2014-02-21_INSPECTION - C1981019

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Februan- 18, 2014 C- 1981 - 019 / Colowyo Coal Mine RDZ Inspection Topic Summary NOTE: Y= Inspected N =Not Inspected R= Comments Noted V= Violation Issued NA =Not Applicable R - Air Resource Protection Y - Availability of Records R - Backfill & Grading R - Excess Spoil and Dev. Waste Y - Explosives Y - Fish & Wildlife R - Hydrologic Balance R - Gen. Compliance With Mine Plan N - Other NA - Processing Waste R -Roads R - Reclamation Success Y - Revegetation NA - Subsidence Y - Slides and Other Damage R - Support Facilities On -site R -Signs and Markers NA - Support Facilities Not On -site NA - Special Categories Of Mining Y - Topsoil COMMENTS A complete inspection was conducted by Rob Zuber of DRMS on February 18, 2014 through February 20, 2014. The Colowyo employees who participated in the field inspection were Kurtis Blunt, Tony Tennyson, Elliott Russell and Steve Gilmer. The weather was indicative of spring: sometimes were clear and warm, sometimes were cold and windy, and a snow storm was experienced. The ground was covered with snow over some of the mine site, and much of the site was very muddy. Access to some areas was very limited. For example, the road to the Section 28 Pond was covered with snow, and much of East Pit reclamation was inaccessible due to mud and snow. South Taylor Pit was inspected on Thursday, which is typically a non - production day so that maintenance can be conducted on the equipment. Other than the high wall mining operations, very little activity was taking place. The 115 excavator has been exposing B3 coal in the southwest corner of the pit, but was idle on this day. Drill rigs are on -site; one for blast drilling and one to calibrate the Mine Star system. The highwall mining operations in South Taylor have progressed. ADDCARR has completed all of the holes along the north panel (10 holes) and is working on the east wall where they are on the eighth hole from the north. In this eighth hole, they have dug about 380 feet into the wall. The operation was moved to the north side of the pit from the south side (where several holes were completed) to avoid problems with water collection in the spring, since the north end is the low portion of the pit. Mining has been completed at the south end of the box cut, and trucks were moving material into this area during the inspection. In the West Pit, the 103 dragline was moving F overburden, and dozers were cleaning F seam coal. AIR RESOURCE PROTECTION — Rule 4.17: Water trucks were seen controlling dust from the haul roads. Number of Partial Inspection this Fiscal Year: 7 Number of Complete Inspections this Fiscal Year: 3 Page 2 of 11