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TM(555 <br />Shell Exploration & Production <br />Shell Frontier Oil & Gas Inc. <br />3737 Bellaire Blvd. <br />Houston, TX 77025 <br />11111111CM <br />FED EX TRK # 7942 2366 2964 DEC 2 0.2olo <br />DiViWm at Rect n, <br />Aftfn# and wry <br />December 16, 2010 <br />Mr. Travis Marshall i r r `? <br />Colorado Division of Reclamation, Mining and Safety ' - <br />101 South 3rd Street, Suite 301 <br />Grand Junction, CO 81501 <br />Dear Mr. Marshall: <br />SUBJECT: ANNUAL PROSPECTING NOI REPORTS COWIDENTIAL. <br />MAHOGANY RESEARCH PROJECT <br />SHELL FRONTIER OIL & GAS INC. <br />In reference to recently promulgated changes to Rule 5.6 of the Hard Rock, Metal and <br />Designated Mining Operations regulations which revised the submittal deadline for Prospecting <br />NOI annual reports from year-end to the NOI anniversary date, Shell Frontier Oil & Gas Inc. <br />(SFOGI) hereby submits annual reports covering the 2010 reporting cycle for the following list of <br />NOIs which have anniversary dates which preceded the rule change. In calendar year 2011, <br />annual reports for these NOls will be submitted in accordance with their anniversary dates. <br />P-2003-015 P-2004-002 P-2005-001 P-2006-035 P-2007-010 P-2009-024 <br />P-2003-018 P-2004-003 P-2005-002 P-2006-036 <br />P-2004-011 P-2005-017 P-2006-037 <br />For each of these NOls, the information required by Rule 5.6 is contained in an annual report <br />form, location map(s), site map(s), and financial warranty cost summaries enclosed with this <br />letter. A separate package containing this information is provided for each NOI. Supporting <br />calculations for the financial warranty summaries can be provided upon request. SFOGI's <br />Statewide Prospecting Bonds applicable to these NOls remain in place and are more than <br />adequate to cover these updated warranty estimates. <br />Where appropriate, a table showing as-built hole depths is included in the annual report <br />package for those prospecting holes having this reporting obligation in the NOI. For your <br />convenience, a second copy of these tables are also included, but with the confidential <br />information redacted. <br />Please note that although NOls P-2004-002, P-2004-003 and P-2004-018 were recently <br />consolidated into NOI P-2003-022 (Modification No. 2, October 25, 2010), annual reports for <br />these four NOls are being submitted individually for the 2010 reporting cycle. Annual reports for <br />NOls P-2004-002 and P-2004-003 are enclosed with this letter. Annual reports for P-2003-022 <br />DRMS-Multiple Annual NOI Reports-121610.docx 1