by this tragedy," he said.
"Right now, the focus needs to be on supporting the workforce and respecting the privacy of the family.
"Every worker has the right to come home safely at the end of every shift. Any workplace fatality is one too many.
"It's important the relevant authorities are given the time and space to conduct a thorough investigation so the circumstances of this tragedy can be fully understood."
The incident occurred on the same day as the annual NSW Mining Health, Safety, Environment and Community conference was taking place at Cessnock.
"This tragedy highlights the hazards faced by those working in our industry and is a sombre reminder of why the safety of our workforce must always be our number one priority," NSW Minerals Council chief executive Stephen Galilee said.
"The thoughts of tens of thousands of miners across NSW will tonight be with the family and colleagues of the deceased, and also with the Hunter mining community at this difficult time."
The Minerals Council of Australia (MCA) also expressed its condolences.
"The MCA also thanks the emergency services personnel who responded to this incident," MCA chief executive Tania Constable said.
"Safety remains the highest priority for our industry, and any loss of life is a stark reminder of the critical importance of our ongoing efforts to ensure every worker returns home safely.
"As an investigation is now underway in cooperation with local authorities to determine the cause of the incident, no further comment will be made."
About 560 people work at the Wambo Joint Venture, which commenced operation in 2020 and produces thermal and semi-soft metallurgical coal for export.
Federal Hunter MP Dan Repacholi described Monday's fatality as heartbreaking, and urged workers to care for each other during the difficult days and weeks ahead.
"Our mining communities are built on hard work, mateship and looking out for one another. When we lose one of our own, the impact is felt right across the Hunter," he said on social media.
"Every worker deserves to go home safely at the end of every shift. There is nothing more important than making sure our workers are protected.
"Please check in on your mates over the coming days. If you're struggling, don't bottle it up. Help is available. Lifeline - 13 11 14 Beyond Blue - 1300 22 4636."
