UNDERGROUND DRILLING
Key benefits of the Sandvik DU412i
n Versatility with all ITH applications
standardised into one feed – feed and
carousel designed with component
commonality, optimised for automation
n High capacity onboard booster offering
(up to 34 m³/min @ 28 bar) – electronic
compressor inlet control allows better
modulation of air volume and effective use of
different hammer sizes
n Improved boom reach, fast handling and
stability in drilling – new ZR35 telescopic
boom with wide swing and tilt angles, fast
and accurate in use
n Improved drilling performance in ITH
longhole drilling – iSOLO drilling control
system with fast and accurate feed control
the ZR35 telescopic boom “is the best
foundation for accurate longhole drilling. It is a
new boom, in which current and proven top
hammer drilling concepts have been utilized. The
ZR35 boom has wide swing and tilt angles and
can be utilized in most mass mining methods in
production drilling and service support; the
increased offset allows drilling of parallel vertical
holes up to 3,000 mm. The boom is fully
instrumented and equipped with electronic
parallelism, assisting the operator in moving the
drilling module between holes.”
The Sandvik DU412i is offered with a range of
high capacity onboard boosters from 19 to 34
m³/min, allowing the increase of operating
pressure of 3” to 6” hammers’ from 24 to 28 bar.
Therefore, up to 20% higher penetration rates
and 10% higher drilling capacity can be achieved.
The onboard booster range also supports 8”
hammers operated at 24 bar in single hole
drilling, or the V-30 reaming head operated at 24
bar in slot raising, from 6 bar air inlet. The
electronic compressor inlet control allows better
modulation of the air volume, making it possible
to use small hammers with bigger boosters and
maintaining the designated hammer pressure
until the end of the service life.
LKAB Wassara continues work on coil
tubing rig
LKAB Wassara AB is a subsidiary of LKAB with
operations in Huddinge and Malmberget. The
company is well known to IM as developing
water-powered drilling systems. When blast
holes are straight the length are limited by the
distance between them in the outer end of the
fan. When the distance becomes to large the ore
fragmentation after a blast becomes suboptimal.
If the blast holes instead are made parallel the
length can be increased without increasing the
distance between them. In this way every hole
fan can result in more ore.
To be able to create parallel blast holes, LKAB,
in cooperation with LKAB Wassara, is creating a
new type of rig which can control the drilling in
real time. The drill system is not made up of
straight rods like on a traditional rig but of a
steel pipe on a coil that is winded up as the drill
penetrates the rock.
A rock drill rig under operation creates large
amounts of data from different sensors and
control systems. Digitalisation specialist HTM
System Solutions is helping LKAB Wassara to
build a system which collects and analyses
information valuable for both rig development
and ore production purposes. In the short term
the collected data will mainly be used for the rig
development but in the longer run the intention
is to utilise the data in the iron ore production
process.
HTM says it has designed and implemented a
system which has the capacity to reliably collect
data from several rigs in full operation.
“Wassara's engineers can now in real time
supervise what is happenings on the rig and see
how it behaves during drilling. Analysis can also
be performed on historical data.”
“Thanks for your interest in the project. We
will come with a media update when we have
made some more progress with the coil tubing
rig for parallel hole drilling.
Tim Peco, Development Engineer at LKAB
Wassara, told IM that final development work
still continues on the coil tubing rig for parallel
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