Oil is falling, probably dilbit too although I haven't checked lately. So as goes the price of oil, so goes the price of oil company stocks. Look at the big Cdn majors, their sp also taking a hit. Absent any material change in CLL's (mis)fortunes, and going by DG's last news release, nothing has changed. This still is a company that generates a tiny profit and pays it's bills. So CLL just caught up in the oil price downdraft I think. Will be interesting to see where the bottom is formed.
But it can work both ways. When the colder weather rolls in, up goes oil and up go the sp in that sector.