2009-02-02_REPORT - C1981018 (3)

Home Browse Search

TABLE 2-2 MINE WATER BALANCE WATER IN GALLONSNR GALLONS/MIN Production Equipment 35,199,600 66.97 Ventilation Humidity 9,230,434 17.56 Underground Storage of Thickener Water 3,700,000 7.04 Incidental (pipe leaks, road watering, wash down) 3,519,960 6.70 TOTAL 51,649,994 98.27 WATER OUT Coal Surface Moisture 21,293,528 40.51 Ventilation Humidity 19,250,838 36.63 Pumped Out 0 0 TOTAL 40,544,366 77.14 Water Left Underground 11,105,627 21.13 Water pumped from B seam to D seam 7,358,400 14 In-going Water The production equipment utilizes water for dust control and cuttings removal in roof bolting. Water used by equipment is based on 469 shifts worked by continuous miner sections and 296 shifts worked by the longwall. The continuous miner sections use 100 gpm and operate about 3 hours per shift (the rest of the time is spent moving, etc.). The longwall equipment uses 150 gpm of water for about 7 hours per shift. The amount of water entering the mine as ventilation intake air humidity is based on monthly mean temperatures from Table II.C-1 on page II.C-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 433,838 cubic feet per minute. Thickener water transferred underground for storage was estimated at 3,700,000 gallons during the reporting period. This number is based on operational knowledge of the tons washed and other factors such as the type of clays encountered, processing equipment efficiencies, etc. The smallest quantity of water entering the mine is the incidental category. This category includes leakage from water lines, dust control watering in the haulage entries, and 9