Page 8 - Contractors World - International Vol 3 No 7

Segregation Prevention and Compaction
A number of precautions were taken to prevent segregation. Loads were covered at the plant to maintain temperature. In
addition, special focus on the trucking pattern ensured mix arrived at proper temperatures. Four independent sensors on
spreader augers and conveyors provided the proper amount of material to the paver’s screed—electrically heated to help
keep the temperature of the mix consistent.
Specified compaction values were achieved with vibrating tampers on the paver’s smoothing bar, followed by
compaction with a Cat CB534D vibration roller weighing 12 metric tons (13 U.S. tons).
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Volvo in vast iron ore pits
Extraction giant LKAB has launched its own growth project; called LKAB 37 with a
goal to expand its production capacity to 40 million tons by 2015. The company is an
ambitious sharp player in the market, with the objective to grow in the global iron
industry and is set on delivering more of the precious mineral to meet the demand of
its customers – which means it will need more machines and equipment to support
its expanding capacity.
Volvo machines play an important role in the newly-opened Gruvberget open pit
mine in Svappavaara – a mining village situated close to Kiruna, Sweden.
We use Volvo articulated haulers and motor graders to move excess debris, dig
around the mine and clear haul roads,” says Peder Nensen, general manager of the
growth project at LKAB. “We also use Volvo wheel loaders and excavators on the
access roads to transport the iron ore and support our production.”
In Sweden, there are about 50 mining projects in total including LKAB’s developments,” adds Nensen. “Work
has begun on four of our projects, and the rest are in the planning stage. We are very close to opening another pit in
Cliffton, LKAB’s contractor in Sweden, is contracted until 2016 to operate the mine and has a fleet of 12 Volvo wheel
loaders and eight excavators, which began operating during 2010.
We run the operation around the clock throughout the year and handle the loading of ore and speciality products for
LKAB,” says Ronny Nylund, site manager at Cliffton. The Gruvberget mine is 450 meters long by almost 350 meters wide
and plunges to a depth of 130 meters below the surface.
To date, more than one billion tons of iron ore has been mined. In 2013, a new main haulage level at 1,365 meters
will be operational securing the mining operation for an additional 20–30 years.
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Contractors World - InternationaVol 3 No 7