Tag Archives: tailings management

Global tailings standards likely to ‘raise industry up’, SME delegates hear

Environmental, IoT, Mining events, Sustainable mining, Water management, , , , , , , , , , ,

The keynote session at the 2020 SME MineXchange Conference and Expo, in Phoenix, Arizona, acted as a display of just how far the industry has come in the battle to improve transparency and shore up environmental, social and governance (ESG) practices in the face of increased scrutiny over the security and safety of tailings dam facilities.

All speakers involved in the keynote session – representing Freeport McMoRan, The Mosaic Company, Newmont and CONSOL Energy – gave a rundown of how many tailings dam facilities they had on their books, how the operation of these dams had changed since recent high profile failures and what they were doing to improve further.

Yet, with the International Council in Mining & Metals (ICMM) nearing the release of its well-documented Global Tailings Review, the session also highlighted how the industry is wary of trying to apply all-encompassing tailings legislation.

Nancy Case, VP, Environment, Health & Safety for The Mosaic Company, revealed that the company has eight active dams, alongside five inactive dams in Brazil and, in New Mexico, it had five tailings management facilities (TMFs).

Since the Corrego do Feijão mine dam collapse just over a year ago, Case said the company had brought in fully-independent engineering firms that had never worked on any of the dams to evaluate the structures and monitoring procedures in place. In Brazil, the company had also amended its operations to fall in line with new regulations.

This process led to several dams being taken out of operation – with additional buttressing and full centreline work carried out where necessary.

Red Conger, President and COO of Americas for Freeport McMoRan, said tailings management was a big challenge the company acknowledged many decades ago.

He spoke about how the company was using technology such as wireless piezometers to monitor tailings dam levels at its operations. At the Bagdad mine, in Arizona, specifically, the company is also using a satellite radar system for monitoring purposes.

Daniel Connell, VP Business Development & Technology, took the technology talk one step further, explaining the company, in partnership with OMNIS Bailey, was working on an innovative technology to convert waste coal slurry into two products: a high-quality carbon product to be used as fuel or as a feedstock for other higher-value applications; and a mineral matter product with potential to be used as a soil amendment in agricultural applications.

The company has, so far, constructed a 2 t/h pilot plant at its Pennsylvania Mining Complex (PMC), and Connell said the company is looking to scale this up to a commercial installation that could not only reduce the amount of tailings the company stores at the facility, but also, potentially, process existing tails.

Out of the four mining company representatives on stage, Newmont declared the most TMFs – 89 in total. Dean Gehring, EVP & CTO, was keen to point out that the gold miner took a “process safety approach” to handling these facilities.

Newmont, as has been well documented, is looking into tailings stacking solutions as well as EcoTails with FLSmidth to reduce its exposure to wet tailings dam facilities.

All representatives agreed technology developments in this space should be treated like those developed to improve safety – where proprietary technology arguments are put on the backburner to help the industry advance.

After each mining company representative had been given a chance to provide some context as to why they were up on stage about to be asked the tricky tailings questions everyone in the industry wanted to know, the moderator’s questions started.

What it revealed, even among just four companies, was the different ways miners operate and manage tailings dams.

Each company had operations in different countries, with different cultures and with different geotechnical requirements.

CONSOL’s Connell, in response to a question about would the company look to decommission any ‘upstream dams’ in its portfolio – constructions that have faced increased scrutiny since the dam failure in Brazil in January – said the coal miner had no intention of stopping these. “We intend for that to be our practice going forward,” he said referring to the dam in question at the PMC.

Mosaic’s Case, meanwhile, said the company had gone as far as taking one tailings dam out of service since the Bruamidinho collapse last year, with decommissioning lined up.

Case was the first one to answer the question on applying a global tailings standard across the industry, explaining it would be very difficult to “enforce” this – most probably because of the differing operating practices seen across the industry.

“There are a lot of differing opinions on those standards,” she said. Depending on the region in question, applying certain standards could impact competitiveness, she offered up as one example of these varied opinions.

This may have been one of the reasons why Freeport’s Conger said the company was supportive of having a global tailings standard, but would withhold judgement on if the miner would follow all recommendations until the detail had come out.

Gehring, meanwhile, compared the new standards to what the gold sector had seen with the cyanide code years ago. “It will take some time to work through,” he said, referring to this example.

What was clear from this session is that any company that follows the guidelines likely to come out of the ICMM’s Global Tailings Review is likely to be considered a leader within the sector. This comes with benefits.

Case said: “Where I do see it (the standards) becoming really beneficial is allowing companies to show they are at the forefront of this.”

This is likely to have a positive impact on the way investors and insurers view such companies, she explained.

“I think it is really going to raise the industry up.”

Weir to expand tailings dewatering offering with new ‘innovative’ solution

Bulk handling, Environmental, Mining equipment, Mining services, Water management, , , , , , , ,

As the Global Tailings Review prepares to issue a new industry standard in 2020, Weir Minerals has chosen now to examine the subject of dewatering tailings.

The company, already offering solutions to help dewater tailings, says it is developing an “innovative tailings dewatering solution” to allow operators to pump slurry containing an extremely high percentage of solids. It says it plans to launch the new technology in 2020.

Mike Swintak, Regional Senior Product Manager for Weir Minerals, said dewatering tailings can be a difficult process, yet, when undertaken successfully, “it can deliver significant benefits to mine operators”.

The foremost benefit of dewatering tailings is the reduction of water that needs to be transported from a process plant to a tailings storage facility (TSF).

Reduced water content means tailings slurry volume is decreased, allowing for smaller pipelines and pumping equipment to be used. This can also minimise power requirements.

Thickened tailings and paste can improve the stability of TSFs and diminish their footprint. In some instances where existing TSF capacities are limited by regulatory or other environmental considerations, thickened tailings can help to extend the life of the mine, Weir says.

“Proper containment of tailings reduces the risk to people and the environment, and when decommissioning a mine, thickened tailings facilities are easier to rehabilitate,” the company added.

To a growing extent, thickened tailings are also used for underground mine backfill. This can increase productivity and reduce mine cycle times as well as surface TSF disposal volumes. Underground mining conditions can also be improved due to decreased water and slimes handling.

Important considerations and challenges

“When tailings are not properly managed, the results can be lethal. It is vital that mine operators have a clear understanding of key risks and considerations related to this process, in particular, tailings dewatering,” Swintak said.

Every mine site is different and subject to varying environmental, regulatory, capital and operating cost constraints.

Cost is a key consideration for many operators and can adversely affect the viability of a mine site, according to Weir. Therefore, it is necessary to implement a tailings management strategy that provides both reliability and value for money.

“Environmental limitations are also a major factor when establishing a TSF,” Weir says. “In parts of the world where there is challenging topography, such as mountainous regions or other environmentally sensitive landscapes, TSFs may need to be built further away from the process plant. This can result in slurry being transported across longer distances or higher elevations. Dewatering of tailings is a viable option in these scenarios as less slurry needs to be moved, in turn reducing operational costs.”

Some operations produce highly diluted tailings that require extensive dewatering to reach the desired level of thickness. Other slurries may contain extremely fine particle solids that are also difficult to manage. Large mine sites, or those with complex orebodies, can produce many types of tailings waste slurries, which may require varying methods of treatment.

“Across this multitude of situations, the operator must determine all associated costs and assess the level of dewatering required to confirm the most suitable solution for their site,” Weir says.

“While some mines are in a position to increase the size of their TSFs, many are not, and must implement a viable dewatering process, which can involve significant capital expenditure.”

If dewatering tailings to the highest possible degree, operators also need to develop a suitable strategy for transporting the waste material. Tailings that are too thick to be pumped may need to be transported by either a conveyor system or truck.

Finally, when a mine site reaches the end of its life and moves into the decommissioning phase, TSFs must be dealt with in accordance with regulatory and legislative requirements. As many mine sites need to be rehabilitated and restored to a natural state, a key benefit of producing thickened tailings is its ability to be covered with overburden and re-planted with suitable vegetation.

Weir Minerals offering

“Weir Minerals realises dewatering tailings can be a daunting process for many operators,” it says. “In order to provide the highest level of support and service, the company has invested heavily in its tailings management capabilities. More than just a supplier, every mine site is assessed on a case by case basis to provide a complete tailings dewatering system customised to the customer’s applications and constraints.”

Swintak added: “From developing flow sheets and process requirements to supplying equipment including dewatering systems incorporating our Isodry thickeners and filters, Multiflo floating and mobile pump systems for use on tailings ponds, or GEHO positive displacement pumps capable of transporting high density slurries up to 200 km, we provide customers with peace of mind through our tailings solutions.”

A key point of difference, according to Weir, is the intensive pilot plant testing Weir Minerals can perform at the Weir Technical Centre in Australia. This facility is designed to test tailings samples from around the world to help ascertain the best way to process them in line with the customer’s requirements. Testing is conducted using thickeners/clarifiers, hydrocyclones, filters and centrifuges, as well as a comprehensive pipe loop facility for determining high density slurry pipeline design.

Weir Minerals can also conduct testing at customer mine sites to assess the viability of various tailings management strategies.

As the mining industry gains a better understanding of tailings, it is vital new and improved methods of containment and storage are developed.

“Weir Minerals believes that the dewatering of tailings has a fundamental role to play in this, and continues to push the boundaries of possibility,” it said.

Global Tailings Review opens public consultation period

Environmental, Mining industry recognition, Water management, , , , ,

The ICMM-backed Global Tailings Review has launched a public consultation on its draft Global Tailings Standard in order to “develop a robust, fit-for-purpose international standard for the safer management of tailings”.

The public consultation, which ends on December 31, will take place in two parts.

First: online via a survey which has been translated into seven languages. Second: in-country consultations across a range of mining jurisdictions in the northern and southern hemispheres.

The Global Tailings Review was co-convened by the United Nations Environment Programme, International Council on Mining and Metals (ICMM) and Principles for Responsible Investment following the tailings dam collapse at Brumadinho, Brazil on January 25, 2019, to establish an international standard on tailings facilities management. The final Global Tailings Standard will need to be endorsed by all three parties.

The draft standard addresses six key topics:

  • Knowledge base – requires mine operators to develop knowledge about the social, economic and environmental context of a proposed or existing tailings facility;
  • Affected communities – focuses on the people living and working nearby. It requires human rights due diligence and meaningful engagement of project-affected people;
  • Design, construction, operation and monitoring of tailings facilities – aims to review design, construction, operation and monitoring of tailings facilities;
  • Management and governance – focuses on ongoing management and governance of tailings facilities. It defines a number of key roles, essential systems and critical processes;
  • Emergency response and long-term recovery – covers emergency preparedness and response in the event of a disaster, the re-establishment of ecosystems, and the long-term recovery of affected communities; and
  • Public disclosure and access to information – requires public access to information about tailings facilities in order for all stakeholders to be informed of the risks and impacts, management and mitigation plans, and performance monitoring.

“The review is committed to transparency and once the final standard is published, the Global Tailings Review will provide a consultation report that reflects feedback, key themes, topics and sentiments from different stakeholder groups, as well as how that feedback was processed and addressed in the final version of the standard,” the ICMM said.

It is expected that the final standard and accompanying recommendations report, which will outline broader proposals to support the uptake and implementation of the standard, will be published in 2020.

GlassTerra IoT LiDAR monitoring solution being trialled at Mount Morgan mine

Base metals, Environmental, IoT, Mining safety, Mining services, Precious metals, Water management, , , , ,

Queensland, Australia-based technology startup GlassTerra says it is collaborating with a global satellite connectivity company to conduct a proof of concept project to monitor a key embankment in real-time at the former-operating Mount Morgan mine.

Mount Morgan, which was a copper, gold and silver mine that operated up to 1981, is now abandoned and managed by the Queensland Government’s Department of Natural Resources, Mines and Energy.

GlassTerra has installed one of its Internet of Things LiDAR sensors at Mount Morgan to demonstrate the safety benefits of real-time tailings embankments monitoring. The collaboration will showcase the integration of this technology with GlassTerra’s geospatial platform and global satellite connectivity to achieve highly reliable real-time monitoring of tailings embankments, GlassTerra said.

GlassTerra Chief Customer Officer, Sophia Li, said the combined solution will demonstrate the ability to conduct real-time monitoring of unplanned movements of earth and other parameters, on embankments such as tailings facilities.

“Real-time monitoring of embankments enables prompt reporting, investigation and mitigation of any changes, which can enhance safety, improve the protection of our environment and advance the social performance of the mining industry,” Li said.

It also has potential applications in the 3,500 tailings storage facilities in the global mining sector. This project has already led to GlassTerra securing a contract for real-time tailings embankments monitoring in Africa, the company said.

BHP stresses importance of ‘social value’ in strategic decision-making

Careers in mining, Coal technology, Environmental, Mining industry recognition, Mining safety, Power supply for mines, Sustainable mining, Water management, , , , , ,

While many miners look to emphasise the way they obtain and retain their social licence to operate during exploration, development and operations, BHP said this week that “social value” plays an important role in its decision-making.

At a briefing in London on October 8, BHP Chief External Affairs Officer, Geoff Healy, said: “We are moving from a position of maintaining ‘a social licence’ to creating ‘social value’.

“For us, it is – plain and simple – good business. We are part of a society that expects more of us. We recognise that our success depends on our ability to earn their trust and confidence. And we know that this means changing the way we do business at all levels, from local to global.”

Healy said that when the company makes business decisions, both financial value and social value considerations come into play – “each depends on the other for the decision to be effective”, he added.

During the briefing, Healy said the company makes a relatively small number of large, long-term capital investments that are structurally immobile – “we can’t just close up the factory and relocate when the going gets tough”. This means when BHP invests in a region, it becomes part of the local community for decades, with the miner, sometimes, creating those communities.

“Our portfolio is simple – yet the inherent risks are complex and wide-ranging,” he said, explaining that circa- 80% of the company’s EBITDA is concentrated in Western Australia, Queensland and the northern Atacama region of Chile; 55% of its revenue is derived from China; and over 80% of its products emit CO2 in its customers’ value chain.

“An imbalance in our community relations in a few locations has the potential to fundamentally impact our business: from a reset of fiscal terms, to the refusal of necessary permits and approvals,” he said.

“A disorderly transition to decarbonisation has the potential to threaten the viability of entire commodities in our product suite. And a social and environmental disaster, such as another significant tailings dam failure, has the potential to be existential.”

On the flipside, he said BHP knows that if it manages well its transition – “from ‘social licence to value’” – it will create a “core competitive advantage that will be hard to replicate”.

“Retreating, or seeking a quick, short-term fix, will not work. Getting it right will be differentiating, and value creating,” he said.

In this context, Healy reviewed the results of some of the investments and initiatives the company has undertaken, which has seen the number of high potential injuries reduced by more than 40% in the last three years, the number of women hired since 2015 trebled and over $1.7 billion invested in social programs in the last decade.

Healy said: “All of these commitments stand for nothing unless we hold ourselves to account and are transparent.

“We have made public our emissions targets, our water stewardship efforts, and the taxes and royalties we pay.”

Coming back to the move from ‘a social licence’ to creating ‘social value’, Healy said this transition protects BHP’s business today and positions the company to take advantage of future opportunities.

He said: “To obtain access to the best resources, we must be the partner-of-choice for governments.

“To secure the best talent, we must be committed to making a positive societal impact.

“And, to secure the best partners, we must be trusted by our community partners.”

‘Access’ is the key word here, Healy said, with there being two sides to that word: “One, protecting and maintaining the access we currently have. And, two, securing access to new resources, new talent, and new partnerships to take full advantage of future opportunities.”

In addition to the company’s targets to reduce greenhouse gas emissions, with the recent $400 million investment in technologies to reduce emissions from both BHP’s own operations, as well as those generated in its value chain being the obvious example, BHP is also looking to play its part in ensuring tailings management standards are lifted across all of industry and transforming the way it is managing water and power at Escondida.

The latter includes moving to 100% desalinated water over the medium term and transitioning to 100% renewable power with BHP in the late stages of securing a long-term contract for renewable power supply that could “deliver significant cost savings relative to our current gas-fired supply”, Healy said.

He concluded: “We know that when we consider social impacts in our decision-making; and when we build respectful and mutually beneficial relationships, we create sustainable value for all of our stakeholders; and in particular for our investors.

“We are determined to assess and communicate our progress regularly and transparently.

“And we expect to be judged on the results we produce and the value we create, for you as investors, as well as our broader stakeholders.”

Outotec consolidates filtration expertise with new Larox PF-DS filter press

Automation, Environmental, Mining equipment, Mining services, Water management, , , , , ,

Outotec says its new Larox® PF-DS tower press filter combines two proven technologies in one unit to meet the challenging process requirements of the chemical process industry.

With filtration applications getting more demanding due to challenging materials, increased cake washing needs, strong acid processes, and fine grinding, there is an increasing need for technologies that can handle these challenges in a reliable and more automated manner, Outotec says.

The new Larox PF-DS is a tower press filter where the plate pack is composed of polypropylene membrane filter plates stacked on top of each other. The cake forms between the closed filter plates on the top and bottom side of the filtration chamber, hence it being called a double-side filter.

The mechanical operation and frame of the Larox PF-DS are shared with the Outotec Larox PF pressure filter while the unique filtration process is powered by the double-side plate pack from the Outotec Larox DS filter (earlier known as Hoesch® DS).

The individual filter chamber has a double-side filtration area of 4.7 m2 and an operating pressure of up to 16 bar. The plates are stacked vertically to give a total filtration area of 38–94 m2 depending on the unit size, according to Outotec.

One endless filter cloth runs through the whole filter and one side of the filter cloth is used for filtration. A wide range of different cloth types is available to meet the application needs, the company said. This filter cloth ensures efficient discharge of all cake from each individual chamber at every cycle, eliminating the need for manual intervention.

With the PF-DS now sharing the mechanical design with the PF family, local Outotec service teams are available for technical support and maintenance needs. Likewise, the availability and compatibility of the spare parts is significantly improved compared with earlier technology.

Outotec said: “PF-DS Filters are fully automatic, operating either with a standalone panel or through a distributed control system. Automation extends beyond basic filter sequencing to full process control, ensuring consistent results under varying process conditions.”

The filtration process is a batch operation which includes filtration, membrane pressing and air drying stages, with several options for cake washing added to the process depending on customer needs.

When the process cycle is ended, filter cakes will be discharged from the one side of the filter. Due to the cloth being on both sides of the chamber together with the cloth scrapers, cake discharge is fully automatic without an operator present.

After each cycle, the moving filter cloth passes through water sprays to remove any embedded solids. This maintains cloth permeability, consistent filter performance and extends cloth life, according to Outotec.

The single cloth system makes cloth change simple and quick, typically taking as little as 30 minutes. Furthermore, cloth inspection can be carried out without the need for equipment shutdown.

Australia miners pool expertise to improve tailings management

Environmental, Mineral processing, Mining industry recognition, Mining services, Sustainable mining, Water management, , ,

Australia’s minerals industry is looking to confront the tailings management issues that have plagued the global industry in recent years with the release of the Australian Mining Tailings Communique.

The Minerals Council of Australia (MCA) will support the communique, developed by MCA member companies after a workshop earlier this year, with a program of training, research and governance actions currently in development, it said.

Opportunities will be identified to build industry expertise and enhance technical capacity on tailings management for the minerals workforce, the MCA added.

“Tragic incidents around the world over the past decade reinforce the need for ongoing vigilance, review and change and raise legitimate questions about tailings management practices from governments, investors and the community,” the council said.

Australia’s minerals industry met earlier this year to review governance, culture and risk management for tailings storage facility management.

While the MCA said current tailings management practices in Australia are “highly regulated and at the forefront of global best practice”, it said the industry is committed to continual improvement as part of its culture of safe and responsible resource development.

This saw the companies, develop a list of actions to take on. This included:

  • Communicate and engage – communicate and engage with the community including government and other key stakeholders on our approach to tailings management in a transparent manner to build community confidence;
  • Leadership, governance and systems – assess and identify key elements of corporate leadership, culture, systems and governance to proactively manage tailings risks and share information;
  • Share leading practice – continue to actively share and promote industry leading practice and lessons learned in Australia and overseas from all industries;
  • Build industry expertise – identify opportunities to enhance industry capacity in key technical aspects of tailings management; and
  • Engage internationally – offer Australian expertise to help build global initiatives on tailings management including the development of, and alignment to, standards and guidelines.

The MCA says it will develop a program of work to reflect the above actions by the end of 2019.

“There is no room for complacency and honest and transparent communication and engagement with the workforce, host communities, governments, investors and other stakeholders is central to the industry’s approach,” it said.

Weir highlights Enduron HPGR and Terraflow tailings demand in H1 results

Comminution of minerals, Environmental, Equipment maintenance, Mineral processing, Mining equipment, Mining finance, Mining maintenance, Mining services, Sustainable mining, Water management, , , , , , , , , ,

The Minerals and ESCO divisions continued to stand out in Weir Group’s half-year 2019 financial results, with the two mining focused segments now representing around 75% of group revenues.

The Weir Group recorded revenue of £1.3 billion ($1.6 billion) in the first six months of the year, up from £1.07 billion a year earlier prior to the ESCO acquisition. Operating profit, meanwhile, was £172 million, up 25% year-on-year, with the Minerals division posting an operating margin of 17.2% and ESCO recording a margin of 14.1% (up 300 basis points from a year earlier).

In addition to Minerals and ESCO now commanding some 75% of group revenues, the two’s recurring aftermarket sales also now represent about 80% of total revenues.

In the first half of 2019, Minerals orders grew 5% with aftermarket orders up 8%, reaching record levels, according to Weir. “Original equipment orders, which are traditionally lumpier, fell by 2% year-on-year, but returned to growth in Q2 (June quarter) and this is expected to accelerate in the second half,” the company said.

ESCO, meanwhile, recorded a 5% increase in pro-forma revenues to £280 million, with annualised cost savings of $20 million ahead of schedule when it comes to the company’s medium-term target of achieving $30 million synergies.

During the period, original equipment demand within the Minerals segment benefited from miners continuing to expand current operations and investment in new mines, with demand for new technologies that increase efficiency and sustainability while lowering total costs, Weir noted.

This included strong demand for the company’s Enduron® HPGR (high pressure grinding roll) technology that reduces water and energy consumption, the company said, adding that the company had been contracted to support a large greenfield development in the UK in the period.

Weir said it also saw growing interest in its Terraflow® solution to enable tailings waste to be cost-effectively recycled or repurposed. This equipment brings wet tailings down to 90% solids paste to be pumped into a containment area or used for paste backfill.

The company added: “Aftermarket demand was strong, due to production growth and structural trends. These include continued ore grade declines that increase the amount of rock that needs to be processed, intensifying wear and tear and leading to additional demand for spares and services,” the company added.

During the period, Weir also added a new Minerals service facility in Alaska, which, it said, gives the division the ability to rapidly respond to demand for spares and services and is a “key differentiator in need-it-now mining markets, where production intensity is increasing, and the costs of unplanned downtime are significant”.

The company’s technology work continued to focus on incremental innovations and “Mine of the Future developments” aimed at solutions that are smarter, more efficient and sustainable, Weir said. This included focusing research and development on new pump and alloy designs, digitisation, ore hoisting, hybrid separation and tailings management.

Weir ESCO benefited from the same macro mining trends as its Minerals segment including increased ore production and the focus by mining customers on optimising productivity, the company said.

“This supported demand for differentiated technology that is proven to sustainably increase efficiency,” it said.
The first half of the year saw early market share gains for the N70 Nemisys® lip system, which extends the division’s Nemisys technology – featuring a cast or plate lip with shrouds and a three-piece tooth system. This is currently being trialled on smaller machine classes including wheel loaders, Weir said. “The N70 improves customer productivity through increased wear life, lower fuel consumption and reduced maintenance costs.”

The company also launched its GET Detect System during the period, an innovation it worked with Australia’s Mining3 on that provides instant feedback to the machine operator if one of the ground engaging tools used to extract minerals is lost or damaged.

Vale’s Vargem Grande iron ore complex slowly coming back to life

Environmental, Mine operation news, Steel and iron ore, Water management, , , , , , , , , , , ,

Vale says Brazil’s National Mining Agency (Agência Nacional de Mineração – ANM) has authorised the partial resumption of dry processing operations at the Vargem Grande Complex in Minas Gerais.

The Vargem complex is comprised of three operating mines — Capitão do Mato, Tamanduá and Abóboras — and produces a mixture of fines, lump and concentrate products for the seaborne export market and the Vargem Grande pellet plant.

Vale said all operations of the complex were suspended by ANM on February 20, to prevent “occasional triggers” that could affect tailings dam stability as a result of ongoing activities at the complex.

Vargem was one of several operations that were suspended after one of Vale’s tailings dams ruptured at its Córrego do Feijão mine (Paraopeba complex) on January 25, 2019.

The decision will enable the partial resumption of dry processing operations at the complex within 24 hours, totalling about 5 Mt of additional production in 2019, thus increasing the supply of Brazilian Blend Fines, Vale said.

The Brazil-based miner reaffirmed its 2019 iron ore and pellets sales guidance of 307-332 Mt, as per previous announcements.

Coringa dry stacking plan finds favour with state environmental agency, Serabi says

Environmental, Mineral exploration, Mineral project development, Mining project news, Mining safety, Precious metals, Sustainable mining, Water management, , , , , , , ,

With Serabi Gold having supplied all required data for a preliminary economic assessment (PEA) on its Coringa gold project, in Brazil, to its independent consultants Global Resource Engineering Limited, CEO Mike Hodgson says the London- and Toronto-listed firm is now working hard on the permitting side.

Permitting a mine in Brazil – in particular the waste storage element – has become a lot trickier in the past few years following two major tailings dam collapses at iron ore mines in the country.

But, in the company’s June quarter results, Hodgson said Serabi was making good progress on permitting Coringa, a deposit that comes with 216,000 oz of indicated resources at an average in-situ grade of 7.95 g/t Au and inferred resources of 298,000 oz at 6.46 g/t.

He said: “The plan to replace a conventional tailings dam with installing a filtration plant allowing for the dry stacking of tails has been well received by the state environmental agency, SEMAS, who had already approved the original environmental impact assessment (EIA) on the basis of a conventional dam.”

The company is now completing an amendment to the EIA to reflect this design variation, he said, explaining that Serabi expects SEMAS to approve the amendment and, then, proceed with the necessary public hearings.

“We hope to be in a position to receive the Preliminary Licence during the second half of the year,” he said.

Coringa is located in north-central Brazil, in Pará State, 70 km southeast of the city of Novo Progresso.

Artisanal mining at Coringa produced an estimated 10 t of gold (322,600 oz) from alluvial and primary sources within the deep saprolite or oxidised parts of shear zones being mined using high-pressure water hoses or hand-cobbing to depths of 15 m, according to Serabi. Other than the artisanal workings, no other production has occurred at Coringa.

Serabi acquired Coringa from Anfield Mining on December 21, 2017, with management considering the asset to be very much a “carbon-copy” of Palito in terms of the geology, size and mining operations that will be used. The company’s Palito complex is made up of high grade, narrow vein underground mines that produce around 40,000 oz/y of gold.

The PEA on Coringa is still expected to be completed by the end of July, Serabi said.