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i TABLE E51-25-SIMVLIFIED WATER BALANCE YEAR 200] 2008 2009 2010 2011 2012 2013 PRODUCTION LEVEL MMTONS CLEAN 11,5 10.1 11.] 12.0 11.0 9.6 8.4 WATER BALANCE CATEGORY S stem In uffi Macro- t ~ M~ 4*_"A=:[. ~.e€s.~€`~ f" - Mine IMlows' (SOUthem antl Western Minin DrsMCfs bye6.1 55/88.] 55/88.1 55/88.7 55/88.7 55/88.7 55/88.] -Mine In8ow5' Eastern Minin District 65'104.9 fi5I104.9 65/104.9 65/104.9 65H 04.9 65/104.9 BSH 04.9 - Mina Inflows' (NpUam Muting DuVict - Includes SMN/6MN Intake Shafts 95ri53.2 95!153.2 95H 53.2 9&153.2 9&153.2 95/153.2 95x153.2 -Mine In8owsl (NaM Mains antl PoRap 10/16.1 10/18.1 10/16.1 10/18.1 10/16.1 10/tfi.1 10/18.1 -Potable Wafer Well 4/6.8 4/6.8 4/6.8 4/6.8 4/8.8 d/6.6 4/8.8 - O rational Use Fran Pond A '/163.6 •/163.6 '/183.8 •/183.6 •/163.fi •!163.6 •/183.8 -Su Iemental Water From OR54e t Ne fi ible Ne li ide Ne li ible N G ible N li ible N II ible N li iNe Subtotal 6 stem In ub acre- r 533.3 533.3 533.3 533.3 533.3 533.3 533.3 S stem O uffi Mac " k.`icsz-'~ "3v - s= """"`°"'""' - Surace Moisture Coal Shi menu ° 164.6/285.5 153.2/241.1 16].&210.2 1fl.8R77.1 15].5254.0 13].&221.8 120.3!194.0 - Mine Ventilation Lasses See Notes' '/68.8 '/fi8.8 '/68.8 '/88.8 •/88.8 '/fi8.8 •/88.8 -Surface DUSt DalirOl 11/1].] 11/1]] 11/1].] 11/1].] 11/17.] 11/1].] 11/1].1 - Washdovm Water Pontl B '/3.8 •/3.8 •/3.8 '13.8 'B.8 •/3.8 '/3.8 Pontl C 70.6 •/0.6 •/0.6 '/0.8 '/0.8 •/0.8 •/0.8 Pontl D '/0.5 •/0.5 •b.5 'b.5 'b.5 •/0.5 70.5 Pontl E '/1.9 •/1.9 •/1.9 •/1.9 '/1.9 71.9 '/1.9 - Eva relive Losses All Active Pontls ° •/14.0 '/14.0 •/14.0 '/14.0 '/14.0 •/14.0 714.0 Subtotals stem Ou ub acro- 312.8 354.4 317.5 384.4 381.3 328.1 301.3 Chan a In Stora'e adie~ ' •- ..`-.. 117{;.160:5e. €~178!9 'QR}•-155.8>Frya ~~„148.97 s172b 2lb .. Nobs: General - Inputs to Twentymile Coal Canpanys (TCC) water system are primarily groundwater inflows to the active mine workings, Wih Na excep5on of the System outputs identifietl, all water u recycletl and reused within Ue mina water system. AStedak denotes value not ava0able. ~ - Due m Me tlip A Ne coal seam, and the mining method (bngwall mining updip), ground water inflow b Ne active robe workings antl minetlauT areas b generelty intercepted by Ne active woRdngs (torten! active panel antl tlevebpmenl wokings) and ranwina relatively oonsbnt t -TCC occasabnalty has supplemental water bucketl-in from offaib b meet sPaciBC opemtlOnal neetls. Tllu tloee nM occuffrequendy and the Quantities ere noI significant ° - SuRace moisture loss calculation basetl on 2/3 of production passing trough washplanl, with output of 3.] percent surface moisWre, and remalnirg 1/3 0l produc8on et surface moubre o(2.0 percent • -Moisture loss occurs Through mina ventilation due to an increase b raWtiva humidity az vanebtlon air passes through the mine. Given, howevor, that Na increase in relative humitlRy is due b evaporation of grountl water within the mina, the moiswre lass does not represent a surface water depletion. ° - 8asetl on maximum (tool) Pontl surface area of aporoximately 40.9 acres antl average annual evapaatbn rates from NOM evaporation maps ° -Given that all system inputs are recycletl, with the exception M the identified system outputs (bsses or tleple8ons), the d'Merence belwean inWb aM outputs represents a net change in system storage. Water is curtentty (200]) stored underground in the Southern and Eastem Mining Districts (capacity about 2,540 acre-fI), an aboveymuntl in edher a both of Ne Mro millbn-gallon storage tanks antl in Na Area 1 Pit. In the future, the Eastem Mining DisVici will be dewatereQ antl Thu wafer along with incremenrel storage from ongoing operetlens will be storetl in the souNem portion of the Wesrem Mining Diseict (capac'4y about 1,410 acro-8). TRO]-59 Table E51-25 04/02/0]