Tag Archives: Gruyere

Gekko brings real-time grade measurement to the gold sector

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Gekko has launched “Mark 3” of its online gold analyser, OLGA, the flagship product for the company’s real-time data instrumentation division, which operates alongside other key products such as the Carbon Scout to assist in measuring the recovery of gold real-time in gold processing plants, Nigel Grigg, General Manager – Global Sales & Solutions, Gekko Systems, says.

“We are really excited about these new design elements which will improve value and returns for our clients as well as improve ease of operation,” he said. “Now gold grades can be measured in real time compared with the traditional assay-based process which can often result in two-day delays. Operating management will be able to respond immediately if there is a gold excursion or if the data provides other insights into plant trends. This is a breakthrough technology which is now even more affordable and will deliver higher yields in processing plants.”

The OLGA has at its heart the world-first proprietary “Golden Eye” lens technology developed and designed in Australia’s government-funded CSIRO research laboratories.

This component measures gold grade in slurries and solutions combined including low grade slurry streams down to as low 0.1 parts per million. Other elements are also measured including copper, silver, platinum and nickel. The multiplexing feature will allow for up to four streams within a processing plant to be assessed for gold grades, according to Gekko.

The OLGA is the only real-time online measurement system purpose built for gold, Gekko claims. The unit is typically installed to measure the cyclone overflow stream in CIL leach circuits, around the electrowinning circuit and on flotation feed, tails and concentrate. With the multiplexing function, the OLGA can switch measurement of grade from stream to stream.

“The technology represents a significant step forward in the potential to automate gold leaching circuits,” Grigg says.

Another key feature of OLGA is the dedicated sample feed line, facilitating continuous sampling of large volumes with no potential for cross-contamination. The system also offers additional sample points for ad-hoc samples, providing flexibility and adaptability to changing operational needs. Furthermore, the ad-hoc samples can be analysed as batch samples, minimising sampling errors and substituting the need for other sampling systems.

The OLGA Mk3 has undergone rigorous testing and refinement to ensure its robustness, reliability and accuracy in various operational conditions, while offering low maintenance requirements, Gekko says.

Gekko says OLGA’s development was supported by collaboration partners who assisted and provided critical feedback to improve an earlier OLGA technology design. That collaboration included the management and technical teams at Gold Fields, CSIRO, Orway IQ, Curtin University, METS Ignited and Gekko Systems.

Core to the assessment was an OLGA installation at Gruyere Gold Mine (a JV between Gold Fields and Gold Road Resources) where the OLGA achieved excellent results indicating a strong correlation between the automated OLGA and manual assay data and giving the Gekko team the confidence to further develop the OLGA, Gekko concluded.

MACA takes delivery of first Sandvik DR410i rotary blasthole drill rig at Gruyere

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MACA says the first of six Sandvik DR410i rotary blasthole drill rigs has arrived at the Gruyere gold mine as part of a complete replacement of an ageing mixed fleet at the open-pit operation.

This compact yet imposing rig boasts a single pass depth of 14 m and capacity for holes some 32.3 m deep, further enhancing the capabilities of MACA’s strong fleet at Gruyere, it said. MACA, owned by Thiess, was recently awarded a five-year contract extension at the operation.

Gruyere, jointly owned by Gold Fields and Gold Road Resources, is 1,200 km northeast of Perth. The long-standing partnership began in 2017 and was founded on an aligned focus for safe mining practices and operational excellence.

The strengthened drilling fleet – which will amount to nine rigs in total – will assist MACA to achieve production goals, it says.

The six Sandvik DR410i units will also be joined by two Leopard DI650is and a Pantera DP1500i, representing MACA’s significant investment in leading mining technology to deliver value to clients, it said.

MACA to replace Gruyere open-pit surface drilling fleet with Sandvik rigs

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Leading Australian mining, civil and minerals processing contracting group, MACA, has selected Sandvik Mining and Rock Solutions to supply nine new surface drill rigs as a complete replacement for an ageing mixed fleet at the Gruyere open-pit gold mine in the Western Australian Goldfields, where it was recently awarded a five-year contract extension.

The order, which was booked in the June quarter of 2023, includes six Sandvik DR410i rotary blasthole drills, two Leopard™ DI650i down-the-hole (DTH) drill rigs and a Pantera™ DP1500i top hammer drill rig. Deliveries began in July and will continue through April 2024.

MACA, part of Thiess, has specialised in mining, crushing, civil construction, infrastructure and mineral processing for more than 20 years. It employs more than 3,000 people across operations in Australia and internationally.

MACA has provided various services at Gruyere, a joint venture between Gold Fields and Gold Road Resources, since the contractor initiated bulk earthworks in 2017. Gruyere is expected to produce an annual average of 350,000 oz of gold through a current mine life of at least 2032.

Sandvik DR410i rotary blasthole drill rigs (pictured) are compact, powerful and technologically advanced, the OEM says. They are designed for rotary and DTH holes up to 254 mm, with a mast offering a first pass capability of 14 m and a maximum depth of 32.3 m.

The Leopard DI650i is a self-contained, crawler-mounted, intelligent DTH drill rig designed for demanding high-capacity production drilling applications, Sandvik says, while the Pantera DP1500i is a hydraulic, self-propelled top hammer drill rig, ideal for production or pre-split drilling in large quarries or open-pit mines and construction sites.

MLG Oz makes contract inroads with Ora Banda, Gold Fields, Bellevue Gold

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MLG Oz says it has been selected as the preferred supplier for the provision of haulage and site services at Ora Banda Mining’s Davyhurst site, in Western Australia, on top of receiving a letter of award from Gold Fields for the provision of construction works for the latest tailings storage facility project at the gold miner’s 50% owned Gruyere gold mine (pictured), also in Western Australia.

The company is currently finalising contract execution for a two-year extension, plus a one-year option, to its existing arrangements for the provision of services at Davyhurst. It would come with new commercial terms across the scope of works already being provided negotiated in line with current cost drivers and production expectations, with annual revenue subject to production and performance anticipated to be
approximately A$15 million/y ($10.2 million). This is subject to a contract being signed.

Ora Banda Mining owns an existing centralised 1.2 Mt/y processing hub, as well as additional established infrastructure at Davyhurst.

The letter of award with Gold Fields, meanwhile, is for the provision of construction works for the Gruyere Tailings Storage Facility Stage 4 (TSF) project at the gold mine, a joint venture between Gold Fields and Gold Road Resources. The award is still subject to the final negotiation of contract terms. The anticipated contract length is around eight months, with total revenue of approximately A$17 million subject to final terms and key milestones being achieved.

In addition to this new scope of works, MLG has also agreed to commence haulage services for Bellevue Gold from its open pit to Genesis’s Gwalia processing facility, also in Western Australia. The initial works are expected to commence this month and run for approximately three
months and contribute circa-A$4 million in revenue.

MLG founder, Managing Director and majority shareholder, Murray Leahy, said: “We are very pleased to be able to extend our relationship with Ora Banda Mining and to be able to continue to support their Davyhurst operation under mutually agreed terms. The extension of this contract and the award of the new contracts with Gold Fields and Bellevue Gold are evidence of our strong client relationships, and further demonstrate MLG’s broad capability both in terms of haulage and site services, but also in the support for our growing civil construction business.”

JUWI commissions ‘world’s largest’ solar hybrid project at Egyptian mine site

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JUWI says it has commissioned the world’s largest solar hybrid project at Centamin’s Sukari mine in Egypt, helping the gold miner save more than 20 million litres of diesel a year.

The system consists of a 36 MW solar farm and a 7.5 MW battery-energy storage system, which have been integrated into the existing diesel power station at the operation. This will provide savings of up to 70,000 liters of diesel per day, according to JUWI, resulting in an average reduction in diesel consumption of 22 million liters per year.

The system demonstrates the key role of renewable energies in decarbonising the resource sector and already delivers savings ahead of expectations, according to JUWI.

Centamin noted in October that it was in the final stages of commissioning the solar plant at the operation.

The solar system designed by JUWI has maximised the generation with bifacial solar photovoltaic modules and a single axis tracking system, taking advantage of the high irradiance on site. JUWI Hybrid IQ micro-grid technology enables the integration of the solar and battery system into the existing off-grid network and supports the operation of the existing power station, it says.

The additional benefits of the hybrid power solution at Sukari, according to JUWI, include lowering the site’s carbon emissions by an estimated 60,000 t CO2/y and a subsequent reduction in the volume of diesel trucked to the site, plus a reduction in operating costs

Stephan Hansen, COO and Managing Director of JUWI,said: “We are delighted to have been able to deliver this flagship project to Centamin and, furthermore, to have been able to demonstrate the vital role that dependable solar, wind and battery solutions can already play in the transformation of the resource sector on the de-carbonisation pathway.”

JUWI has already achieved success for mining clients globally with the world’s first utility scale solar battery hybrid project at the DeGrussa Copper mine in Australia. This was followed by Agnew Gold (Australia) in 2019 and another six hybrid projects in Australia and Africa for Tier 1 and Mid Tier miners: Esperance, Pan African Resources, Jacinth Ambrosia, Jabiru, Weipa and Gruyere.

Gekko Systems releases Mark 6 Carbon Scout sampling system for CIL, CIP plants

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The team at Gekko Systems has announced the release of its next-gen Mark 6 Carbon Scout solution.

The Carbon Scout is a self-contained, ground-level sampling system that measures the pH, dissolved oxygen, slurry density and gold concentration in carbon-in-leach (CIL) and carbon-in-pulp (CIP) circuits. An important new feature is the optional X-ray Fluorescence sensor to measure gold on carbon for real-time gold circuit inventory.

The self-contained device collects slurry samples from CIL/CIP tanks to determine the concentration of the activated carbon in the pulp for each tank, to an accuracy of ±0.5 grams of carbon per litre of pulp, Gekko claims. The concentration levels are then used to automate carbon movement to optimise the carbon distribution.

Gekko said: “The Carbon Scout benefits sites by providing real-time data which allows operators to significantly reduce soluble gold loss from the circuit by providing advanced measurements ahead of any unwanted excursions. The Carbon Scout also allows for automation of the carbon movement, minimising exposure to hydrogen cyanide gas and reducing the need for manual handling of samples.”

Constructed from stainless steel, the ground-level system enhances operator efficiency by removing the need to undertake time consuming manual sampling and provides a single point sampling station to improve accuracy and increase safety, according to the company. The automation of carbon movement, meanwhile, increases the efficiency of the process, ensures carbon inventory set points are achieved and reduces the need for operator, metallurgist and other processing staff input.

Some of the sites to have installed the Carbon Scout solution include Gruyere in Western Australia (pictured above on the left with the Gekko OLGA on the right) and Ity in Cote d’Ivoire.

The solution was commercially released in 2017.

Gekko installs OLGA, Carbon Scout solutions at Gruyere as part of collaborative project

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Gekko Systems, as part of a collaborative project to collect and analyse real-time gold reconciliations and automate gold processing plants, has installed its OLGA and Carbon Scout solutions at the Gruyere gold mine in Western Australia.

In October 2020, METS Ignited Industry Growth Centre announced the consortium of Gold Fields, Orway IQ, CSIRO, Curtin University and Gekko Systems as recipients of the Tranche 4 Collaborative Project Funds. The METS Ignited funding will assist the development of this project.

In a world-first, the project draws together a range of technologies, including the Gekko OLGA and Carbon Scout, and skill sets that are the first step to truly understanding what is happening in a gold production plant in real time and will eventually lead to a fully autonomous gold plant, Gekko said.

Gekko recently installed the OLGA and Carbon Scout at Gruyere (a joint venture between Gold Fields and Gold Road Resources), the site where the project will become reality.

“The Gekko OLGA and Carbon Scout will revolutionise the industry’s ability to measure gold circuit inventory and recovery in real time, move it into the digital world and provide opportunity for full automation,” Gekko said.

OLGA is a world first on-stream analyser designed to continuously read low grade gold grades in slurries and solutions, giving operations the ability to see and control their plants in real time, the company says. The alternative traditional sampling methods involve significant delays – of up to one or two days for feedback.

The Carbon Scout is a self-contained, ground-level sampling system to improve carbon concentration measurements in carbon-in-leach and carbon-in-pulp circuits to an accuracy of ±0.5 grams of carbon per litre of pulp. Uniquely, multiple other data points include slurry density, pH, DO and gold loading on carbon, Gekko explained. Data profiles are provided in every tank, every hour.

“The combination of OLGA and Carbon Scout, supported by the Gekko Sample Delivery System, means all CIL/CIP sampling can be done conveniently and safely at ground level,” it said. “Each tank is sampled by a patented pumpless delivery system. All samples in the plant including leach feed and tails will be delivered through this system to potentially alleviate the need for expensive cross-cut samples.”

The team of Orway IQ will deliver the data through the Trinity program. With the MillROC data system and the Gekko technical team using the data for system analytics.

The ultimate aim of the project is to have gold process and recovery data being analysed within minutes rather than days from anywhere in the world and for production to be adapted to reflect this data, Gekko said.

MACA expands WA presence with Mining West acquisition

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MACA Ltd has completed the acquisition of the Mining West business from Downer EDI Ltd, bringing with it four contracts at long-life mining assets in Western Australia.

The Mining West business currently comprises four contracts at Karara (Ansteel), Eliwana (Fortescue Metals Group), Cape Preston (Citic Pacific) and Gruyere (Gold Fields, Gold Road Resources), with each of the four novating successfully to MACA, taking effect from completion, MACA said.

Additionally, in excess of 96% of the Mining West workforce has accepted employment with MACA, the ASX-listed contractor said.

MACA’s CEO and Managing Director, Mike Sutton, said: “Acquisition of the Mining West business will provide MACA with a very meaningful addition of a large-scale mining fleet that is currently engaged across four long-life projects, all with quality customers that are well known to me and other key members of MACA’s management team.”

This fleet comprises 14 excavators and shovels, 65 dump trucks, 11 surface drills and 36 other ancillary machines.

“With the inclusion of Mining West, MACA now has total contracted work in hand of A$3.3 billion ($2.5 billion) at December 31, 2020, that provides a robust revenue base well past financial year 2025. MACA remains very active with its tendering activities and is well placed to pursue a significant number of opportunities across both current and new projects.”

Downer says it will receive over A$200 million in cash proceeds as a result of the sale.

MACA increases open-pit scale by acquiring Downer EDI’s Mining West business

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MACA has entered into a binding agreement to acquire Downer EDI Limited’s Mining West business in a deal that could involve a consideration of A$175 million ($132 million).

Just last week, MACA said it was considering the potential purchase of Downer EDI Limited’s Mining West division as part of a stated plan to explore and pursue growth opportunities that will deliver “value to shareholders on an ongoing basis”.

The Mining West business currently comprises four large contracts at the long-life assets of Karara (Ansteel), Eliwana (Fortescue Metals Group), Cape Preston (CITIC Pacific) and Gruyere (Gold Fields, Gold Road Resources).

MACA’s CEO and Managing Director, Mike Sutton, said the acquisition provided MACA with a very meaningful addition of a large-scale mining fleet currently engaged across these projects. This comprises 14 excavators and shovels, 65 dump trucks, 11 surface drills and 36 other ancillary machines.

The fleet being acquired is currently fully utilised, or in the process of being deployed to projects, with the equipment having mixed life (with machines being on average mid-life). MACA says its due diligence has confirmed the machines are in good working order, having been well maintained by Mining West’s internal plant department.

With the inclusion of Mining West, MACA now has total contracted work in hand of over A$3.4 billion, which provides a robust revenue base well past its 2025 financial year, Sutton added.

Solar and gas power to energise Gruyere gold mine expansion

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APA Group has been contracted to expand the power generation capability of the Gruyere gold project, in Western Australia, as part of a contract that will include the addition of a renewable energy hybrid microgrid, solar power and battery energy storage system.

This news came within Gold Road Resources Limited’s and Gruyere Mining Company’s report on power expansion initiatives at Gruyere, a 50:50 joint venture between Gold Road and Gold Fields, around 200 km east of Laverton.

APA has been contracted to install an additional 4 MW reciprocating gas-fired engine by mid-2021 (Phase 1) and build, own and operate a 13 MWp solar farm and 4.4 MW battery-energy storage system by the end of 2021 (Phase 2) under the existing Electricity Supply Agreement (ESA) that runs until November 2033.

The cost of the Phase 1 and Phase 2 expansion will be amortised over the term of the ESA and is forecast at A$32-38 million ($24-28 million). Phase 1 and Phase 2 will increase the installed power capacity at Gruyere to 64 MW.

The benefits of the sustainable power expansion at Gruyere include:

  • Reduction of carbon emissions by an estimated 16,000 t/y CO2-e;
  • Anticipated 5% power supply unit cost saving (MWh), at current gas market prices;
  • Ameliorating gas power generation capacity constraints, including the derating of gas engine performance at high ambient temperatures;
  • Enable increased plant throughput up to the target of 10 Mt/y;

Gold Road Managing Director and CEO, Duncan Gibbs, said: “Gold Road is proud to be part of this green energy initiative. We have long stated our intention to be an ESG leader, and this initiative follows on from the recent commissioning of a solar and battery power solution at our Yamarna exploration facility.

“The power expansion at Gruyere provides an elegant technical solution that reduces greenhouse gas emissions, decreases costs and enables an increase in plant capacity up to a targeted 10 Mt/y from the current nameplate design of 8.2 Mt/y. This will not only see increased annual cash flow generation for the business, but it will help drive additional unit cost reductions as Gruyere is further defined as a Tier One, low cost and long-life gold producer.”

Gold Fields Executive Vice President, Stuart Mathews, said: “The installation of renewables as part of our total power solution at Gruyere reflects Gold Fields’ strategic objective to strengthen energy security, optimise energy costs and reduce our carbon footprint through the adoption of innovative new technologies. The success of the recently completed renewable energy projects at our Agnew and Granny Smith mines has given Gold Fields the confidence to ramp up use of these technologies across our global operations.”