It happened in June, 2012 at the Allan mine east of Saskatoon.
A company spokesperson said Reid was trapped under equipment that moves raw ore to the main conveyor belt. The remote stop was not triggered or pushed.
A company spokesperson said since Reid's death new safety measures have been introduced, including a remote stop that workers can wear.
PotashCorp must pay a total of $280,000 in fines and surcharges.