The world price for coal is way up this year, which has had many companies rethinking current plans. One global mining company has reversed its emergency fire-sale, after its stock went up nearly 300 percent. 

Another mining giant is back to paying dividends to investors, and yet another is plowing money back into mines. But can the price rally last? And what does it mean  for U.S. coal mining companies, and their workers?  

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