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t-.]o <br />Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />T: 970-824-1573 <br />July 14, 2011 <br />Mrs. Janet Binns <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Minor Revision - 111, Map 29 Edit to revised the 2011 Spoil Grading Block <br />Colowyo Coal Mine, Permit No. C- 1981 -019. <br />Dear Mrs. Binns: <br />Enclosed please find two copies of Minor Revision (MR) 111. MR -111 revises Map 29 to <br />reflect mining limits in the East Pit, specifically the 2011 spoil grading block. As <br />discussed in our meeting on April 5, 2011, Colowyo did not mine as far as anticipated in <br />the East Pit; therefore, less area was disturbed by mining. This revision revises the 2011 <br />spoil grading block to accurately reflect the limits of disturbance and spoil grading that <br />will take place in 2011. The revision does not revise the approved post mining surface <br />that will be achieved in that area. <br />Additionally captured with this revision (as was completed under MR -108), Colowyo has <br />revised the post -mine topography (PMT) tie in, into the native topography. The PMT <br />surface was not modified in any instance, but a clean up effort to ensure the native <br />topography and PMT surface tie in locations accurately reflecting actual on the ground <br />mining limits. Figure 1 — Map 29 Edits has been provided which delineates the areas that <br />are modified by this revision. Figure 1 is provided for agency review only and is not <br />intended to be a permanent part of the permit document. <br />Also included with this minor revision is a revision application and an index sheet for this <br />change. If you have any questions or require additional information, please feel free to <br />contact me at your convenience at (970) 824 -1532. <br />Sincerel <br />Tony Tennyson <br />Environmental Engineer <br />End. 2 copies <br />Cc: file CF 1.1.1.98 <br />Colowyo Coal Company • 5731 State Highway 13 • Meeker, CO 81641 <br />T+ 1 970 824 1529 • F+ 1 970 824 1598 • http: / /prospect.riotinto.org /irj/portal <br />