2017-01-30_REPORT - C1981018 (2)

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2.2.1.5 Mine Water Balance Table 2-2 shows the water balance for the Deserado Mine. No water was pumped from underground workings between January 1996 and May of 2012. Pumping of excess mine water to the surface recommenced in May 2012. During the 1996-1997 period, Deserado Mine started disposing the prep plant thickener water in the mined out area of the D -Seam (the first longwall district). This water would have been otherwise discharged through Pond PP -2. Incloina Water The production equipment utilizes water for dust control and cuttings removal in roof bolting. Water used by equipment is based on 240 shifts worked by continuous miner sections and 235 shifts worked by the longwall. The continuous miner sections use 100 gpm and operate about 4 hours per shift (the rest of the time is spent moving, etc.). The longwall equipment uses 200 gpm of water for about 8 hours per shift. The amount of water entering the mine as ventilation intake air humidity is based on monthly mean temperatures from Table II.0-1 on page II.0-5 of the Mining Permit and the yearly mean relative humidity of 56% found on page II.E-1 of the Mining Permit. The absolute humidity, the actual amount of water in the air, is calculated from these data using an average ventilation quantity of 443,104 cubic feet per minute. TABLE 2-2 MINE WATER BALANCE WATER IN GALLONSNR GALLONS/MIN Production Equipment 28,320,000 53.88 Ventilation Humidity 9,427,572 17.94 Underground Storage of Thickener Water 1,800,000 3.42 Incidental (pipe leaks, road watering, wash down) 2,832,000 5.39 TOTAL 42,379,572 80.63 WATER OUT Coal Surface Moisture 13,662,927 25.99 Ventilation Humidity 19,661,987 37.41 Pumped Out — B -Seam 14,309,089 27.15 Pumped Out — D -Seam 107,129,000 203.82 TOTAL 154,763,003 294.45 Net Water Removed From Underground 112,383,430 213.82 Water pumped from B seam to D seam 0 0 0