More than 150 people will lose their jobs at CBH Resources’ Endeavour Mine at Cobar in western New South Wales.
In a statement to the Australian Stock Exchange, the company said fewer workers were needed under a new operating plan at the mine.
In its quarterly report, the company said the plan involved taking higher-grade ore but lower tonnages to try to maintain the viability of the mine.
The company announced a major corporate and operational restructure at the Endeavour mine in June, cutting about 200 jobs.
Work was also temporarily halted at the Rasp Mine in Broken Hill.