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Magnesium chloride was sprayed on 1. 2 miles of the county <br /> road southeast of the Robinson tailing pond at a 50% solution <br /> and the manufacturer ' s rate . Cost of the delivered and <br /> applied product was $0. 14 per square foot or approximately <br /> $6 , 100 per acre. The dust control efficiency appears to be <br /> comparable to Coherex. However, when compared to the <br /> approximate $330 per acre cost of Coherex, magnesium chloride <br /> is not cost-effective. <br /> The overall effectiveness of the 1987 dust suppression <br /> program at the Climax Mine is considered by AMAX to be <br /> excellent. This evaluation is particularly valid considering <br /> the abnormally long and dry snow-free period during the year. <br /> The faces of the dams , generally considered the most severe <br /> wind-blow areas, were treated for only the second time in the <br /> 12 year history of the control program. Should the products <br /> on these faces maintain their integrity over the winter, the <br /> 1988 dust control program may be less extensive and less <br /> expensive than 1987. This situation will be evaluated at <br /> snow-melt in 1988 and monitored throughout the snow-free <br /> period. <br /> Ultimately, the faces of the tailing dams will be stabilized <br /> with rock blankets and the pond flats will be covered with <br /> top soil/vegetation and/or rock. However, until a permanent <br /> solution is effected , Climax will continue to make every <br /> effort to control blowing tails in a practical , effective, <br /> and responsible fashion. <br /> -3- <br />