HD Mining's plan to hire up to 201 temporary workers from China for its Murray River project, near Tumbler Ridge, was revealed last year.
The plan prompted federal politicians to suggest the permits shouldn't have been granted and led to a legal challenge from two unions, which ultimately ended in the company's favour.
Now, the United Steelworkers union has filed an application with B.C. Supreme Court asking that HD Mining's exploration permit be revoked.
The union's petition says the province's chief inspector of mines was wrong to issue permits in the face of concerns that the workers didn't speak English.
The notice says the provincial permitting process did not adequately address potential safety issues that would arise if workers did not speak English.
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