2022-10-26_PERMIT FILE - C1981041 (5)

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2.05.2 Operation Plan - Estimated Area for Life of Operation • Room -and -pillar mining methods were used in recovering coal reserves within the permit area, including the Roadside North and South Portal areas. Modern mining equipment and procedures were employed to mine the coal. Major equipment included continuous miners, shuttle cars, continuous haulage units, roof bolters, and conveyor belts. A Logical Mining Unit, LMU application was submitted to BLM in the fall of 1994 requesting the combination of the five federal leases controlled by Powderhorn. This LMU boundary is shown on Exhibit 5. Mining projections in the application include mining in Sections 32 and 33, T10S, R98W, 6th PM. No mining was performed in these sections. The Roadside North and South Portals were developed using three to seven entries for all mains and sub -mains, and three entries for panel bleeders. The entries Is were eighteen to twenty feet wide. Entries were developed on 50 to 120 foot centers and crosscuts developed on 50 to 200 foot centers depending on the mining conditions. Room and pillar panels were developed using three to six entries. Rooms were driven perpendicular to these panels up to 600 feet from the centerline of the panel or to within 50 feet of the property line. Pillar extraction, where used, utilized pillar slabbing procedures similar to wing and pocket recovery. Continuous haulage panels were driven using four to seven entries and generally had crosscuts mined on 60° angles. Resin roof bolts were the primary means of roof support. The use of cribs and wood posts were used as secondary means of roof support. MSHA approved roof control plans were followed at both mines. . The primary means of ventilation for both mines was exhaust fans. Separation of the air flow between the intakes, the belt, and the return entries was made using Volume 3 Tab 12 12-1 5/00