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P3µ/ ; A"x- <br />Martin Marietta Materials <br />P. O. Box 30013 A '2011-001 <br />Raleigh, North Carolina 27622 -0013 <br />Telephone (919) 781 -4550 <br />M I ? � -a3 <br />April 27, 2012 <br />Mr. Peter S. Hays <br />Environmental Protection Specialist <br />State of Colorado <br />Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman St, Room 215 <br />Denver, CO 80203 <br />Re: Martin Marietta Materials, Inc. Financial Warranty Increases <br />Greeley 35th Ave Pit; File No. M- 1977 -036 <br />Duckworth Pit; File No. M- 2003 -091 ./ <br />Iverson Mine; File No. M- 2011 -001 <br />Dear Mr. Hays: <br />Please accept the enclosed Surety Riders for the following bonds: <br />RECEIVED <br />MAY 0 4 2012 <br />Division of Reclamation, <br />Mining & Safety <br />• Bond No. increases the amount of File No. M- 1977 -036 from <br />$967,789.00 to $4,546,572.00 <br />• Bond No. increases the amount of File No. M- 2003 -091 from <br />$408,000.00 to $616,000.00 <br />• Bond No. increases the amount of File No. M- 2011 -001 from <br />$233,400.00 to $275,300.00 <br />If should you have any questions, please contact me at 919.510.4746 or at <br />rebecca.gomez(amartinmarietta.com. <br />cc (via email): Julie Mikulas <br />Respectfully <br />Rebeca L. Gomez Porras <br />Insurance Administrator <br />17' <br />7 <br />d5)fn V e2VO <br />