Sep 02, 2010. /Lesprom Network/. Tolko Industries Inc. is extending its curtailments at its Soda Creek and Armstrong stud operations in British Columbia, Canada, as ForestTalk reported. The curtailments will continue until September 6. After that time, a restart will be reconsidered on a week to week basis. The mills have been shut down since August 23, affected 315 employees. Poor market conditions are to blame for the curtailment.