Formula 1
Annual acres mined = Average Annual Production / (Thk)x(___tons/ac. ft.)x(RR)
Formula 2
Tons/ac.ft. = (62.4 lbs.water/ft3)x(__lbs.resource/1 lb.water)x(43,560 ft2/acre)x(1ft thickness) / 2000 lbs./ton
Formula 3
$/ac = (Thk)x(___tons/ac. ft)x(RR)x(Roy)x(M) / ML
W. Va. Code R. agency 110, tit. 110, ser. 110-01K, app A