Nearly 250 workers at the Windsor Salt mine will hit the picket line Friday morning.
Their union, Unifor, said demands from the owner to allow more contract work has led to the strike action.
"Their intent is clear: the company wants to weaken the union and populate the mine with more insecure and generally lower-paying jobs," said Bill Wark, President of Local 1959. "We can have good faith discussions on wage increases, but we will not allow the company to weaken union protections in the workplace. It's a non-starter."
Unifor Locals 1959 and 240 represent workers in the office of Windsor Salt and at the Ojibway Mine.
This is the first round of bargaining since Windsor Salt was purchased by Stone Canyon Industries in 2021.
"When the employer comes with concessions and schemes to bust the union, Unifor members are going to fight back every time," said Lana Payne, Unifor National President. "Workers at Windsor Salt have the full backing of our union."
