Nine miners were originally stuck at the Iamgold (TSX:IMG) mine in Preissac in the Abitibi-Temiscamingue region.
One report said one minor had been freed.
Company official Sylvain Lehoux said earlier today the miners were to be rescued this afternoon but they were still trapped more than 12 hours after a wall moved because of seismic activity in the area.
The company suspended operations for the day amid the rescue attempts.
Union spokesman Marc Thibodeau is expressing concern because it is the second such incident at the mine in four months.
In January, four men were trapped before being rescued.