VAIL, Colo. (AP) — Colorado’s Vail Mountain ski area will open 70 acres (28.3 hectares) of terrain to skiers and riders on Friday. Thanks to a newly expanded snowmaking system, the resort will start the new season atop Gondola One with the Swingsville and Rams-horn runs, a beginner skiing area over at Golden Peak, as well as runs surrounding Chair 4. Vail Mountain Vice President and Chief…