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Steve Christy, at a supervisors meeting in December 2017, opposed a resolution condemning the Rosemont copper mine east of Green Valley.

The long-anticipated Rosemont copper mine was approved in March after a 12-year process involving 17 agencies, but court filings — five in the past couple of years — promise to slow things down. Pima County is piling on, too.

The U.S. Army Corps of Engineers on Friday signed the final permit needed to clear the way for construction on the proposed Rosemont Copper Mine east of Green Valley and Sahuarita.

The lower test plot at the Rosemont mine location in August 2010, less than a year into the study on the best practices to reclaim the mine wi…