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1 <br />mining flow for relatively short periods (hours or days), in the form of profuse drips, and then <br />gradually dry out as the flow stops and the ventilation air carries the moisture out of the mine. <br />These areas are generally associated with stackrock in the roof. Stackrock is a sandstone laminated <br />with very thin layers of silty carbonaceous material. These laminations range in thickness from a <br />iew inches to a few millimeters thick. Water in the stackrock appears to be connate in origin and <br />not from the rechargeable groundwater systems. Additional water enters the mine from the <br />surrounding strata from broken rock in the gob behind the longwall face. <br />I The smallest quantity of water entering the mine is the incidental category. This category includes <br />leakage from water lines, dust control watering in the haulage entries, and washdown water used <br />' in the slope and other locations. <br />Outgolny Water As coal is mined, it is wet by dust control sprays on the continuous miners, the <br />longwall shearer and at transfer points along the conveyor belt system. This water is then carried <br />out of the mine as surface moisture on the raw coal. This added coal surface moisture represents <br />' a 29'° increase in the raw coal moisture content. The raw coal tonnage produced during this <br />reporting period was 1,655,731 tons. <br />' Water leaving the mine as ventilation humidity represents a large quantity in the water balance. The <br />temperature of the exhaust ventilation air is almost constant, ranging from 60° in winter months to <br />63°F in summer months. The relative humidity of this air ranges from 80% in the summer to 959'0 <br />in January and February. Throughout the year, except for the months of June, July and August, the <br />ventilation air is warmed as it passes through the mine. This increases its moisture carrying capacity <br />' and the air picks up considerable quantities of moisture wherever there is water available. During <br />the summer months the air is actually cooled, however, the difference in relative humidity still allows <br />' the exhaust air to carry away more moisture than is brought in with the intake air. <br />Some of the water entering the mine is collected in sumps at various locations. In the past, this <br />water was eventually pumped out of the mine through the East Intake or to process pond two (PP2). <br />All water discharged from the mine is now discharged at SDH-2. <br />' 2.3 Red Wash Alluvial Monltoring Program <br />1 Portions of Red Wash have experienced subsidence due to longwall mining at the Deserado Mine. <br />As required by CMLRD, Western Fuels initiated a detailed hydrology monitoring program in Red <br />Wash above the first longwall panel to be mined. The monitoring program consists of nine (9) holes <br />drilled in the Red Wash alluvium across the predicted zone of subsidence from longwall panel 1 <br />(LW-1). Water levels in the holes were monitored before, during and after active subsidence took <br /> <br />1 <br />13 <br />1 <br />