PAN across Gatineau River to HALS of brucite refinery near Wakefield, Quebec. CS of two men setting off blast, operating plunger. LS of explosion going off on rock wall in quarry. HAMLS of dump truck and steam shovel moving in quarry. Shot of rock wall in quarry in Gatineau. Sequence in laboratory showing two technicians testing brick in Amsler compressive testing apparatus. Shot of technician placing sand specimen in red hot piston. CU of hand setting speedomax potentiometer. CUs of heliarc weld nozzle joining two extruded magnesium sections.