Two people have died and another has been flown to hospital after an underground explosion at a mine in far west NSW.

Emergency services were called to the mine on Endeavour Mine Road at Cobar, about 450km east of Broken Hill, about 3.45am on Tuesday, October 28.

Police said they had received reports that two people had been critically injured in a workplace incident.

When officers arrived, they were told a man had been confirmed dead after the explosion.

Two women were brought to the surface but one had since died, police said.

The second woman was airlifted to hospital suffering hearing damage and shock.

The Endeavour Silver, Zinc & Lead Mine is located 40km north of Cobar and is operated by Polymetals Resources.

Labor upper house MLC Stephen Lawrence, who represents Cobar as his

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