Appeal: Air-quality OK for mine flawed

Rosemont Mine opponents claim in an appeal that Arizona's environmental agency approved an air quality permit for an outdated mine plan and overlooked the likelihood of air quality violations.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 gets key air permit from state

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.

Asarco unit to pay $110K to settle mine spill charges

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.

Just add water: AZ pushes for 'bioreactor landfills'

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…

Just add water: AZ pushes for 'bioreactor landfills'

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.

Just add water: AZ pushes for 'bioreactor landfills'

This is the existing methane-capture system and part of the Los Reales Landfill gas-to-energy project. Bioreactor opponents are worried about additional water use and the threat of groundwater contamination.

Just add water: AZ pushes for 'bioreactor landfills'

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.

Enviros: Put TEP plant under haze rule

Environmental groups want federal regulators to place a partly coal-fired power plant in Tucson under regional regulations designed to curb regional haze.

Enviro groups go after Tucson's partly coal-fired power plant

Environmental groups want federal regulators to place a partly coal-fired power plant in Tucson under regional regulations designed to curb regional haze.

ADEQ head to EPA: Let state 'figure out' air quality issues

PHOENIX - The Environmental Protection Agency and Arizona have a common goal of following the Clean Air Act, but federal officials should recognize the "unique environment" here as they evaluate plans, a state official contends.

Ariz. proposes issuing air permit for Rosemont Mine

State regulators are taking over the Rosemont Mine air quality permit from Pima County, the Arizona Department of Environmental Quality announced today.

Marana loses latest bid to control sewer plant

The Arizona Court of Appeals rejected Marana's motion to reconsider an earlier decision that the town does not have the legal authority to own or operate the sewer plant it seized from Pima County.

Court OKs settlement over hazardous waste at AZ mine

U.S. District Court for Arizona has approved a $6.8 million settlement that Phoenix-based Freeport McMoRan will pay over the past release of hazardous substances from the Morenci mine.