This applies to PRB:

http://prospectingjournal.com/well-financed-miners-will-survive/

From the article:

This got me thinking . . . If you can’t always diversify away from trouble, what is the immediate step that companies should take to ensure the confidence of their shareholders? And, most importantly, what should potential investors look out for when considering a stock?

Although it sounds too simple to warrant attention, money is key. Ron Stewart, Head of Research at Dundee Capital Markets, recently told BNN that the biggest danger for juniors is the drying up of capital.