Changes

The proposed controls would reduce emissions of nitrogen oxides from about 45,000 tons per year to 9,000 tons per year, and improve both public health and visibility at 16 national park sites in the area, the EPA stated.<ref>[http://www.businessweek.com/ap/financialnews/D9IMRMEG0.htm "EPA proposes nitrogen oxides reduction at NM plant"] Sue Major Holmes, Bloomberg, October 7, 2010.</ref>

In early November 2010 a federal judge voided a permit for the expansion of operating permit for the [[Navajo mine]] located on the Navajo reservation in New Mexico. It was one of two mines at the location that has sought expansion permits. The judge called for a more thorough review of the project’s impact on the environment and on cultural sites.