CU of label on bags. Shots of worker watching vat filled with liquid in refinery including CU of liquid passing on rack, dripping into pail. Shots of large wheel turning in vat, dragging along belt of conveyor, passing liquid contained in vat. Shots of man grinding piece of metal on emery wheel, including short PAN from worker's face to metal passing on wheel. Sequence on man welding showing man putting on protecting mask, starting to weld, sparks from welding. Shots of workers standing by conveyor, selecting ore rocks from conveyor, HACS of rocks moving on conveyor. MS of large vat revolving rapidly on itself. Rear CS of worker watching vat turning.