The jar-bar grizzly feeder is a heavy-duty feeder which may form the bottom of the feed hopper of a primary crusher. It consists of a series of bars of elliptical cross-section with the major axes of adjacent bars at right-angles. Material is moved forward by the rotating bars, with a tumbling, rocking motion which makes this type of feeder suitable for applications where fines and clay have to be removed from the feed.
The swing jaw of a jaw crusher.
The use of high-velocity jet flames to cut blastholes in hard rock.
A machine in which the feed is stratified in water by means of a pulsating motion and from which the stratified products are removed separately, the pulsating motion being usually obtained by alternate upward and downward currents of water.
A mineral-processing operation in which particles are separated on a density basis by water pulsation.
A rail bender operated by hand.
The techniques of helping to determine a fair day’s pay for a particular job. It is the assessment of the value of the job not the individual and must reflect fairly the skill, experience, responsibility and condition of the job.
Insulating thimbles placed over the connected ends of detonator leads coupled in large rounds of shots, and over the connections between the detonator leads and the shotfiring cable.
A beam which supports a floor or ceiling.
The work performed when the point of application of a force of one newton is displaced through a distance of one metre in the direction of the force.
Symbol: J (=1Nm)
The part of a shaft which is supported and held by a bearing.
A drill carriage usually holding several drifters for tunnelling work.