Attached files

file filename
S-1/A - S-1/A - CLOUD PEAK ENERGY INC.a2195113zs-1a.htm
EX-23.2 - EX-23.2 - CLOUD PEAK ENERGY INC.a2195238zex-23_2.htm
EX-21.1 - EXHIBIT 21.1 - CLOUD PEAK ENERGY INC.a2195238zex-21_1.htm

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We hereby consent to the use in this Registration Statement on Amendment No. 4 to Form S-1 of our report dated August 12, 2009 relating to the financial statements of Rio Tinto Energy America Inc. and Cloud Peak Energy, Inc., which appears in such Registration Statement. We also consent to the references to us under the heading "Experts" in such Registration Statement.

/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
Denver, CO
November 9, 2009