2015-09-03_PERMIT FILE - C2010089 (6)

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dozers regrade the spoil overburden into the original contour. Lower overburden is usually cast blasted where approximately 25% of the overburden is cast into its final position in the backfill. The remaining shot overburden is loaded with a shovel and taken to a designated stockpile or placed behind the pit for backfilling. The exposed coal is loaded with a shovel into over -the -road haul trucks which take the coal to the nearby power plant in Nucla operated by Tri-State. The anticipated mining schedule for each area where mining will occur is graphically shown on Map 2.05.2-1. A cross section of the typical pit is shown on Map 2.05.3-1. Coal removal at NHN Mine is expected to begin in mid -2013 and continue through 2020. The coal quantities required from the NHN Mine under Western Fuels -Colorado's contract to supply Tri-State Generating and Transmission Associations' Nucla Station are estimated to be about 250,000 tons to 460,000 tons per year. For purposes of this permit application, the maximum rate of 460,000 tons per year was assumed. Whenever possible, overburden stripping and coal loading will be sequenced to maintain an in -pit inventory of approximately one month's coal requirements. Additionally, overburden stripping and coal loading will be sequenced to allow blending of coal in the pit to enable delivery of relatively uniform quality coal to the power plant. TABLE 2.05.2-1 MAJOR MINING EQUIPMENT NEW HORIZON NORTH MINE, MONTROSE COUNTY, COLORADO PRIMARY EXCAVATION EQUIPMENT Equipment Type Quantity Capacity Hydraulic Shovel 1 20 cubic yards End Dump Truck 4 100 tons Crawler Tractor 2 400 horsepower Crawler Tractor 1 770 horsepower MAJOR SUPPORT EQUIPMENT Equipment Type Quantity Capacity Overburden Drill 1 6-3/4" diameter Wheel Loader 1 7 cubic yards Motor Grader 1 200 horsepower Water Truck 1 9,000 gallons Section 2.05.2 Page 2 August 2015 (MR -15)