A machine called a rake is used in the harvesting of pecans from the groves owned by Farmers Investment Co., one of the two entities that want to connect to the water source at the end of the Central Arizona Project.
An existing pipeline at a Sahuarita-area groundwater recharge project isn't nearly big enough to carry all the Colorado River water that two other parties say they want to put into two proposed connecting pipelines, Tucson officials said Tuesday.
As part of training in 2011, UA student Mark Iobst helped guide a drill bit by communicating with the operator (not pictured) of a single-boom jumbo drive drill.
A second straight year of dropping copper prices has done little to slake Southern Arizona's two biggest mining employers' thirst for new workers.
An auditor for Rosemont Copper's parent company has put up what outside experts call a red flag indicating significant financial issues that could jeopardize the company's future.
Rosemont Mine opponents claim in an appeal that Arizona's environmental agency approved an air quality permit for an outdated mine plan and overlooked the likelihood of air quality violations.
A stretch of the Arizona Trail, used by mountain bikers, above, could be shifted east if the Rosemont Mine enters operation.
Rosemont Copper has agreed to pay for relocating a segment of the Arizona Trail to avoid impacts of its planned mine southeast of Tucson - but that would happen only if the mine plans win federal approval.
A new Washington, D.C.-based mining advocacy group is criticizing the U.S. Forest Service for its recent decision not to rule on the Rosemont Mine this month as previously planned.
The federal government won't make a decision on the Rosemont Mine as expected next month and it's not clear when it will, the Coronado National Forest's chief said Friday in announcing the latest of many delays for the $1.23 billion project.
The question of whether it's possible to reduce the juice of a power line for the Rosemont Mine has come up in heated, dueling letters to the Forest Service from Pima County's administrator and Rosemont Copper's CEO.
The protracted debate over a proposed air quality permit for the Rosemont Mine could get longer.
Rosemont Copper is backing off from a recent statement that its proposed mine will use less water than originally thought due to changes in its operations.
A sign near an artificial pond marks the end of public access in the area proposed for Rosemont Copper's open-pit mine in the Coronado National Forrest in the Santa Rita Mountains southeast of Tucson.
More copper produced - yet less water sucked from the aquifer, less pollution, less juice needed to power the mine and mill, and fewer trucks on the road.
This composite of six images, facing east, shows the valley in the part of the area proposed for Rosemont Copper's open-pit mine in the Coronado National Forest in the Santa Rita Mountains south of Tucson. Rosemont's parent company says it has found more copper sulfide reserves and has incre…
From left, flotation concentrate (shining chalcopyrite), copper concentrate in a very fine, wetted, sand form; a solution of all the minerals in the copper ore rock, plus chemicals and water used to separate the calcopyrite; a compound containing copper, along with iron and sulfur, the basic…
A worker moves copper cathodes, a process Rosemont has decided against, at a mine near Benson.