Agency draws flak from environmentalists for its handling of Trench Mine runoff.
Tucson has been issuing domestic partnership certificates since 2003.
Toxic heavy metals may have leached into the water during heavy rains.
Federal regulations will cut sulfur dioxide emissions 85 percent at the smelters.
Satisfying readers' curiosity about what's under construction around Tucson.
The Silver Bell mine is west of Marana.
Grupo Mexico, parent of Tucson-based copper producer Asarco LLC, is expected to complete a deal to take full control the Silver Bell mine west of Marana by acquiring an additional 25 percent ownership stake from a business partner.
Phoenix car wash mogul pleads guilty; Asarco to pay Arizona fine; more.
A man who prosecutors said was the ringleader of a multimillion-dollar copper-theft scheme was sentenced Wednesday to prison.
When Margarita and Rene Acosta arrived in San Manuel, the mining town north of Tucson in 1977, they did so with the hope of finding steady employment and, more importantly, getting an education for their three children.
Depressed copper prices in the 1920s and ’30s saw the eventual closure of mining operations in the Silver Bell district. The nearby Sasco smelter had shut down by 1921 and the Sasco townsite was abandoned.
It seems like mining has always been big in Arizona. In 1736 the discovery of silver just below the current border with Mexico drew prospective Spanish miners northward into Southern Arizona. After Arizona became a U.S. territory, gold was found near Yuma in 1858 and in 1863 in the Bradshaw …
The earliest recorded mine in the Silver Bell Mountains was the Old Boot Mine in 1865. The mine, later renamed the Mammoth Mine, was developed by prospectors and financed by a group of Tucson merchants including Zeckendorf and Steinfeld, who were drawn to the heavy, black garnet-stained rock…
Tucson-based Asarco held a formal dedication ceremony this week — led by President and COO Manuel Ramos — of the expansion of the south mill at the Mission Mine south of town.
The mining giant Asarco will pay Pima County its second round of civil penalties and environmental reparations in three years over tailings dust blowing from its Mission Mine in Sahuarita into neighboring homes.
Tucson Modernism Week returns Friday with an entirely new schedule from last year but the same goals in mind.
Officials with Asarco LLC say the copper mining company and unions representing employees at sites in Arizona and Texas have agreed to continue negotiating a labor contract.
Federal authorities have fined Tucson-based copper-mining giant Asarco more than $800,000 for failing to permit an audit of the company’s production from its Mission mine near Sahuarita.
State Assistant Attorney General Mike Jette discusses the copper thefts. Mine workers are accused of selling the copper to recyclers at a fraction of the price. The recyclers would then resell it to Chinese importers, investigators say.
Eighteen people are facing charges in a multimillion-dollar copper theft ring involving Asarco employees, state law-enforcement officials said Tuesday.