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Rio Tinto Energy America Page 1 of 2 <br />Colowyo Mine <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />August 1, 2006 <br />ADDENDUM TO 180 -DAY REPORT <br />NOTICE OF INTENT NUMBER CX- 2005 - 109 -11 <br />2. Describe reclamations activities <br />As of this date, all activities related to this NOI and its amendments are complete. Drilling <br />activity occurred on a total of 98 drill sites. The drill sites were located in the active West Pit <br />(24), south and west of the West Pit (17) and the Collom project (57). The Collom project area <br />is approximately 4 miles west of the current Colowyo mining area. The drill sites are shown on <br />the accompanying map. <br />WEST PIT (WP) DRILL SITES <br />Of the 24 West Pit drill sites (noted as 'WP-05' on the map), 10 were located in the active West <br />Pit mining limits. The drill sites are WP -05 -11 through -15, -18 through -20, -22 and -23. All <br />drill/core holes on these sites did not exceed in depth the lowest currently mined seam at <br />Colowyo — the FI coal seam. No plugging of the holes on these sites was performed since the <br />holes will be mined through in the future. However, all holes on these sites were covered with a <br />"durable cover" (rock, etc.) over the open drill hole and with the "durable cover" covered with <br />soil or weathered rock for safety. These sites will be reclaimed during the reclamation of the <br />West Pit. <br />WP- 05 -16, -17 and -21 were moved from their original locations to the south by up to 2,500 feet. <br />The rest of the West Pit drill sites are located within a reasonable distance of their original <br />location. All drill and/or core holes on all the drill sites outside of the active West Pit mine limits <br />(a total of 14) have been sealed and/or plugged using the method described in the NOI. No <br />further activity is planned for these sites. <br />Any drill hole site in Section 16 was not reclaimed since the Section 16 surface mine has not <br />been reclaimed at this time. The remainder of the `WP' drill sites (8), in Sections 4, 8, and 17, <br />have been reclaimed and topsoil replaced. These sites have been reseeded. <br />LOWER WILSON (LW) DRILL SITES <br />All 17 `LW -05' drill sites, located south and west of the West Pit, were completed. The <br />respective drill and/or core holes on the drill sites have been sealed and/or plugged using the <br />method described in the NOI. No further activity is planned for these sites. <br />Drill site LW -05 -17 was renamed MW- 05 -03, since it was planned as a shallow monitoring well. <br />The notice of intent to drill a monitoring hole and the subsequent monitoring hole completion <br />report have been filed with the Division of Water Resources for this site. <br />As of this date, all drill sites have been reclaimed and topsoil replaced. These sites have been <br />reseeded. <br />N: \CCC_ENG \LAM \GEOMODEL \Geomd12005\DMG Repms \AddmdumFina118odayrptfm05.doe <br />