"… �s fence.Asarco has long maintained — and the state concurs — that the Hayden smelter is not a “major source” of hazardous air pollutants, a designation tha …"

"… ors for years.A 1980 memo by a state environmental official noted that the Hayden smelter has “problems with lead and arsenic fumes during their process because o …"

"… r ore from the Ray Mine since 1880. Asarco began processing the ore at its Hayden smelter in 1912, turning out 800-pound slabs of nearly pure copper called anodes.� …"

"… implications. In its Nov. 10 finding of violation, the EPA argues that the Hayden smelter has been a major source since June 13, 2005, the date a federal pollution- …"