Miller Construction Company owner Gosta Miller, a commercial pilot and aviation engineer, and an employee, and a trucking company owner and a gas station attendant (Lovell, Lessey, Greene) saw an object like two inverted plates attached face-to-face, matte blue-grey or greenish-grey non-reflective bottom, bright aluminum top reflecting sunlight, 20 feet diameter (others estimated 15-25 feet), four to five feet thickness. Object seen over the north end of town at 3,000-5,000 feet height about four miles away moving in several directions rocking or rotating in semi-circles six times, move east descending rapidly to about 700-1,000 feet height, rock again a few times with upper side now visible reflecting sunlight, fly southwest to two miles west of Dillon, rock again a few times, then rapidly flew over airport 12 miles northeast of Dillon at 1,000 feet departing rapidly to the east disappearing over mountains. No sound or trail. Speed > 1,000 mph so great object seemed blurred.

One blue-green disc, about 20 feet across, was observed by four witnesses at a mountain for several minutes (Gosta Miller).

Google map of this location.