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Martin Marietta Materials <br />1800 N Taft Hill Road <br />Fort Collins, CO 80521 <br />Telephone: (970) 407 -3600 <br />Fax: (970) 407 -3900 <br />June 20, 2013 <br />Mr. Berhan Keffelew <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Technical Revision to M- 1981 -307 <br />Dear Mr. Keffelew: <br />As done in the past and recommended during your last inspection, please accept this letter as our <br />request to increase the financial warranty and maximum disturbed acreage within the permit from 300 <br />acres to 450 acres. This will be our final build out. The remaining acreage in the permit will not be <br />disturbed for mining. <br />Enclosed is a spreadsheet with our quantity estimate of what still needs to be completed once mining is <br />done as well as a map showing where we are at now. <br />Please give me a call (970- 227 -4041) if any additional information is needed. <br />Sincerely, <br />Julie Mikulas <br />Land Manager <br />RECEIVED <br />JUN 2 0 2013 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />