Laserfiche WebLink
The pumping of the Corley Well and North Entry Well are accounted for in <br />the water analysis of the mine and preparation plant. Because of the <br />complexity of the old mine workings in the area. and the potential <br />connection to the stream system. it is anticipated that historic and <br />current mining and pumping operations in the area have already affected <br />the ground water discharge to the stream system. Figure 9 illustrates the <br />relationship of the wells and coal seams to the ground surface and the <br />surface water system. <br />Coal Preparation Plant <br />The coal preparation plant uses water for coal washing and separation. but <br />a large portion of this water is recycled continuously during plant <br />operation. The amended records for 1985 were analyzed to determine the <br />amount of water used by the coal preparation plant. As shown in Table 3. <br />the total amount of water entering the preparation plant system on raw <br />coal annually. approximately 47.7 acre-feet. ie supplemented with 7.3 <br />acre-feet annually. The total amount of water leaving the preparation <br />plant system with the clean coal. refuse. and other water uses for outside <br />washing and Black Water Pond evaporation. is equal to the total amount of <br />water entering the system. or X5.0 acre-feet annually. Moisture contents <br />of the various products entering and leaving the preparation plant were <br />obtained from sample analyses provided by mine personnel. Appendix C <br />discusses the methodology used for the numbers calculated above. <br />The water brought into the preparation plant on raw coal equals 15 percent <br />of raw coal by wet weight. This water consists of specific retention. or <br />water which will not drain by the force of gravity alone (see Appendix B <br />for a detailed explanation of specific retention). and water remaining on <br />the raw coal from inside-mine duet suppression requirements. The removal <br />of the portion of water retained on the raw coal which ie specific <br />retention does not impact downstream water rights. but that portion of <br />incoming water which is remaining from underground duet suppression <br />requirements is consumptive use and ie described in the section below on <br />- 17 - <br />