Our Expertise & Skills in mining
Designing the mining layout and blasts
Before any hole is drilled or rock mined, much planning goes into making sure the mining sequence runs smoothly and safely as possible. The mine planning engineers, in conjunction with geologists, drill and blast engineers and voids officers, design the size and shape of the blasts. This takes into account:
- location of the ore on the bench
- presence and intensity of old workings
Blasting breaks the rock into loose material that mining equipment can dig and carry. Before blasting, it is necessary to drill holes in the rock to insert explosives. These holes are drilled by a fleet of production drill rigs and drilled in a “pattern” in an area of the bench identified for blasting.
Charging (filling the holes with explosive)
Once the pattern has been drilled, its holes are checked for depth and the presence of water. This “quality control” ensures that blasts are as effective as possible and reduces poor blasting practices that may result in toe or oversize in the blast. The holes are then charged – loaded with explosives. A detonator (det) and primer are lowered down the hole to hang about 1m from the bottom.
Once all holes have been charged and the blast tied in, it is ready for blasting. Blasting depending on production requirements. Blasting is done on a hole-by-hole basis – no two holes are blasted at exactly the same time. This also helps reduce noise and vibration. The blast is initiated by remote control from one of several control rooms spread around the surface of the open pit.
Marking up ore
Before the shot can be dug, any ore blocks need to be identified. Geologists do this by pegging out the blocks with wooden pegs and coloured flagging tape, providing a visual aid to shovel operators and other production personnel to identify the location of the ore blocks
Digging the blast
After blasting, Excavators and Shovel does their work of collecting the blasted ores and pile them together.
Loading the ores onto Trucks
Excavators load the ores onto trucks. Each truck can be loading under 1 minute
Transport ores to dumping Zone
Loaded ores are then transported to its dumping zone. After dumping the truck returns for next trip
Clean up and bench preparation
Once the shovels and trucks have cleaned off the blast, it is time to send in the clean-up equipment. These machines clean up the walls, pull out any material from the old workings that the shovels couldn’t reach and generally tidy up the bench for general use. Once this is done, surveyors mark up the old workings and the process starts all over again.