Abstract: A surface blasting product which includes a container, a receptacle which contains adhesive which is displaceable to adhere the container to a rock, and an explosive charge, inside the container, which can be ignited to fragment or displace the rock.

Abstract: A cartridge for breaking rock which includes a tubular housing in which is formed a first compartment. The cartridge includes a first energetic composition inside the first compartment and a primer which is exposed to the first energetic composition. The cartridge includes a second compartment inside the tubular component and a plunger inside the tubular component which is movable under explosive force towards the primer. The cartridge still further includes a second energetic composition inside the second compartment and an actuator and a fuse for initiating the second energetic composition. The actuator has an area which is smaller than the cross-sectional area of the plunger and is movable, by movement of the plunger, towards the primer, and in that the primer is initiated by the actuator only when liquid fills a volume enclosed at least partly by surfaces of the actuator and of the primer.

Abstract: A warning system in which an audio pulse train is continuously emitted from an item of equipment and wherein a person, exposed to the audio pulse train, carries a detector which, in response to detection of the pulse train, emits audio pulses which are detected at the item of equipment.

Abstract: A rock anchor (10) which includes a cable (12) with a hollow core, an expansion mechanism (20) at one end of the cable, a tube (14), which acts on a load washer (16), in which part of the cable is located, and a wedge (18) which locks the cable to the tube.

Abstract: An electronic blasting capsule which includes a housing which contains a propellant, a fuse, a sensor for detecting the position of the housing in a capsule delivery path, an energy arrangement for obtaining energy from an external energy source, and a controller, responsive to the sensor and the energy arrangement, for firing the fuse to initiate the propellant.

Abstract: An electronic blasting capsule which includes a housing which contains a propellant, a fuse, a sensor for detecting the position of the housing in a capsule delivery path, an energy arrangement for obtaining energy from an external energy source, and a controller, responsive to the sensor and the energy arrangement, for firing the fuse to initiate the propellant.