Tag Archives: Palabora Mining Company

Murray & Roberts Cementation and Palabora Mining celebrate last blast at new vent shaft

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Leading underground mining contractor Murray & Roberts Cementation and its client Palabora Mining Company (PMC) have celebrated the last blast at the new ventilation shaft, which took its depth to a final 1,200 m below surface on January 9, 2024.

The 8.5-m diameter upcast vent shaft – which holed through to an already-developed return air way at depth – is vital to PMC’s Lift II project. Lift II will develop access to ore resources sufficient to extend the life of this copper mine beyond 2040. Murray & Roberts Cementation Senior Project Manager, Fred Durand, says a key achievement was the project’s fatality-free record, earned over more than a million hours worked.

“The achievement of a million fatality free hours – reached in November 2023 – is more than just a number,” Durand says. “It reflects the deep-rooted safety culture that has permeated every aspect of the project.”

The innovative sinking methods, used for the first time in South Africa, were also carefully focused on achieving zero harm. Murray & Roberts Cementation employed its Canadian shaft sinking methodology, adapted to what became called ‘the PMC way’. This method included a solution to poor ground conditions, where the sidewall of the shaft was closed up within 48 hours by means of the shaft concrete lining after every three metres of advance.

“Among the improvements that this facilitated was the removal of the hazardous work by rock drill operators at the shaft bottom, who would traditionally have to install temporary support,” Durand explains. “We also decided not to conduct concurrent work in the shaft, so there was no risk of danger to anyone below when work was carried out from the stage.”

Durand emphasised the close collaboration between Murray & Roberts Cementation and PMC to ensure the success and safety of the shaft sinking. The project was significant insofar as there were many lessons learnt to be taken forward into future projects, he says, further improving the safety record of shaft sinking practice.

“We are already looking ahead to two more important shaft sinking projects within the South African mining sector, where there is potential for certain of these learnings to be applied,” Durand says.

A veteran of over 15 shaft sinking projects around Africa during his career, Durand admits finding aspects of the PMC way initially quite unusual when he joined the project in 2022.

“Ultimately, though, we all want to deliver safe projects, so there are many brilliant ideas that we have proven on this project,” he says. “These strategies have been combined with the company’s leading mining and engineering expertise, and made us very excited about the future of shaft sinking and contract mining.”

To facilitate streamlined programming on the project, the work ran on continuous operations with two 12-hour shifts. This, he notes, improves on the usual eight-hour shift system, which requires three shift changes – each change taking up valuable project time. The two-shift system requires only a morning and evening change.

The vent shaft will replace the two existing vent shafts from the Lift I project, which are likely to be affected as they are in the Lift I zone of influence. In the final stages of the project, Murray & Roberts Cementation will strip out its services from the shaft, lift out the stage and dismantle the headgear. Final demobilisation of the company’s infrastructure will be carried out during the March quarter of 2024, according to Durand.

Murray & Roberts Cementation continues to boost mining reputation in southern Africa

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Murray & Roberts Cementation continues to add to its order book of business in southern Africa, with the company saying it is engaged in a number of projects in South Africa and having project prospects in nearby countries.

According to Graham Chamberlain, New Business Director at Murray & Roberts Cementation, the busy pipeline of projects demonstrates the mining sector’s faith in the company’s industry knowledge and depth of skills. In southern Africa, the main projects underway are at De Beers’ Venetia Mine, Ivanhoe Mines’ Platreef project and Palabora Mining Company.

At the Venetia Underground project near Musina, work has been ongoing since 2013 in one of the largest investments in South Africa’s diamond industry in decades. Transitioning from open-pit to underground mining will extend the mine’s life until 2046. Murray & Roberts Cementation has been engaged in sinking, lining and equipping of two shafts – the production and service shafts – to a depth of 1,080 m. The company also developed a decline tunnel and is completing associated surface and underground infrastructure, in a project whose scope included raiseboring work to establish ventilation infrastructure.

“In this maturing project, the mine is now getting into ore and starting to develop the infrastructure levels,” Chamberlain says. “At the shaft bottom, good progress continues to be made with the construction of workshops, pumping stations, silos and loading arrangements.”

Murray & Roberts Cementation is also conducting all the infrastructure development at Ivanhoe Mines’ Platreef project near Mokopane. This includes the sinking of a 5.1 m ventilation shaft to meet horizontal development at 950 m below surface. To achieve the high accuracy levels demanded by the project, the raiseboring equipment was guided by directional drilling technology.

“A unique aspect of this project is that the shaft will be hoisting ore at that same time as allowing upcast air to reach surface,” Chamberlain says.

Another vent shaft by Murray & Roberts Cementation – measuring 8.5 m in diameter and reaching a depth of 1,200 m – is nearing completion at Palabora Mining Company near Phalaborwa. Part of the mine’s Lift II expansion, the project has earned an impressive safety record – being fatality free and achieving 574 days without a Lost Time Injury since 2022. Ground conditions were among the reasons why a blind sink was chosen as the optimal method instead of raiseboring, as the side walls needed immediate support to prevent scaling.

“We also have a number of services projects underway related to raiseboring, grout plants and rehabilitation,” Chamberlain explains. “Much of our work in this field is focused on old infrastructure that requires maintenance, repairs or upgrades; we also conduct extensive vertical work in ore passes and silos.”

The company carries out vital rehabilitation in ore passes where ground conditions have deteriorated to prevent ore from moving smoothly – thereby risking production targets. Innovating safer techniques for this work, Murray & Roberts Cementation has developed the tube-and-fill method, first applied about seven years ago at an underground platinum mine in South Africa. These installations are also expected to outlast the lifespan of an ore pass rehabilitated with traditional shotcrete.

“On the engineering front, we continue conducting rebuilds of underground mining equipment at our Bentley Park facility near Carletonville,” Chamberlain says.

He highlights the work of the company’s design department, which remains extremely busy with feasibility studies associated with vertical work. With the renewed interest in commodity segments like copper, there is also previous work that customers are asking Murray & Roberts Cementation to review and update.

Training in underground mining and related skills at the company’s Training Academy on Carletonville continues to empower many thousands of learners each year, Chamberlain points out. This skills development is done on behalf of clients, as well as for the company’s own requirements.

“At any one time, we can host about 420 learners, and we are generally at full capacity,” he says. “We have just recently upgraded these facilities to further enhance training technologies that allows learning to take place safely but in a realistic environment.”

In compliance with many African countries’ localisation regulations, Murray & Roberts Cementation has registered companies in eight countries in the Southern African Development Community – most of which have seen the company active with raiseboring. Chamberlain notes that there are specific opportunities in Zambia that the company hopes to capitalise upon in the near future, and is encouraged by the mining sector’s progress in countries like Namibia and Botswana.

Murray & Roberts Cementation hits 1,000 m shaft sinking milestone at Palabora’s Lift II expansion project

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Leading underground mining contracting company, Murray & Roberts Cementation has achieved what it says is a remarkable milestone at the end of July 2023, successfully reaching the 1,000 metre mark on its contract to sink the 1,200 metre ventilation shaft at Palabora Mining Company’s Lift II expansion, in South Africa.

This significant feat stands as a testament to the company’s exceptional capabilities and dedication to safety, it says.

The Palabora Mining Company Lift II expansion project is a crucial endeavour for PMC, aimed at enhancing the efficiency and capacity of its operations. The 8.5-m-diameter ventilation shaft will serve the Lift II block cave and plays a pivotal role in the overall mining infrastructure.

Reaching a depth of 1,000 metres in the ventilation shaft is a major accomplishment, highlighting the expertise and commitment of Murray & Roberts Cementation in tackling complex mining projects, it says.

Fred Durand, Murray & Roberts Cementation’s Senior Project Manager, says one of the most remarkable aspects of this project is the unwavering focus on safety.

“Despite the immense challenges involved in underground mining and especially blind sinking, we have maintained an impeccable safety record throughout the Lift II expansion project,” he says. “The team’s relentless dedication to safety protocols and best practices resulted in an impressive milestone earlier this year of 574 consecutive days without a Lost Time Injury (LTI).”

He says that the achievement of this safety milestone showcases the company’s commitment to ensuring the wellbeing and safety of its workforce.

Durand concluded: “As the ventilation shaft project enters its final stages, the excitement and anticipation among all stakeholders, including PMC and Murray & Roberts Cementation, are palpable. The successful completion of this project will not only mark a significant engineering feat but will also have a profound impact on PMC’s mining capabilities.”

Murray & Roberts Cementation has aligned with the owner’s team to display technical excellence, professional management and passionate safety leadership from the day site establishment commenced in October 2019, according to Aidan Schoonbee, Senior Manager for PMC’s Lift II Construction, Concentrator and Vent Shaft.

Murray & Roberts Cementation shaft sinking alternative takes safety to a new level at PMC Lift 2

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The sinking of a 1,200 m ventilation shaft as part of the Palabora Mining Company (PMC) Lift 2 expansion in South Africa is proving to be a partnership success story, based on an unshakeable commitment to safety, according to Murray & Roberts Cementation.

PMC commissioned this new ventilation shaft – which measures 8.5 m in diameter – to service its Lift 2 block cave, awarding the project to Murray & Roberts Cementation in February 2019. Now in its final phases, the project has earned an impressive safety record; it has been fatality-free, and, last year, achieved 574 days without a Lost Time Injury (LTI), the contractor reports.

The Lift 2 project will extend mine life by more than 15 years. Originally an open-pit mine, the Palabora mine transitioned to underground block cave operations in the early 2000s when Lift 1 was commissioned. Back in February, Murray & Roberts Cementation outlined that it had recently celebrated the achievement of a major milestone – reaching the 800 m mark – at the project.

“Feasibility studies indicated that a blind sink was the optimal method, despite its higher cost and longer time frame,” Jas Malherbe, Murray & Roberts Cementation’s Project Manager, explained. “Ground conditions were among the reasons why raiseboring was not an option, as the side walls needed immediate support to prevent scaling.”

Traditionally, the shaft would be lined to within 12-18 m of the shaft bottom, with the sidewalls being temporarily supported with split sets and mesh. However, the difficult ground conditions led to high levels of scaling that made this practice unviable.

“With ground conditions being such a key challenge on the project, we responded in an innovative way by taking the shaft lining right down to the blasted face,” Malherbe says. “The shaft sinking methodology in this project is, therefore, based on the Canadian shaft sinking method pioneered by Murray & Roberts Cementation – but has been adapted to ‘the PMC way’. This has involved lining the shaft to within 1.5 m of the shaft bottom, after mucking out the waste.”

Murray & Roberts Cementation uses a specialised concrete mix for rapid setting and early strength which hardens to 3 MPa within four hours – and this would be in place for at least eight hours before blasting. This solution requires that the blast is conducted while the shutters are still in place – so the shutters are strengthened and a toe added that would better handle the blast. The exposed concrete above the shutter is able to withstand the blast, as it has already cured for 48 hours.

Malherbe explains that drilling is undertaken by two twin-boom electro-hydraulic jumbo drill rigs. These are slung down the shaft from surface and nested in the four-deck stage for drilling the shaft bottom, a procedure which is repeated for each 48 hour blast-to-blast cycle. Waste rock is lashed using an excavator with a 0.36 cu.m bucket, which is lowered from surface through the stage to shaft bottom.

After blasting, an excavator is used for loading rock from the shaft bottom, which is safer than the conventional cactus grab, according to Murray & Roberts Cementation. Ground conditions lend themselves to the generation of large rocks during blasting, which can be difficult to handle. These are broken up using an hydraulic breaker, which can be coupled to the excavator. An 11-t kibble transports the waste rock to surface.

The Lift 2 project will extend mine life by more than 15 years

“Lashing a shaft with an excavator is not a new idea, but it is usually a back-up method to the cactus grab,” Malherbe says. “In this project, we decided that the excavator would be the primary lashing method, to further enhance safety on site.”

Steps have also been taken towards automating the headgear, to avoid the safety hazards of manually hooking the kibble to tip out the waste rock. This includes the winding engine driver being able to use a camera to check for correct hooking.

“We also opted to use electric actuators in this project, rather than the traditional pneumatic and hydraulic cylinders on equipment such as the bank doors, swing chutes and tipping chutes,” Malherbe continues. “This has allowed us to mitigate the risks such as hearing loss from the noise of certain actuators, and contamination from oil leaks.”

According to Sechaba Letaba, PMC’s Package Manager on the project, PMC took a deliberate decision to prioritise safety in the sinking of this ventilation shaft.

“By taking the PMC way, we have accepted that the pace of sinking would have to be compromised,” Letaba says. “This has proved to be a positive approach, as we have an outstanding safety record on the project. This is in stark contrast to the history of shaft sinking, which would often claim lives and cause injuries. We are therefore very proud of what we have achieved to date.”

He highlights the pivotal roles played by Sam Ngidi, PMC Senior Manager Operation & Lift 2 Project, and Aidan Schoonbee, Senior Project Manager Construction – in driving the project and ensuring its success.

Fred Durand, Murray & Roberts Cementation’s Senior Project Manager, points out that unexpected challenges tend to have an impact on scheduling, so the strong relationship of trust with PMC was vital to solving any issues as they arose.

“Our approach has always been to work closely with customers on solutions, and to ensure they are regularly updated on progress,” Durand says. “As a team, for instance, we decided that the rock breaker was the right solution for the issue of oversized rocks, and it was accepted that this would have an impact on the cycle times.”

Similarly, encountering more challenging ground conditions than expected required a significant mindset change about how the team approached the project.

“With the supportive relationship between PMC and Murray & Roberts Cementation, we were able to agree on the necessary remedies and adjust the timeframe to suit our priority – which was safety,” he says.

Malherbe concludes that, for Murray & Roberts Cementation, the lessons learnt on this project have shown the industry a viable alternative method of shaft sinking that takes safety to a new level.

M&R Cementation ready to make shaft sinking transition at Palabora copper mine

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The sinking of the 1,200-m deep ventilation shaft at Palabora Copper, in South Africa, is proceeding apace, notwithstanding the COVID-19 shutdown and restrictions, contractor Murray & Roberts Cementation reports.

Work began on the 8.5 m diameter shaft early in 2019, with pre-sinking recently reaching a depth of 50 m and the changeover from pre-sink to main sink almost complete, according to Murray & Roberts Cementation Project Executive Mine Development, Graham Chamberlain.

Part of the development of Palabora Copper’s new LIFT II underground block cave mining area, the shaft will be developed to a final blind sink depth of 1,190 m, with a drop raise to its final depth. Completion is expected in the September quarter of 2022, Murray & Roberts Cementation says.

“We were required by the client and national lockdown regulations to pause our work schedule, but operations resumed as planned when restrictions were relaxed,” Chamberlain said. “The priority is to ensure that safe working conditions are maintained, and the COVID-19 infections are avoided.”

The project is using automated machinery at the shaft bottom, removing employees from high-risk contact areas. Modern, high-penetration rate hydraulic drills are deployed on robotic arms nested on the shaft sinking stage. This allows operators to conduct drilling at any position in the shaft without physically being in contact with the drills, the company says.

“We shorten our cycle times with the use of explosive delivery pods containing sensitised emulsion,” Chamberlain said. “Electronic systems deliver real-time data on blast holes numbers, volumes and pressures, improving blasting efficiency and quality.”

To reduce potential disruption from the intersection of poor ground conditions, Murray & Roberts Cementation takes the shaft lining to the bottom of the shaft during sinking. In the past, industry practice tended to carry this lining to about 20 m from the bottom.

“Our lining approach is applied with the use of a modified version of the traditional shuttering, and our specialised concrete mixes which we design for this specific purpose,” Chamberlain explained. “The mixes are prepared and delivered by our on-site batch plant.”

Chamberlain adds that the company’s focus on Zero Harm and a rigorous safety regime continues to deliver a high level of safety on the project.

MacLean breaks new ground in Africa mining sector

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MacLean Engineering’s secondary breakers have been proving their worth in Africa, with a number of machines safely and effectively eliminating ore flow blockages and releasing trapped reserves above the draw point.

Built for the tough underground mining environment, these machines provide the solution to attacking high boulder hang-ups without endangering mine workers, according to MacLean.

One only needs to look at the Palabora copper mine, in South Africa, for proof of this, where three MacLean hang-up rigs have been working underground for over 15 years.

Palabora endorses MacLean’s commitment to promoting safety and productivity in the underground environment, through purpose-built, rugged and reliable mine vehicles, MacLean says. The SB8 and SB12 Secondary Breakers (993MR, previously) are part of MacLean’s Ore Flow suite, a leading ore recovery fleet in global underground hard-rock mining, and these rigs have brought down thousands of hang-ups at the operation, ensuring smooth running of both the mine and its mill, and a safe and sustained block cave operation, according to the company.

For lower hang-ups in a drawpoint, or oversize rocks on the ground too large for scoops to handle and too disruptive to get rid of with concussion blasting, the secondary reduction rig, the Blockholer, solves the problem and ensures production isn’t held up, MacLean says.

The past 24 months have been exciting for MacLean’s branch in Africa.

Petra Diamonds ordered a BH3 for its Koffiefontein diamond mine, in Free State Province, South Africa, with the company’s success showcasing increased safety used as a “proof point” to secure another order for a BH2 (pictured), according to MacLean, this time from the Kimberley Ekapa Mining joint venture, in the Northern Cape. Palabora has since placed an order for two secondary breakers for delivery in 2020.

“Both Koffiefontein and Kimberley mines echo the same message of improved safety, increased production, and long-term savings in infrastructure upkeep due to the inclusion of MacLean secondary breaking units in their mining cycle,” MacLean said.

The two-stage process of their conventional approach to reduce oversize and bring down hang-ups (drill with one machine and manually load explosives by hand) has now been combined into a single-stage process with the Blockholers. This process eliminates the need for manually loading explosives, thus improving operator safety, and reduces damage to the draw point infrastructure.

“In addition, these units are used by both mines as utility drills to drill off cubbies as well as eye bolt holes due to their mobility and self-sustaining drilling capabilities of diesel power,” MacLean explained. “This versatility makes the MacLean Blockholers an invaluable tool to the mines.”

Murray & Roberts Cementation to sink ventilation shaft at Palabora copper mine

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Murray & Roberts Cementation says it has been awarded a contract by Palabora Mining Co for a 1,200 m deep ventilation shaft at its copper complex in Phalaborwa, Limpopo Province, South Africa.

The shaft, with a lined diameter of 8.5 m, will reach a final blind sink depth of 1,190 m before a drop raise takes it to its final depth, according to Braam Blom, Project Executive at Murray & Roberts Cementation.

“The duration of this project is expected to be just over three years,” Blom said. “After mobilisation, site establishment and surface civils have been completed, we expect to conduct pre-sinking until the end of 2019, with the use of our special shaft sinking gantry to a shaft depth of 65 m.”

A surface headgear and winder installation will then be constructed from January to March 2020. This will facilitate the slow sink to 200 m and the main sink until February 2022. Canadian shutter and lining methods will be employed, the company said. The team is expected to conduct shaft stripping by mid-April 2022 and to dis-establish the site by the end of May 2022, it said.

“There will be no stations or other excavations required, so this will help keep the team in a sinking cycle and optimise production levels,” Blom said. “We will run full calendar operations with 12 hour shifts and cycles of five day shifts, five night shifts and five shifts off.”

A relatively small labour force of 123 people is planned for steady main sinking conditions, with some sub-contractors conducting surface piling and civil works for the winder, headgear and other site construction. Shaft drilling itself will be done with two twin-boom Komatsu shaft drill rigs, and mucking by a Komatsu excavator with close to 1 t of loading capacity.

Blom said ground conditions were expected to be a challenge in some areas, as profiled from the cover and core drilling “However, we have various ways of reducing the risk and downtime during these intersections – such as keeping the shaft lining as close as possible to the shaft bottom,” he said.

Palabora operates a large block cave copper mine and smelter complex employing around 2,200 people, according to the company’s website. It has developed a $410 million underground mine with a production capacity of 30,000 t/d of ore.