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March 25, 2010 <br />Mr. Ralph Trotter <br />Wold Oil Properties, Inc. <br />139 West 2nd Street, Suite 200 <br />Casper, Wyoming 82601 <br />Subject: Pre -Blast Survey Report — Wold Oil Pipeline <br />Colowyo Coal Company — Collom Mining Area Expansion <br />5731 State Highway 13 <br />Meeker, Colorado <br />To Whom It May Concern: <br />Colowyo Coal Company is currently preparing permit documents to request expansion of the <br />existing permit boundary to the west in order to facilitate additional mining activities directly <br />west of its current operation located between Meeker and Craig, Colorado. In accordance with <br />Section 4.08.2 of the Regulations of the Colorado Mined Land Reclamation Board for Coal <br />Mining, you have the opportunity to request pre -blast surveys of all structures owned and <br />operated by you and or your organization that are located within one-half mile of the proposed <br />permit boundary expansion. A description of the permit area is attached to this letter, in addition <br />to structures and or dwellings that Colowyo has identified as being within one-half mile of the <br />proposed permit boundary. In order to request a pre -blast survey please contact Mr. James Stark, <br />Colorado Division of Reclamation Mining and Safety, Colorado Department of Natural <br />Resources, 1313 Sherman Street, Room 213, Denver, Colorado 80203 or by telephone at (303) <br />866-3567 extension 8145. Please contact me with any questions at (970) 824-1531 or via email <br />at kurtis.bluntgriotinto.com. <br />Sincerely, <br />Kurtis R. Blunt <br />Environmental Engineer <br />Rio Tinto Colowyo Mine <br />Attachments: Permit Revision Boundary Description <br />Exhibit 7, Item 8 Figure 2 — Half -Mile Blast Survey (Wold Oil Pipeline) <br />Copies: File <br />