Around 90 jobs are expected to be lost at a Victorian cement works.
Boral Cement is restructuring operations at its plant at Waurn Ponds, near Geelong.
The Australian Workers Union (AWU) says it will work with the company to try to salvage some of the 90 jobs the company has announced will go from its limestone quarry and cement works.
After a review of its operations, the company has announced it will now import cement clinker to cut costs.
The union will hold a mass meeting of workers next Tuesday.
AWU Victorian secretary Cesar Melhem says the union has had preliminary talks with Boral and will do all it can to try to save jobs.
"They're going to import a lot of the product due to the high cost of the Australian dollar and other cost measures," he said.
"I am not optimistic that we are going to be able to save many jobs, but we're going to try and save as many as we can."