YANCOAL will reduce the number of workers at its Stratford and Duralie mines by nearly a fifth.
The miner has said it will cut 60 jobs from both operations.
A fact sheet on the company’s website said the mines currently employ about 348 people.
These are a mix of contractors and direct employees.
Stratford Coal Mine has a workforce of about 120 people.
In a statement the company said the decision was a result of increasing costs and lower returns.
“The decision to reduce operational capacity was made to minimise losses across the operations and is a result of the current economic environment of high operating costs and low commodity prices,” a spokeswoman said.
“There will be a reduction of 60 positions from the permanent workforce.”