A film about the changing machinery and industry in the United States. Charlotte, North Carolina - young men operating heavy digging machinery. Various shots of tractor shoveling dirt. Digging trenches, furrows in a field. Albuquerque: large blast explosion in a quarry. Ore is scooped into a truck. Truck drives down desolate road. Dump truck tips ore into a quarry. Variety of earth moving machines: huge conveyor belts (extends visibly for miles into the distance). Open pit mini