Company:  CLOUD PEAK ENERGY INC. (CLD)
Form Type:  SC 13G/A
Filing Date:  2/11/2011 
CIK:  0001441849 
Address:  505 SOUTH GILLETTE AVE. 
City, State, Zip:  GILLETTE, Wyoming 82716 
Telephone:  307-687-6000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$17.49   		Change: 
-0.31 (-1.74%)  
Trade Time: 
04:02 PM EST   		Market Cap: 
$1.06B
Description of Business
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  FORM SC 13G/A
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