Blasting explosives like gunpowder, nitroglycerin, and dynamite all work well for carving a tunnel through a mountain. The dense rock walls can support themselves, and they won't collapse into the ...

This simple invention, which is a length of string containing gunpowder coated in tar ... of deaths and injuries associated with hard rock mining. Bickford's product was very successful and ...

Blasting Technology Inc. drill operators Brandan Omerod (left) and Pete Hoholik fill drilled holes with ammonium nitrate while preparing to blast a section of blue rock on the Kihei high school ...