Nine miners were killed when a bomb exploded underground during a labour dispute at the gold mine.
Warren was convicted in 1995 and is serving a life sentence for the murders. This is the first time he has applied for day parole despite being eligible since 2010.
The Parole Board of Canada said it expects a hearing will be held in June.
Warren is serving time at a federal prison in B.C.'s Fraser Valley.Suggest a correction