The Mosaic Company is laying off about 80 staff as it idles its potash mine at Colonsay, north of Regina.
It laid off 340 workers at Colonsay on August.
The company said it will make up production at its mines at Esterhazy and Belle Plaine while the Colonsay mine is in "care and maintenance mode."
It blamed a wet spring, an export decline to China and increased inventories for the mine’s closure.
