So far today I make it out to be roughly half of the trading on the main TSX  with the rest over secondary/darkpools.....yesterday was about 850K on the TSX with about 500K on the secondary/darkpools.

I find the Tri-Act Match Now to be an intriguing platform, over 70K shares trade there yesterday and almost 60K today.  Here's a link to their web site:

http://matchnow.ca/about/

Here's one little snippet from that page:

Anonymity

• As Canada’s largest dark pool for equity securities, MATCHNow facilitates liquidity when you don’t want to show your intentions on a lit venue.