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Seneca Coal Company MSHA I.D. OS-00304 Highwall Mining Addendum March 15, 2004 • The coal mined by the highwall mining system will be moved to either a storage azea or to a truck dump station for shipment on the Overland Conveyor. Coal haulage will be from the stacker conveyor stockpile and from either direction from the highwall mining system. Loading of coal shall be performed by Seneca's loader and by haulage trucks Haulage trucks will try to maintain at least 25 feet from the highwall 5. SHM Idled If for any reason the SHM needs to be idled for an extended period of time, the SHM will be removed from the opening and backed away from the highwall for at least 50 feet. 6. Hole Completion /Closure After the mining process in each entry has been completed and the machinery moved to the to the next entry, Seneca Coal Company is responsible for blocking the entries with suitable fill material. The maximum amount of openings that will be left open from the current active opening will be limited to ten openings so that visual inspection of their performance can be attained. E. Ventilation Methane -The miner has a methane monitor system that is approved by the Secretary and is displayed at the operator's station indicating percentage ofinethane/air mixture. Methane concentrations aze continuously displayed on a monitor in the operator's compartment. This system is designed with a monitoring system that gives a warming at 1 % methane concentration and automatically de-energies the miner should it be exposed to a methane concentration of 2% or greater. Seneca Coal Company does not anticipate high levels of methane. (a) If an indicator is indicating 1 % methane, the cutter head will be lowered to the center of the seam, and the machine shut down. All launch personnel will be removed from the immediate area, and a methane examination will be conducted at the cut opening. The conveyor system will remain in operation. Internal combustion engines will not be operated in the vicinity of the highwall mining opening during the surface methane examination. (b) Methane levels aze digitally displayed in the operator's compartment. When methane levels at the cutterhead have dispersed, another methane examination will be conducted at the cut opening using an extendable probe. Work will be able to continue as long as methane levels remain below 1%. (c) If methane levels in excess of 1 % are encountered a second time while mining a cut, procedures (a) and (b) above will be repeated.