I've noticed that block trades usually only show up on days when our volume is relatively high. Today was 438,300 in total. They have been sporadic in the past.
I'm not really sure how important it is except that someone has opted to purchase shares in a block amount rather than on the market so as not to disrupt the share price trading. As far as I'm concerned it implies a motivation and organization ahead of time. Sometimes it means someone is trying to dump shares, but I think in our case it is someone trying to establish a position without driving the price up.
I'm trying to keep an eye on TD Sec because I think they've been buying a lot. It is very difficult to say this with certainty however, since there are many sells as well because obviously people are trading regularly with them. I just think I've noticed a lot more buying than selling so I'm slightly optimistic that someone is buying up what they can.
It's just more information that might prove important.