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Notice means the Center for Biological Diversity may sue in 60 days if they don't get favorable agency decisions on the mine.

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An approval or denial of the mine's Clean Water Act permit could trigger an Environmental Protection Agency intervention or a company appeal — both lengthy actions.

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But cutting down on CO2 emissions can reduce severity, study says.

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Mine owner says new plan would protect an additional 1,200 acres.

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UA's journalism school chief says the agency's action raises questions about what it's trying to hide.

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But local utilities don't foresee problems this weekend.

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  • By Tony Davis Arizona Daily Star
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Chances of a future jaguar population in Arizona extremely slim, official says

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Site near Tucson is only place in U.S. or Canada where jaguar, ocelot, puma and bobcat have all been photographed.  

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Cuts would reduce the unused water cities can store for a drier future. Farms would be hit, too.

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A warming climate could have brought the pine flycatcher and numerous other Mexican bird species into Arizona in increasing numbers.

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A male jaguar was photographed in the Santa Rita Mountains 118 times over three years.

  • Tony Davis / Arizona Daily Star

The declining water levels in Lake Mead reveal a “bath tub ring” on the surrounding rocks and shoreline, as seen from Hoover Dam in Arizona on…

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More lost in typical July than flows from Lake Powell to Lake Mead in average year.

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The reservoir stores Tucson and Phoenix's drinking water from the Colorado River.

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But two other federal agencies have criticized the computer models used.

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Rosemont report is the latest of more than 6,800 such opinions, it finds.

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But mine opponents vow to challenge conclusions of the mine's Final Biological Opinion in court.

  • Tony Davis Arizona Daily Star

The mine's lowering of the water table for creating the open pit southeast of Tucson could or would dry up a stretch of Empire Gulch, the report says.

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Forest Service decision could come as early as mid-May.

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  • By Tony Davis Arizona Daily Star

Southern Arizona’s copper industry outlook remains bleak due to the continued slump in global copper prices.

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For first time, California may also commit to big cuts in its Colorado River use.

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But it's still not clear when the federal government will decide on the controversial, $1.5 billion mine.

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Company says it's confident of finding another clean-energy provider if that happens.

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The April-July forecast for Colorado River runoff into Lake Powell is 74 percent of average.

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But California officials say the legislation that Arizona water officials want is unneccessary and counterproductive.

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But California officials say the legislation that Arizona water officials want is unneccessary and counterproductive.

Executives share conservation success stories.

But excluding tribes from Colorado River talks is wrong, Gila River Tribe says.

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Officials tied to SunZia say concerns aren't justified.

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The finding is ominous for the region's future drinking-water supply.

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Hudbay won't say when it hopes to start construction.

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The runoff forecast for April through July is 80 percent of normal.

But Arizona water department chief says panel is fine as is.

A map for the story on Page A1 Sunday, "Plan takes water out of Santa Cruz here," inaccurately showed locations of where treated wastewater cu…

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  • By Tony Davis Arizona Daily Star

U.S. would divert effluent from lush river span for Tohono O'odham.

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The technical basis for that water law seems shaky.

  • Tony Davis / Arizona Daily Star

This stretch of the Santa Cruz River north of Tucson could lose its effluent water supply..

They tackled big picture subjects without sounding wonkish -- "doing it in a living way."

The natural world helped Krista Schlyer accept the reality of a loved one's death.

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"The southern regions of the Western U.S. must be prepared to adapt to a much drier future," UA researcher says.

  • Tony Davis / Arizona Daily Star

“The Oxbow” on the Santa Cruz River from the Sanders Road bridge north of Tucson on Feb. 19, 2016. Tony Davis / Arizona Daily Star

  • Tony Davis / Arizona Daily Star

The Oxbow is a mile-long stream that cuts away from the main river before rejoining it. It’s a bird-watching hot spot and draws lots of other …

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  • By Tony Davis Arizona Daily Star

The ACC's vote split 3-2 on the $2 billion, 515-mile-long project to run near the San Pedro River.

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  • By Tony Davis Arizona Daily Star

Arizona Corporation Commission is expected to vote Wednesday on the proposed power line project. 

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Power-line proposal goes before the Arizona Corporation Commission on Tuesday.

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But overhauling rate structure in response to conservation a year off.

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  • By Tony Davis Arizona Daily Star

Timothy Thomure discusses the possibility of recycling waste water

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Proponents say the project's impacts can be lessened.

But ADWR will be far short of its pre-bust staff totals.

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The Colorado isn't running low on information about water supplies.