The Construction, Forestry, Mining and Energy Union (CFMEU) claims BMA-operated Bowen Basin mines are undergoing a casualisation of the work force.
CFMEU mining and energy district president Steve Smyth said the old workers had been offered a sub-standard workplace agreement and were threatened with replacement if they voted against it.
Positions formerly held by permanent employees have been readvertised through labour hire and contracting companies on SEEK.com.
“BMA is on an intimidation crusade against workers,” Smyth said.
“Casual workers have little rights and no job stability.”
Smyth said the new labour hire workers were taking home $700 less per week than former permanent employees.
A spokesperson for BMA was continuing to conduct consultation meetings with employees and their representatives.
Smyth said the CFMEU wanted to know how BMA would mitigate job losses.
Meetings between CFMEU and BMA will continue next week.