16 charges of high explosives are used to blow out rocks at Llandullas Limestone Quarries in North Wales.
Item title reads - A big bang. 16 charges of high explosive, totalling 3 1/2 tons, used to blow out 40,000 tons of rock at Llandullas Limestone Quarries. North Wales.
M/S of men sheltering. M/S of the limestone rocks, M/S of explosion as wall collapses throwing up dust. M/S after it has cleared, camera pans up limestone.