interesting trading pattern

Argo's had an interesting trading pattern in the past few days: relatively healthy trading in the first few hours, followed by a lull in activity and finally a pick up at the end. The last trade today just before market close, that took out the 13.5c line, is a good example.

For those who have a history of trading in such small and illiquid stocks, does this seem like the usual "position buidling" pattern? If this is a position building exercise, why risk missing out when the annoucement of drilling could come in any day and potentially lead to a jump in price?

As for the mid-day slowdown in activity, I guess it's a "tug-of-war" between the buyers and the sellers. Glad that it's been the buyers than have been yielding in the end ever since Friday!