The commercial certificated pilot was landing a tundra tire equipped airplane at a remote area next to a frozen river. The pilot had landed at the same location the previous day to assist his passenger in locating a lost snow machine. Overnight, about 4 to 6 inches of snow fell in the area. On the accident date, the pilot landed in his tracks from the previous day. During the landing roll, the new snow layer slowed the airplane dramatically, and the airplane nosed over. The airplane received damage to the vertical stabilizer, the rudder, and the left wing lift strut.