At 0045 mountain time, a Dassault Falcon was substantially damaged during landing on runway 8L at Pueblo Memorial Airport. The pilot, copilot and three passengers reported no injuries. The copilot reported that the landing was fine until he activated the airplanes thrust reversers, at which time the airplane yawed to the left and the pilots lost control of the airplane. A witness said the airplane spun around two or three times on the runway, which was covered with three-quarters of an inch of wet snow. The airplane came to rest in a field 150 feet north of the runway and 5,000 feet from the approach end. The right engine thrust reverser was observed in the stowed position. The left engine thrust reverser was deployed.