Tag Archives: jaw crusher

Tungsten West set to bring Hemerdon tungsten-tin mine back into production

Tungsten West, the mining company focused on recommencing production at the Hemerdon tungsten and tin mine in Devon, England, has announced its intention to proceed with an initial public offering on London’s AIM market.

The company has conditionally raised £39 million ($53 million) before expenses, with plans to debut on the bourse on October 21 with a market capitalisation of approximately £106.2 million.

The net proceeds of the offer, together with the $49 million project financing from a fund managed by Orion Resource Partners, will be used to, among other things, execute the planned capital expenditure and corporate commitments of £44.6 million for improvement works at the Hemerdon Mine, bringing it back into commercial production.

Hemerdon is, Tungsten West says, the third largest tungsten resource globally, as well as being a previously producing mine that was operational from 2015-2018. Tungsten West purchased the Hemerdon Mine in 2019, and has since completed a bankable feasibility study that demonstrated an extensive reserve of approximately 63.3 Mt at 0.18% W and 0.03% Sn, as well as 37.4 Mt of saleable aggregate material. The company estimates that the life of mine is currently 18.5 years with the opportunity to extend this through future investment.

The mine already has the majority of its infrastructure in place, with previous owner Wolf Minerals Ltd having invested over £170 million into the development of the mine and its processing facilities, which include an open-pit mine, mineral processing facility and mine waste facility, the company says. With a substantial amount of existing infrastructure, the development costs associated with re-starting the mine are estimated to be £44.6 million. This existing infrastructure also means that the rebuild is only expected to take 12 months, with parts of the restart project already underway.

Having acquired the mine out of a receivership process, Tungsten West completed a significant amount of work to enable it to understand and address the issues historically experienced by Wolf Minerals, including a 6,113 m geological exploration drilling program and several technical studies. The company has identified the past issues experienced by Wolf Minerals that required rectifying.

“One of the main issues was a poor mineral process route design, with several items of equipment, particularly in the front end of the plant, causing plant downtime and hindering the recovery of the tungsten and tin minerals,” Tungsten West says. “Tungsten West has therefore designated a material proportion of its rebuild costs to modifying and updating the front-end of the processing plant. This will include replacing the existing crushing circuit with new duty and standby primary jaw crushers and secondary cone crushers.”

In addition, the introduction of X-ray Transmission ore sorting, which the company previously carried out tests on with TOMRA Mining in Germany, substantially reduces processing costs by rejecting around 70% of the ore fed to the sorters, it says.

Further upgrades to the plant commenced by the previous operator will be completed, including the dense media separation feed stockpile where 24 hours of surge capacity will be installed, decoupling the front-end of the plant from the concentrator circuit.

“Through these actions, the company expects plant operating time to improve from circa-53% under previous operatorship to the industry standard of circa-81% under Tungsten West,” Tungsten West says.

Tungsten West has identified further opportunities for by-product cash flow through the production and sale of aggregates. A new aggregate plant will be fed with ore sorter rejects and with the waste streams from the processing plant. The business plan is to sell to local aggregate consumers, such as GRS, providing them with a stable, long-term and sustainable source of these materials.

The company says it has implemented a number of initiatives to ensure a minimal impact on the surrounding environment and local community. These include optimising the plants low frequency noise to ensure minimal environmental impact and a fully cash funded £13.2 million restoration bond.

Max Denning, CEO of Tungsten West, says: “With the proposed £39 million raise announced today, and the £36 million funding package from Orion, we will be fully funded for the development of Hemerdon back into production. We look forward to welcoming new investors into this compelling business and working with all our stakeholders to ensure that the newly reinvigorated Hemerdon mine is a beacon of mining excellence in the UK.”

SIMPEC awarded significant Cloudbreak crusher contract from Fortescue

SIMPEC’s relationship with Fortescue Metals Group continues to strengthen, with the engineering contractor set to replace two Metso Outotec Nordberg® C160 jaw crushers at the miner’s Cloudbreak iron ore operation in the Pilbara of Western Australia.

The WestStar Industrial Ltd subsidiary’s new contract for the Hopper 5 Jaw Crusher Replacement project is the first win directly from Fortescue but is far from the first time the company has stepped on site at one of its mines. SIMPEC has previously carried out work on its operations after being subcontracted by the likes of Central Systems, Energy Power Systems, ATCO and others.

The scope of the jaw crusher contract includes removal of all structural and mechanical items required to access the jaw crushers, followed by reinstatement on completion of the change out. It also includes maintenance works and modifications to the existing Hopper 5 hoppers, chutes and screens, SIMPEC said.

Worth A$2.1 million ($1.6 million), the vertical contract has commenced immediately, with works expected to be completed in April.

SIMPEC Managing Director, Mark Dimasi, said: “It has been a long-term goal of SIMPEC to work directly for Fortescue and to break into the field of sustaining capital works. By building our sustaining capital portfolio, SIMPEC aims to achieve a more stable cash flow as well as provide continuity for our workforce.

“This is a very proud moment for the team, and we look forward to successful completion of this project and what we hope will be a long-term relationship with Fortescue.”

Henkel LOCTITE 270 shores up jaw crusher operation in Australia

Henkel’s LOCTITE® 270 adhesive thread locking has come to the rescue of a mining operation in Australia that was facing a potential collapse of the jaw crusher equipment frame.

According to Henkel, the failure of a threaded assembly through self-loosening not only risks lost production but also worker safety. This was the case at the Australia mine site.

The M36 anchor bolts in question had been locked by spring washers that could not rise to the challenge of securing bolts on a piece of equipment subject to continuous vibration and high shear forces, according to Henkel. This resulted in the loosening – and, ultimately, breaking off – of anchor bolts and the collapse of concrete footings.

Spring washers, also known as lock or helical spring washers, are one of the most popular mechanical devices for securing threaded fasteners against self-loosening, Henkel says. The washer is squashed flat when the nut is tightened against the mounting surface so that its sharp edges dig in to prevent the threaded fastener unwinding.

In practice, a spring washer may delay the length of time it takes for the bolt to loosen, but it will not permanently prevent it, according to Henkel. “The main reason is that the split washer does not solve the gapping issue, the free space remaining between the threads of the nut and the bolt,” it said.

On a typical threaded assembly there is just 15% efficient metal-to-metal contact between the threads. Everything else is empty space that enables plenty of side-to-side movement for the bolt. Additionally, being metal itself, a spring washer can cause damage to contact faces and corrode in place.

For the Australia mining operation, this problem was exacerbated by the size of the bolts. The bigger the bolts, the bigger the gap between threads, which leads to more vibrational impact on the assembly. This realisation resulted in the company changing to adhesive thread locking with LOCTITE 270, according to Henkel.

This is a high strength formulation that fills all gaps between the thread and prevents any movement of the bolt within the nut, according to Henkel.

“Secured this way, the assembly is completely vibration-proof but can still be easily dismantled with hand tools for repair and maintenance,” it said. “Additionally, the liquid thread locker seals the threads against humidity and dust, preventing corrosion and surface erosion.”

This simple adjustment to working practice has not only underpinned productivity but contributed to a safer working environment at the operation, Henkel says.

One 50 ml bottle of liquid thread locker is sufficient to secure around 850 M10 bolts but, unlike spring washers, can be used on any bolt size, according to the company.

Metso to help Pavlik Gold double processing capacity

Metso says Pavlik Gold JSC has chosen it as the supplier for the key crushing and grinding equipment for its ore processing plant in Magadan, Russia.

The Pavlik gold plant, which commenced its operations in 2015, currently produces around 225,000 oz/y of gold. With the new equipment, the plant expects to double its ore processing capacity and increase gold production, according to Metso.

Metso’s delivery consists of the primary crushing station with a Nordberg® C160™ jaw crusher, one SAG mill and two ball mills with a total installed power of more than 20 MW. The circa-€25 million ($27 million) order has been booked in Metso’s March quarter orders received, with delivery expected to take place in the first half of 2021.

Alexey Muzychkin, SVP, Russia and CIS, Metso, said: “We greatly value our long-term cooperation with Pavlik Gold, where Metso’s equipment has been in use already for several years. We are sure that the experience and technical competence of both companies in this type of projects will help us rapidly achieve the goals.”

Earlier this month, FLSmidth announced that it would supply a new 7 Mt/y gold processing plant to the mine. 

Metso equipment to rough up diamonds at De Beers Venetia mine

Metso is to install high-performance crushing and material handling equipment underground at the De Beers Group’s Venetia diamond mine, in South Africa, as part of an order booked in the September quarter.

In the throes of a transition from open-pit mining to underground operations, Venetia is reported to produce around 4 Mct/y, making it one of South Africa’s biggest diamond mines.

In 2013, an underground extension project commenced with plans to start producing carats in 2022, climbing to full production in 2025 and extending the mine life to 2046.

Metso said Venetia approached Metso to deliver two primary jaw crushers and a number of feeders. All the equipment will be installed underground, which is a very challenging installation, especially given the shaft constraints (dimensions) and weight limitations for transportation underground, the company added.

Venetia decided on Metso’s Nordberg® C Series™ jaw crusher range as the pinned and bolted design of the crusher allowed for the extensive disassembly, Metso said. “This enhances ease of transportation and installation, especially where there are critical space constraints such as an underground installation – as is the case with this project.”

The Metso apron feeders, meanwhile, are used for extracting or feeding ores that are wet, sticky, dry or even frozen.