The Sonoma County Board of Supervisors has approved an agreement paving the way for a tribal casino-resort project on the site of the current River Rock Casino near Geyserville.

Following a heated meeting Tuesday marked by testimony from numerous lawyers and frustrated neighbors, the board voted 4-1 to approve the agreement. James Gore, the supervisor who represents north county, cast the lone dissenting vote.

The agreement outlines a project on Dry Creek Rancheria’s Alexander Valley land that would feature a hotel with nearly 300 rooms, a 60,000-square-foot casino with up to 1,500 slot machines — about 300 more than in the existing gaming hall — a wedding chapel and spa, among other amenities.