slot drilling in the an iron ore mine in Malmberget, Sweden, using Wassara slot drilling technology for Blind Drop Raises.
“For inverted blind slot raise drilling and ventilation shaft drilling the Swedish mining company LKAB uses slot drilling technology in its iron ore mine at Malmberget. The first step is to drill the pilot hole. Then the pilot tube is inserted into the pilot hole. The second hole is then drilled parallel to the pilot hole thanks to the pilot tube. The procedure is then repeated, that is when the third hole is to be drilled the pilot tube is inserted in the second hole and so on. When the required number of slot holes have been drilled the blast holes are drilled. The advantage is that the blast holes can be optimized regarding direction and numbers with respect to the slot. Blasting is then performed towards the slot.”
Courtesy of Wassar AB, Stockholm – for all your drilling needs
1 comment:
So it must be a kind of speeded-up evolution amongst Tunnelling Men - the ones who have no idea what's going to happen when it goes off bang end up in lots of little pieces rather quickly: and hence the ones who keep doing it must be very good at it.
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