Tag Archives: Concor Infrastructure

Concor Infrastructure closes in on Khoemacu copper-silver project milestones

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Concor Infrastructure says it is nearing completion of a 35 km access road for the Khoemacau Copper Silver Starter project in the Kalahari region of Botswana.

The company is at the same time also busy with constructing a parallel haul road, as well as conducting earthworks and concrete civils at the Khoemacau Boseto processing plant.

The Khoemacau copper project, in the central Kalahari copper belt, is developing underground operations at its flagship Zone 5 deposit. The mine plan involves three adjacent underground mines at Zone 5, each producing over 1.2 Mt/y in their first five years of production.

The haul road in question will allow mineralised material to be trucked 35 km from Zone 5 to the Boseto processing facility, while the access road will be used by light vehicles. After processing at Boseto, the mineral concentrate will be shipped out for smelting.

Good progress has been made on construction of the access road according to Jay Juganan, Contracts Director at Concor Infrastructure. The contract for both the access and haul roads was awarded in November 2018.

“The access road was little more than a sand track when we established on site and was accessible only by 4×4 vehicles,” Juganan says. “Essentially, we are creating a corridor for both roads in parallel, and for the powerlines to be installed by another contractor.”

The planning of the haul road also had to consider the large and ancient Baobab trees that are common in the area. Preservation of these trees is a vital imperative, requiring the haul road to be diverted on occasion to avoid about half a dozen Baobabs, which are hundreds of years old.

The access road is 90% complete and due for completion in the September quarter. The haul road is also expected to be completed next quarter, the company said.

Road construction comprises a 600 mm deep cut filled with pioneer crushed rock followed by a G3 sub base and base layer. In some areas, the crushed rock is replaced by a natural calcrete.

The wearing course is a 9/19 mm double seal, according to Concor, which had to crush all aggregate on site from the old mine waste rock stockpile at Boseto.

Concor Infrastructure Contracts Manager, Tiaan Krugel, said the remote location of the site and the dry conditions are among the key challenges encountered on this project.

“The sourcing and timing of the supply of equipment, parts and construction material required careful and detailed planning,” Krugel says. “The majority had to come from the capital Gaborone – 900 km away – with the other challenge being that most of our equipment OEMs are based in Johannesburg, which is more than 1,300 km from site.”

The scope of Concor’s work at the Boseto process plant, the contract of which was awarded in November 2019, includes earthworks and concrete civils to the existing and for the new process plant structures for the crushing, milling, flotation and concentrate handling circuits. The plant had previously treated material from an open-pit copper mining operation at Boseto, under the ownership of a different company.

Krugel highlighted the challenges of working with concrete on a remote site, especially where temperatures can reach over 40°C during working hours.

“A special concrete mix was designed to accommodate on-site conditions,” he said. “This includes the use of admixtures to prolong the concrete’s workability as well as having to chill the water we use before it is added to the cement and aggregates.”

In addition to the refurbishment and upgrading work at Boseto, Concor has also contributed to preparing the infrastructure at the Zone 5 mining site, where underground development is underway.

The work included all internal roads at the Zone 5 mine, terracing for the 650-person accommodation camp, the mine administration surface infrastructure area, the mine workshops and stores area and the explosives magazine together with construction of the ROM pads.

The Khoemacau Starter project expects to produce 62,000 t of copper and 1.9 Moz of silver each year over its planned life of more than 20 years, according to the company.

“Despite the restrictions related to the COVID-19 pandemic, which saw a reduction of staff numbers on site due to individual choices, we are working hard to ensure that program schedules will be met,” Juganan said.

Concor Infrastructure helps Exxaro beat Belfast coal mine production goal

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The start-up of Exxaro’s Belfast coal mine in Mpumalanga province, South Africa, has been aided by Concor Infrastructure’s work on building dams, roads, platforms and other infrastructure, the infrastructure group said.

At work since October 2017, Concor Infrastructure is constructing four major dams, 26 concrete platforms and terraces, 37 internal roads of 16 km in length, and is upgrading almost 13 km of provincial roads, among other aspects at the mine, it said.

This month, Exxaro announced that Belfast had produced its first coal six months ahead of schedule. The mine, which was only expected to start producing coal in 2020, was expected to cost R3.3 billion ($221 million) to build and would be a “first-of-its-kind digital mine”, ranking as the last good-quality A-grade, high-yield coal deposit in Mpumalanga, the coal miner said.

According to Concor Infrastructure Contracts Manager, Pierre van Vuuren, these tailings dams are being lined with both a geosynthetic clay liner and high-density polyethylene sheets, in accordance with the water use licence and related environmental regulations. Various structures around the dams are also being installed, including large silt traps, drying beds, inflow chutes to prevent scouring, and spillways and sumps.

Among the concrete platforms and terraces are two primary crusher bases being built for the run-of-mine crushing facilities. The various structures being built by Concor will demand almost 350 t of steel reinforcing and nearly 2,700 t of bulk cement. Other inputs will be around 15,000 t of 19 mm aggregate and nearly 13,000 t of crusher sand.

Extensive upgrading is being done on the D1770 and D1110 provincial roads – for the transport of coal to the rail siding – including eight major culverts under the roadway, Concor said. For all the project’s road works, almost 9.5 km of subsoil drains are to be installed, as well as 2.7 km of stormwater culverts. G5 and G6 construction material comes from an external quarry and crushing plant about 30 km from site towards Carolina.

Contracts Manager, Mabandla Dlamini, says the project has had a substantial local impact with a core labour complement of about 180 personnel being accommodated in the Emakhazeni municipal district. The overall workforce managed by Concor Infrastructure, with contractors, totals closer to 700 – all of which are transported 30 km daily by the local taxi network.

Dlamini also says various subcontracts are outsourced to local small enterprises, such as drainage, stone pitching, paving, kerbing, fencing, security services and catering. Diesel is sourced from a local fuel depot in Belfast with the project expected to consume about 4.3 million litres of diesel in site-wide applications.

Over 150 items of plant and equipment are active on the site, according to Site Agent, Sarel van der Berg, with about 40 items such as articulated dump trucks, tippers and graders sourced from local plant hirers.

Belfast is expected to produce 2.7 Mt of good-quality thermal coal a year for at least the next 17 years, starting in 2020. There is also potential for a second phase, which could take the mine life to 30 years.