From Hard Assets Investor:

Taken as a whole, coal industry stock prices have done pretty well for themselves since January, and... playing the Market Vectors Coal ETF (KOL) is a good way to trade the entire sector.

But sometimes investors want a more targeted approach, choosing one or more companies to invest in. That's the allure of stock-picking: Even in the best-performing sector, there will always be that one shining star - and that one stinker to avoid.

But as we enter earnings season, it can be tough to tell which is which, given that coal mining companies are...

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