First hearing held yesterday in a US federal court of a legal action by various environmental groups (including the Sierra Club) to stop expansion at a large open cast copper mine on the grounds of air pollution.
The groups believe expansion is a violation of the US federal Clean Air Act, calling into question the interpretation of the Utah State Implementation Plan or SIP. The SIP is a complex plan of control regulations and emissions limits agreed upon by the federal US Environmental Protection Agency (USEPA) and Utah’s Division of Air Quality (DAQ) (the applicable state government department for air quality control).
U.S. District Judge Robert Shelby did not make a ruling on the case. He said he would seek advisement.
Here is The Republic, Columbus, Indiana news article that gives detail.
Here is the information posted by the mining company about this.