2013-02-01_REPORT - C1981018 (2)

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WATER IN GALLONS/YR GALLONS /MIN Production Equipment 34,440,000 65.53 Ventilation Humidity 9,018,477 17.16 Underground Storage of Thickener Water 4,750,000 9.04 Incidental (pipe leaks, road watering, wash down) 3,444,000 6.55 TOTAL 51,652,477 98.27 WATER OUT Coal Surface Moisture 18,426,510 35.06 Ventilation Humidity 18,808,785 35.79 Pumped Out 5,241,600 9.97 TOTAL 42,476,895 80.82 Water Left Underground 9,175,582 17.46 Water pumped from B seam to D seam 8,424,000 16.03 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. Ingoinq Water The production equipment utilizes water for dust control and cuttings removal in roof bolting. Water used by equipment is based on 365 shifts worked by continuous miner sections and 268 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 408,438 cubic feet per minute. TABLE 2 -2 MINE WATER BALANCE Thickener water transferred underground for storage was estimated at 4,750,000 gallons during the reporting period. This number is based on operational knowledge of the tons 9