Tag Archives: diamond mine

Debswana board approves ~$1 billion investment in Jwaneng underground diamond project

Diamond mining, Mine operation news, Mineral project development, Mining finance, , , ,

The Board of Debswana, the 50:50 diamond mining joint venture between De Beers Group and the Government of the Republic of Botswana, has announced approval of the investment for a key development phase of the Jwaneng underground project, paving the way for one of the world’s most valuable diamond mine to transition from open pit to underground operations.

The circa-$1 billion investment in this phase of works, known as the Exploration Access Development Phase, is for establishing a drilling platform to facilitate comprehensive sampling of the kimberlite pipes, delivering the early access decline for the underground mine and developing essential infrastructure to support forthcoming stages of the project.

The initial works, to start in May 2024, follow the successful completion of feasibility studies.

Following the Exploration Access Development stage, the project will be developed in two further phases, Phase 1 mining and Phase 2 mining, to support long-term future production at the mine in an environment of tightening long-term diamond supply.

De Beers Group CEO and Debswana Deputy Board Chairman, Al Cook, said: “Jwaneng stands proudly as the world’s greatest diamond mine. It is a central pillar of both the Botswana economy and the De Beers Group business. The global supply of natural diamonds is falling, so moving forward with the Jwaneng Underground Project creates new value for investors, brings new technology to the country, creates new skills for our workforce and provides new gems for customers around the world. This investment is aligned with our strategy to prioritise investments in the highest quality projects. We are proud to work in partnership with the Botswana Government in creating a bright future for Debswana.”

Since 1982, when the Jwaneng Mine started operating, it has produced an annual average of almost 11 Mct/y. Currently the mine employs 2,100 permanent employees and 3,200 contractors. Pending relevant future Debswana Board approvals, the Jwaneng underground project will ensure a long-term future for the mine while creating new jobs in Botswana and ensuring Debswana continues to make a significant contribution to Botswana’s economy, De Beers says.

Emesent’s Hovermap aids ore pass decision making at Petra’s Finsch diamond mine

Diamond mining, IoT, Mine operation news, Mine surveying, Mining equipment, Mining services, Mining software, , , , , , , , , , , , ,

Highly accurate point cloud data sets from a Hovermap scan have allowed Petra Diamonds’ Finsch mine engineers to “see” the condition of ore passes for the first time and avoid an estimated five months and R5 million ($350,000) in remediation, Emesent says.

Finsch, in South Africa’s Northern Cape, uses ore passes and underground silos to transfer ore between levels or to redirect ore for load and haul to the surface. Blockages, hang-ups, overbreak or scaling can impact the structural integrity and result in extended downtime and significant remediation costs. Accurate imagery enables mine engineers to gauge the integrity of ore passes and plan timely and cost-effective remediation programs, according to Emesent.

Historically, however, scanning and mapping inaccessible shafts and voids has been a challenge for Petra.

The company’s management sought a means of obtaining accurate visualisations of underground voids, quickly and cost effectively, without endangering the safety of Petra personnel or contractors, Emesent says.

Petra management trialled the Hovermap multiple data capture methods with Emesent partner, Dwyka Mining Services, contracted to carry out multiple scans of an indoor stockpile, ore passes and vertical shafts, and a series of access tunnels and ramps.

Hovermap is a drone autonomy and LiDAR mapping payload. It uses the LiDAR data and advanced algorithms on-board, in real time, to provide reliable and accurate localisation and navigation without the need for GPS.

Dwyka spent a day on-site conducting a series of scans using Hovermap mounted to vehicles, a DJI drone, or lowered in a protective cage. Dwyka delivered point cloud data sets for Petra’s survey team to geo-reference and analyse, within 24 hours. It also provided visualisations of the ore passes, enabling the mine engineers to ‘see’ the condition of orepasses for the first time, Emesent said.

Alex Holder, Group Planning and Projects Lead at Petra Diamonds, explained: “We lowered Hovermap down ore passes, flew the drone into draw points and even scanned our shaft and ramps by fixing the scanner to one of our vehicles. The visualisation delivered exceeded all our expectations. The data captured in one ore pass saved us significant time and effort by confirming it was irreparable. That saved us millions.”

Using Hovermap led to an immediate decision to abandon plans to expend resources remediating a compromised ore shaft. This decision saved Petra an estimated five months and R5 million.

Heinrich Westermann, Mining Engineer at Petra Diamonds, said: “The ability to power and switch the Hovermap payload between the various applications meant that we were able to scan a considerable amount of the mine in one shift. Generally, this was either impossible and, if it were possible, it would take weeks to collect those datasets and months to see the final visuals.”

The data collected by Hovermap has become the basis of a data library for the site. It is augmented regularly and used to inform operational decision making by Petra’s mine planning and survey teams, according to Emesent.

Petra intends to deploy Hovermap scanning technology to map inaccessible locations at its other sites across Africa, Emesent says.

Kwatani problem solving doubles diamond mine’s screening feed rate

Comminution of minerals, Equipment maintenance, Mine operation news, Mineral processing, Mining equipment, Mining services, , , , , ,

Kwatani says it has helped a South Africa diamond operation double the feed rate of its degrit screen through the use of one of its customised solutions.

The customer was operating several multi-slope screens to dewater product between 0.8 mm and 5 mm in size, before it was treated by dense medium separation (DMS). However, the screens were causing a severe carry-over of water onto the conveyor belt to the DMS, according to the South Africa-based OEM.

“The feed rate on each screen was being limited to about 250 t/h,” Kwatani CEO, Kim Schoepflin, said. “We tackled this by designing and manufacturing a customised multi-slope screening machine to fit the customer’s existing footprint.”

Schoepflin said Kwatani’s replacement was able to double the feed rate to about 500 t/h, with minimal water carry-over.

As a result of the success of this unit, the customer requested Kwatani to replace the whole bank of screens, it said.

In another contract, a customer asked for assistance with underperforming screens that could not deliver the original design parameters. They also wanted to increase the tonnage throughput by 17%, according to the company.

“We conducted a careful evaluation in collaboration with the customer, and came up with an innovative and economical solution,” Schoepflin said. “Simply replacing the existing screens with Kwatani’s new larger screens would have been costly and time consuming, so we decided instead to replace the screen’s existing gearboxes.”

The replacement gearboxes delivered greater vibration, but without exceeding the output torque the existing motors driving the gearboxes could provide.

“Drawing from our portfolio of locally designed and manufactured exciter gearboxes, we were able to implement this solution very quickly,” she said. “The two new exciter gearboxes were delivered to site and were in operation within two weeks – successfully and immediately increasing the screen’s throughput.”

The benefits to the customer did not stop there, according to Schoepflin. The newly optimised operating parameters meant the material bed depth was lower, so the drive motors drew a lower amperage and reduced the cost of power consumed.

“Our customised screening and feeding solutions – developed by our in-house team of experienced mechanical engineers and metallurgists – are based on consultation with each customer,” she explained. “The result is a design that delivers the optimal processing performance and tonnage at the lowest cost of ownership.”