While ""spotting"" belt structure for a belt move in 12-A section, a top cradle in the scoop bucket contacted the mine floor while the scoop was tramming forward. The structure was thrown out of the bucket. Employee was located 8' in front of & 3' off to the side of the bucket but was struck in the lower right leg by the top cradle. Received 35 staples & 9 inner sutures to close.