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Rock blasting in Finland. Drilling and blasting is the controlled use of explosives and other methods, such as gas pressure blasting pyrotechnics, to break rock for excavation. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. The result of rock blasting is often known as a rock cut.
An electrical blasting cap for triggering the mine was inserted through a small hole in the side. Internally the mine consisted of a layer of 12-ounce (340 g) of C-3 explosive (the forerunner of C-4 explosive) in front of which was laid an array of 0.25-inch (6.4 mm) steel cubes
Two blasting machines. At rear is one where the trigger works by depressing or raising the handle; at fore, one where the handle is twisted. A blasting machine or shot exploder (commonly called a plunger) is a portable source of electric current to reliably fire a blasting cap to trigger a main explosive charge. It is mostly used in mining and ...
The M15 mine is a large circular United States anti-tank blast mine, first deployed during the Korean War. Essentially, it is a larger version of the M6A2 anti-tank mine , which it replaced. Although the M15 has been superseded by the M19 mine (a plastic-cased minimum metal mine of more modern design), the U.S. retains large stocks of M15s ...
An Australian minister likened a mining company blasting ancient rock shelters to the Taliban’s destruction of giant Buddha carvings and vowed Thursday to improve protections of Indigenous ...
Power rock drill, mounted on a column, in operation in a mine. A drifter drill, sometimes called a rock drill, is a tool used in mining and civil engineering to drill into rock. Rock drills are used for making holes for placing dynamite or other explosives in rock blasting, and holes for plug and feather quarrying. [1]
A non-electric detonator is a shock tube detonator designed to initiate explosions, generally for the purpose of demolition of buildings and for use in the blasting of rock in mines and quarries. Instead of electric wires, a hollow plastic tube delivers the firing impulse to the detonator, making it immune to most of the hazards associated with ...
The casing of blast mines may be made of metal, wood, or plastic. [8] Some mines, referred to as minimum metal mines, are constructed with as little metal as possible – as little as 1 gram (0.035 oz) – to make them difficult to detect. [9] Common explosives used in land mines include TNT (C 7 H 5 N 3 O 6), RDX (C 3 H 6 N 6 O