Yamana at these prices is a screaming bargain here and we all know it. I've accumulated at these levels nervously for reasons beyond simply YRI themselves - mainly that who knows where this all goes. Clearly there are funds being liquidated that were leveraged, and that hasn't hit the wires yet. But, that will lead to money being printed which should in theory help gold out.
There are forces playing that are bigger than just the commodity markets. I am pretty convinced there's a dollar intervention going on to drive commodity prices down and thereby reducing inflation levels. This however will be temporary and should not affect junior miners. Most have been heavily punished and this just seems to be a bottom spike in commodities. I think we'll see buyers rushing into metals pretty soon again.
I for one am Confident of a mid september rally. As for their gold per ounce valuation don't forget that YRI was a small cap that graduated to the big boys but they have wealthy properties and their fundamentals are sound. Have a looksy at the link library or view the companies corporate presentation.
Best of luck!