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rHe rvorwesr croup <br />.~ <br />~n,s.,•~I ~ `~ <br />Rc~ourcc <br />Consulla NS, Inc. <br />Suite ?00 <br />?970 Sowh Alnin Si reel <br />Salt Lake City, Ulah 54115 <br />(SOU 466-9645 <br />September 10, 1990 <br />Mr. E. Peter Matthies, President <br />NEW CASTLE ENERGY CORPORATION <br />7476 East Arkansas Ave. #104 <br />Denver, Colorado 80231-2562 <br />Subject: Surface Preparation Facilities <br />for Underground Hvdraulic Mine <br />Confirming our telephone conversation of the above date, the process flowsheet <br />(drawing number 1302-SC-001) selected for your mine product is a "closed loop system." <br />All the fine coal below 100 mesh in size will pass to the thickener for concentration. <br />The thickened underflow will be pumped to the belt presses for further dewatering <br />and the press cake will be discharged on to the coal collection conveyor. The water <br />overflowing the thickener will be of sufficient clarity for re-use within your facility. Hence <br />your coal dewatering system will only have two products, coal to be transported to market <br />and water which will be re-cycled. <br />NCEC will of course have to provide the normal system of run-off collection ditches <br />with a sediment pond around the facility to contain any stockpile and area run-offs. <br />The emergency flume bypass settlement basin if used, will have an adjustable decant <br />overflow to the sediment pond. Solids from the basin will be reclaimed by front end loader <br />and discharged into the dewatering plant. Any "black water" in the sediment pond will also <br />be re-processed by pumping to the dewatering facility. <br />If you have any more questions please feel free to call, I will be happy to assist you <br />whilst Messrs. Symonds and Moizer are away from the office. <br />Sincerely, <br />NOR~WEST 'RESOURCE CONSULTANTS, INC. <br />C3rt~r~i1~I -~ G~n.~ <br />David Bingham ~./ <br />Senior Engineer <br />DB/jm <br />orrees .n <br />CafFary, Albcrla. Canada <br />Jokarla, Indonesia <br />