The proposed Rosemont Copper project has officially entered its 45-day objections period.

The 45 days kicked off with the publication of the Final Environmental Impact Statement and a draft of the Record of Decision.

“The objections are based primarily on whether the (U.S.) Forest Service responded to the comments it previously received on the Draft Environmental Impact Statement,” said Steve Polaski, a water expert at Sierra Club.

Since any objection must relate to a previous comment, only those who took part in public comment periods can object.

The Sierra Club, local environmental group Save the Scenic Santa Ritas and others are collaborating in a formal objection to the project.

“We’re in the process of reviewing the Final EIS, and looking to see whether our comments were addressed,” Polaski said. “And if not, we can file objections to the Forest Service.”

The proposed Rosemont Copper mine site sits on 5,000 acres about 30 miles south of Tucson in the Santa Rita Mountains.