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2 . 03 .8 Page 2A <br /> MINE LIFE (ADDENDA) <br /> Life of the King Coal Mine , La Plata County, Colorado is <br /> estimated at approximately 262 months . Mine life is based on <br /> most recent reserve estimates and projected annual production of <br /> 175 , 000 t.p.y. Date of reserve estimate is November 30 , 1989 . <br /> Reserves , including all section pillars, but excluding main <br /> entry pillars and barrier pillars, total 3 , 818 , 450 tons . Reserve <br /> estimates are based on 504 acres underlain by mineable coal in <br /> the upper seam, a seam thickness of 5 . 6 ' and a tonnage factor of <br /> 1800 tons per acre foot . <br /> Reserves are calculated from current mine maps and seam <br /> thicknesses provided by National King Coal , Inc . Main entry <br /> pillars are not included in reserve estimates , as these would be <br /> retained to allow possible future access to adjoining coal <br /> leases . <br /> ed M. Joh , C.P.G. <br />