The company, business leaders and Republican members of Congress believe they have addressed environmental and tribal concerns while protecting the environment and holy Native American locations. [...] mining that mineral wealth creates the risk of pollution and a vicious boom-and-bust cycle that the Sierra Club says has resulted in more than 100,000 abandoned mine shafts around the state. Opponents also point to the foreign owners of Resolution Copper Mining, a subsidiary of British-Australian Rio Tinto and Australian BHP Billiton, saying it's unclear how much of the profits and the copper will stay in the U.S.