His interest in domestic copper could eventually be a boost to two delayed Arizona mining projects: Copper World near Tucson and the Resolution Copper project at Oak Flat near Superior.

Southern Arizona’s proposed Copper World copper-molybdenum mine, formerly known as the Rosemont mine, which has been delayed by a court ruling that limited how mining companies can discard tailings on ...

Environmental and community groups have appealed the Arizona Department of Environmental Quality’s decision to grant an air pollution permit to the Copper World ... pollution from mining waste dumps, ...