2013-05-10_REVISION - M1977193 (3)

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horizontal (1 %) bench tops to direct surface flow from storm events to the outer portions of the bench system in proximity to main storm flow drainage channels. Maintenance activities along the bench may involve removal of any material that may accumulate over time along the back of the bench top or small slabs of rock that may become dislodged from the rock face. This work will likely be accomplished using a small track hoe or crane with ample reach to remove loose material while maintaining a safe distance from the bench edge. The first ten acres (660'x660') of highwall mining in the lease area will result in an east - facing highwall along the west boundary of the lease area and a south facing active highwall that will continue to move northwards in time as mining continues north along the 3000' length of the lease area. At final build out, there will be at least two locations where highwalls intersect at 90 degrees. These areas may be left armored with rock talus to promote controlled storm- related water flow with the least potential for highwall destabilization due to short-term but potentially high - volume surface water flow. Rock placement may be utilized in other locations where storm- related surface flow potentials or unstable bedrock zones are encountered. Equipment Used on Tunnel Drive Mine Site General Type Number Front End Loaders 10 yard to 3 yard 4 Bulldozers 500 -700 HP 3 Excavators 1 -4 yard 2 Percussion Drill 500 HP 1 Water Truck 4000 gal 1 Jaw Crusher w/ feeder 1 Cone Crusher 1 Screen Decks 2 Conveyor Systems 10 Pick -up Trucks 6 Service Trucks 2 All mining and process operations are performed in accordance with a site fugitive dust program approved by the Colorado Department of Health Air Quality Control Division for site and process equipment dust control. Stockpiles of crushed aggregate are kept wet to minimize fugitive dust during loading and haulage operations. Highway trucks are used to transport product from the site. In accordance with Technical Revision 9005, approved by DMG in 1996, the operator may have an asphalt batch plant on site for the manufacturing of asphalt road materials. Such a plant will meet all requirements for air pollution control regulations and may be onsite periodically or as a permanent component of the production facility. Also in accordance with TR #005, the operator may have a stockpile of up to 200 tons of waste concrete and/or asphalt road material which will be used in a recycling operation resulting in reprocessing of these materials into additional road base or asphaltic products. In accordance with Technical Revision #002, a gravel washing /screening procedure may be employed on the site.