Toxic heavy metals may have leached into the water during heavy rains.
Federal regulations will cut sulfur dioxide emissions 85 percent at the smelters.
Lab results from San Pedro River water in Mexico not yet known.
Phoenix car wash mogul pleads guilty; Asarco to pay Arizona fine; more.
Duncan and Connie Creed say they no longer can enjoy the glow of sunsets in their backyard like they could when they moved into their Green Valley house 11 years ago. The reason, they say, is the stand of mine tailings just west of their home that towers like a huge mesa over the community.
A community group and a retired air-pollution scientist filed separate lawsuits Wednesday challenging Arizona’s approval of an air-quality permit for the proposed Rosemont Mine.
Don’t worry, the Rosemont Mine isn’t likely to pollute the well-loved Davidson Canyon or Cienega Creek southeast of Tucson, says the Arizona Department of Environmental Quality.
Last Monday, Coronado National Forest Supervisor Jim Upchurch answered questions at a news conference about the Rosemont Mine.
The U.S. Forest Service will issue a draft decision today approving the proposed Rosemont Mine in the Santa Rita Mountains southeast of Tucson.
The Forest Service laid much of the groundwork Friday for approval of the Rosemont Mine by releasing a final environmental report saying essentially that while the mine will cause negative impacts, it’s now clearly in line with nearly all environmental laws.
Whether you are in favor of Rosemont Copper or opposed, your decision ought to be based on the most current facts.
The U.S. Bureau of Land Management is intensifying the debate over the proposed Rosemont Mine’s impacts on neighboring streams by bluntly challenging the Forest Service view that the mine probably won’t do major, short-term environmental damage to Cienega Creek.
Opponents of the proposed Rosemont Mine have filed suit, seeking to overturn a state decision awarding a groundwater protection permit to mine owners Rosemont Copper Co.
Opponents of the proposed Rosemont Mine are 0 for 3 in trying to stop the state from issuing the mine a groundwater-protection permit.
Rosemont Mine opponents claim in an appeal that Arizona's environmental agency approved an air quality permit for an outdated mine plan and overlooked the likelihood of air quality violations.
Rosemont Copper now has one of the most hotly contested permits - although not the last needed - for it to operate a mine southeast of Tucson.
An Asarco mining operation has agreed to pay a $60,000 fine and take preventive steps valued at $50,000 to resolve water quality violations caused by a June 2010 pipeline spill at the Silver Bell Copper Mine near Marana, the Arizona Department of Environmental Quality announced today.
Chad Hancock, a technician with Engineering and Environmental Consultants Inc., uses a device to monitor the amount, concentration, temperature and percentage of methane gases from a well at the Los Reales Landfill. Wells are connected to vertical perforated piping that runs throughout the l…
The Arizona Department of Environmental Quality is seeking federal permits to convert landfills like Los Reales to bioreactors. The addition of water to the landfill is expected to accelerate the rate of waste degradation, creating more methane.
More liquids - and, critics fear, some illegal hazardous wastes - could be coming to Arizona's 39 garbage landfills if a new technology for treating landfill liquids wins federal approval.