Sonoma County supervisors have authorized an appeal of a court ruling striking down approval of the Roblar Road quarry on environmental grounds.
The board voted 4-1 Tuesday in closed session to back the appeal, with Shirlee Zane, the board's chairwoman, dissenting.
The 70-acre quarry west of Cotati is the target of a lawsuit by neighbors and environmentalists concerned about its impact on water and air quality, traffic and wildlife habitat.
Sonoma County Judge Elliot Daum sided with opponents on several claims. The ruling would force the county and quarry owner John Barella to revise substantial parts of the study and perhaps return to the board for another vote.
But county officials say Daum's ruling was flawed and the environmental study is sound. Barella also is expected to appeal.