A R10-million (US$1.4 million) export order to Dubai has been secured by bulk materials handling and minerals processing specialist Osborn Engineered Products SA (Pty) Limited.

Based in Elandsfontein, Johannesburg, Osborn Engineered Products is a leading manufacturer of bulk materials handling equipment, and a specialist turnkey materials handling contractor for mobile and fixed crushing and screening plants and conveyor systems.

“This significant order includes custom-built incline shaft-driven quarry screens that are the largest ever manufactured by our company,” says Osborn marketing manager Martin Botha.

The screens are for two new quarry plants located some 120 km outside Dubai, where the booming building industry is creating a massive demand for aggregate. “The new plants need high capacity machines,” he explains, “and Osborn was able to meet their requirements with custom-built, oversize units that were competitively priced.”

The largest screen in the order is a 2.5 x 9m doubledeck, Super King. A 2.1 x 7.2 m, three-step vibrating grizzly feeder was also specially built as part of this undertaking for new customer, Ready Rocks of Dubai. A total of 14 Super King screens and two vibrating grizzly feeders have been shipped by Osborn, together with a number of machines from Astec Industries sister companies Telsmith and KPI. Ready Rocks also purchased two new Telsmith 5566 jaw crushers and two KPI horizontal shaft impactors.

Shipping the huge machines to Dubai has posed its own set of logistical challenges, with the shipping costs alone amounting to some R1.5 million. Once the units arrive at their final destination, Osborn technicians will spend time on site training the customer’s personnel in operation and commissioning of the new plants.

“This has been an exceptional order for Osborn,” Botha enthuses. “In addition to including the largest incline shaft-driven quarry screen we have manufactured, it is also the first time we have produced a twin-shaft incline screen. The twin shaft design was selected to reduce the load on the bearings and to provide maximum efficiency and minimum downtime,” he concludes.

Hansen gearboxes

Hansen gearboxes specially designed for
the Navoi gold mine in Uzbekistan

Meanwhile Hansen Transmissions South Africa — a company specialising in power transmission requirements for Southern Africa’s mining, water treatment and materials handling industries — has received an order for the supply of seventeen gearboxes to Navoi gold mine in Uzbekistan.

Valued at approximately R7 million (US$1 million), the order was placed by Lightnin South Africa, who had received the order directly from the mine.

The gear units have been designed to give a minimum of 100 000 hours bearing life, and Hansen were required to include both external cooling and heaters on the agitator drives due to the remote location of the project and the units’ exposure to harsh environmental conditions.

Lightnin SA, assisted by Hansen field service technicians, will be responsible for commissioning of the units, while the gold mine will take care of routine gearbox maintenance.

South African switchgear company Moeller Electric has completed and delivered control panels for eight motor control centres and 231 field isolator stations at the JSC Varvarinskoye Mine in Kazakhstan. They were ordered by Senet Projects, the South African firm appointed to oversee engineering, procurement and construction management at Varvarinskoye.

Projected cost of the mine – which will produce copper and a small proportion of low-grade gold ore – is around US$95-million (close to R700 million).

All design work for the control panels and field isolators was undertaken by Moeller Electric engineers based in Johannesburg.

The switchgear solution comprised boards built around Moeller’s sophisticated NZM-2, 3 and 4 high capacity, electronic circuit-breakers, which are characterised by their ability to manage fault currents reliably and effectively. Moeller DIL contactors and indication lamps were used throughout.

The panel switchgear begins with Moeller IZM air circuit-breakers on the incoming power supply, and moves down to Moeller moulded-case breakers for control on the low power circuits. Varvarinskoye is scheduled for commissioning in October this year.