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Cross -Section 1. Appropriately sized berms are maintained at the crest of the highwall <br />as necessary to protect any equipment operating in the adjacent areas. <br />The truck and loader fleet, removing overburden and partings, works from flattened to <br />mildly cross -sloped (<_8%) bench areas. Material is pushed down to these benches <br />with bulldozers working above and dozing downhill approximately perpendicular to the <br />slope. Once pushed to the bottom, the material is loaded out and hauled away with the <br />truck and loader or truck and excavator equipment available. <br />Dozers may be used to push material from above the coal into the previously mined cut <br />to backfill the previous cut and aid the other prime movers in uncovering coal. <br />Drilling, blasting, and related support equipment are utilized as necessary in advance of <br />the dragline and/or Truck/Loader strike line mining activity. <br />Dipline Mining with Draglines: This mining method exposes coal seams by <br />developing successive cuts oriented along the dip (approximately perpendicular to the <br />contours) of the coal (see Cross -Section 2). Dozers may assist with stripping operations <br />on shallow partings by pushing interburden materials along the strikeline from the <br />highwall side into the open pit. Spoil from the dragline cut is either cast adjacent into <br />the previous open cut or stacked on previously backfilled areas. Pit floors are prepared <br />as necessary to ensure spoil stability is achieved. Exposed coal in the dragline dip cuts <br />is mined by operating excavating and hauling equipment in successive cuts or slots <br />oriented along the dip of the coal or by dozing or stacking the coal at the toe of the <br />exposed coal seam on the down dip side. Exposed coal seams may also be mined with <br />equipment operating along the strike of the coal. In this case, flattened to mildly cross - <br />sloped travelways are established for the haulage equipment. Protective berms are <br />utilized if necessary on any elevated roadways or ramps that equipment may travel on. <br />Spoil materials adjacent to the active cut are placed with outslopes ranging from <br />1.33H:1 V to 1 H:1 V. Highwalls are developed to utilize safety benches as depicted on <br />Cross Section 2. Overall highwall slopes are maintained at <700 as shown on Cross <br />Section 2. Appropriately sized berms are maintained at the crest of the highwall as <br />necessary to protect any equipment operating in the adjacent areas. <br />Historic Landslide: <br />A major landslide occurred in the east panel on October 8, 2006. The slide <br />encompassed approximately 250 acres, bounded on the east by Gatling Pit cut Gd02 <br />(which is now called L -Pit) as depicted on Ground Control Plan Map 1. This area has <br />been fully developed and mining operations completed, and is currently being backfilled <br />and graded. Therefore landslide monitoring of the area is no longer being conducted. <br />However, spoil stability and pit endwalls will continue to be observed until backfill <br />operations are complete. <br />ACCEPTED/FILED <br />AUG 2 6 2016 <br />CMSH-DISTRICT 9 <br />S:\GROUND CONTROL\January 2016 GCP Revision\Trapper_ GCP_Jan2016_DRAFT1.docx Page 13 <br />