Last week was one to forget for coal investors. The stocks of Walter Energy (OTC:WLTGQ), Arch Coal (OTC:ACIIQ) and Alpha Natural Resources (OTC:ANRZQ) were all crushed.

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While the market had its own rough patch, the decline in coal stocks was really the doing of Wall Street. A well-known firm cut its price forecast for metallurgical coal next year noting that Chinese import demand just isn't picking up as hoped. It also took down its price targets of Walter Energy, Arch Coal and Alpha Natural Resources, which caused these stocks to all take double-digit dives.

Investors wanting to take a closer look at the week that was in coal should check out the slideshow below. It provides some more details on what happened this past week as well as taking a look at what investors should expect going forward. It also suggests which coal stock investors think is the least likely to keep falling.