Importance of Canadian metals in World War II

Animated map with moving arrows into German swastika; ships move over west coast of Great Britain signifying blockade / VS German motorcycles and side cars rolling over bridge under construction; trucks, tanks crossing; high angle view of trucks on bridge / young German men hoisting heavy metal bombs / VS factory with shiny torpedoes / VS ships under construction / animated map with arrows pointing to Black Sea, Greece, Crete, USSR / huge hydroelectric dam / workers at iron smelter / tracking shot leading to pouring molten metal into crucible / VS collapsed bridges / VS workers with I-beams at bridge under construction / German officers atop bridge with sky behind them / VS pan view of smoke back to stack / miners at work; welders, rock tumbling, electric mine cart / workers in hot manufacturing area; heavy crucible / workers in vast aluminum warehouse / Canadians loading airplanes; snow planes flying overhead; pilot in cockpit; industrial and residential areas far below / wilderness area in Canada / Note: exact year not known