Here's a fun little article from Gold Report: horror stories from junior mining!
No seriously: Bob Moriarty gets interviewed about companies whose stock prices have been so decimated that they're trading at a discount to cash, even with what he considers valuable assets besides.
I wouldn't touch these, since you could say "well, they obviously suck real bad or else why would they trade even at a discount to cash?"; after all, even the cash will disappear if you have idiot management paying themselves huge enough salaries to do nothing. But, maybe if you have some sort of system that watches stocks for you, you could stick the tickers in and tell your machine to let you know when they stop sucking price-wise.