Southern hemisphere's largest concentrator under construction
Friday, 12.14.2007, 03:32pm (GMT)
he company says that, once completed, the new concentrator will be the largest concentrator in the southern hemisphere.
R400-million civil works Northern expansion project contracts were
awarded by negotiation rather than tender, and Grinaker-LTA Civil
Engineering was chosen for its previous experience, capabilities and
“Vhumbanani, which is responsible for the
design and management of the project, handled the negotiations and we
feel that their approach to appointing contractors made a lot of
sense,” says Grinaker-LTA Civil Engineering contracts manager Peter Meidlinger.
being awarded the initial contract and starting work on site in August
2006, Grinaker-LTA Civil Engineering has been asked to construct two
additional structures – the concrete frame for a substation, and a
13-m-diameter/30-m-high storage silo.
The new concentrator plant
will be used to crush mined ore and process it to form a concentrate,
which is then further processed in the conventional platinum- refining
The civil works for the new plant, which is to be
completed in August this year, will be linked to the existing plant by
In addition to these structures, the main
structures being built by Grinaker-LTA are the high- pressure grinding
roller feed silo, the mill feed silo, the high-pressure grinding roller
crushing building, the vibrating grizzly building, the secondary
screening building, the secondary crushing building, the high-pressure
grinding roller screening building, and 13 linking conveyors.
two large silos, 18 m in diameter and 55 m high, form half of the
project. The first silo base (high-pressure grinding roller) was
completed in early November last year, and required 1 300 m� of
continuously poured concrete.
To facilitate the concrete pour
and obviate the need for trans-porting concrete, a tower crane and a
concrete batch plant was positioned next to the silo. This resulted in
considerable cost and time savings.
Engineering has been assisted in the construction by its sister
companies, Karrena Africa, which was responsible for the slipforming of
the three silos, and Steeledale Reinforcing, which is supplying the
reinforcing steel. All the concrete required for the various buildings
and con- veyors is supplied by the com- pany’s own batch plant on site.
Other plants provided by Grinaker LTA Civil Engineering’s plant
division include three mobile cranes, two tower cranes, and three 6-m�
The Grinaker-LTA Civil Engineering site is
managed by project manager Trevor Morris, assisted by a capable staff
team and 350 hourly paid labourers, 65% of whom are from the local
Source : Mining Weekly