May 17, 2020

Wolf Minerals and the Drakelands tungsten mine

mining
Tungsten
drakelands tungsten mine
Wolf Minerals
Dale Benton
3 min
Wolf Minerals and the Drakelands tungsten mine
A £130million tungsten mine in the UK has been given the keys to the future, following the extension of planning consent and permission to increas...

A £130million tungsten mine in the UK has been given the keys to the future, following the extension of planning consent and permission to increase production.

The Drakelands Mine project, owned by Wolf Minerals Limited, is now permitted to operate on-site crushing plant seven days a week as well as an increased planning permission until 2036 from its original expiration in 2021.

The Drakelands Mine

Construction of the Drakelands Mine began on site in March 2014 and was completed on schedule in June 2015, with deliveries to customers commencing in September 2015.

The Drakelands Mine is rated by the British Geological Survey as the world's fourth largest tungsten resource and it provides a secure supply of tungsten for a global customer base. A tin concentrate is also produced, generating additional revenue for Wolf.

Located near the village of Hemerdon in the United Kingdom, the Drakelands Mine is a world-class tungsten and tin mine, one of only two mines outside of China with production capacity greater than 3,000tpa tungsten concentrate.

The extraction of tungsten at Drakelands takes place through open pit mining, with the pit measuring 850m long by 450m wide and ultimately extending to a depth of 260 metres. The sides of the pit will be cut in benches to allow for safe working as the mine gets deeper.

Ore removed from the pit is stockpiled according to its mineralogical characteristics and grade in preparation for use in the processing plant.

Waste rock from the open pit is loaded by excavators onto dump trucks and driven on internal haul roads to the mine waste facility (MWF). The material being deposited in the waste facility is classified as non-hazardous.

The MWF is designed to be inherently stable. Its construction consists of a rockfill embankment progressively constructed from run-of-mine waste. Finer residues (tailings) are contained within this embankment and allowed to settle, with the excess water pumped back to the processing plant for recycling.

Processing Plant

The Drakelands processing plant produces tungsten and tin concentrates. Ore is fed into the processing plant where it is crushed and ground to liberate the minerals from the rock, and then separated and upgraded using various gravity, heavy media, flotation and magnetic processes.

The processing plant will produce approximately 5,000t tungsten concentrate and 1,000t tin concentrate each year – equivalent to 1 truck a day exported to customers in Europe, USA and Asia.

Way of the Wolf

Wolf Minerals is an ASX (WLF) and AIM (WLFE) listed specialty metals producer from its operations at Drakelands, a major global tungsten mine  in the United Kingdom's Southwest.

The company  is led by an experienced management team of British and Australian mining professionals and more than 200 people are permanently employed on site.

Wolf is committed to displaying leadership in health, safety and sustainable development and is working proactively to manage its impact on the environment.

 

 

The November issue of Mining Global Magazine is live!

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Get in touch with our editor Dale Benton at [email protected]

 

 

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May 5, 2021

Mining 4.0: How innovation is shaping mines of the future

Bently Nevada
Baker Hughes
Digital Transformation
Industry 4.0
Benjamin Byrne & Chris Engdahl
8 min
How mining's place in the fourth industrial revolution holds the key to the world's carbon neutral future

Mining may be the gateway to the world’s carbon neutral future.  Green energy storage systems, for one, are largely dependent on minerals. According to the World Bank Group, clean energy needs will escalate demand for rare earth minerals by nearly 500% by 2050.

While this growing demand holds much promise for mining companies, it also creates new challenges. Mining operators must navigate the ever-present highly cyclical market conditions and capital-intense operations. Recent trends layer on additional challenges, such as the progressive retirement of the industry’s most experienced workers, increasing regulatory pressures, and rising energy costs. To proactively manage these multiple challenges and capitalize on rising demand, mining companies must innovate and lower operating costs to remain both profitable and viable. 

Why the urgent need for innovation?

Leading mining companies have shown that lower operating expense (OpEx) is a pre-requisite to on-going business success. This need is driven by the cyclical mining market and ever present,, hefty capital requirements, both of which are inherent in the mining industry. And, when demand is high, the OpEx cost component of unplanned downtime grows steeper. Data indicates that, in mining operations, the root cause of OpEx overages lies in maintenance issues that impede operating efficiencies and incur unnecessary costs. Left unaddressed, these gaps will prevent mining companies from fully capitalizing on increasing demand. 

According to McKinsey, mining companies have historically struggled with significant productivity declines, as shown below. In recent years, there is evidence that a slow recovery is underway, however, full resolution is in its’ infancy, primarily rooted in maintenance cost optimization.

Mining Productivity Index

Other data points on current mining operations underscore the urgent call for innovation and change:

  • 70%  operating efficiency due to breakdowns and stalled production, which translates to real potential for increased productivity and throughput
  • 30-50% of mining operations costs spent on maintaining plant, fleet and equipment, so, the magnitude of potential improvements on bottom-line profitability is significant
  • 3-5X cost for urgent repairs and corrective work requests versus planned maintenance, often made evident by tracking the percentage of work orders managed through the planning office.

While change is always difficult, the promise of technology (and Industry 4.0, Mining 4.0) is a welcome and required one for mining companies.  Digital technologies and automation, or Mining 4.0, is defined by smart equipment, drive data-driven (and thus better) decisions, catalyze connected communications and provide easier, more affordable maintenance. From there, mining companies will be able to speed up production, reduce downtime and boost employee safety – three pillars that have challenged mining operations for years.

The first step: Predictive maintenance via condition monitoring

As the first step to regain operational optimization and lower costs, mining companies must get “ahead of the curve” and prevent process interruptions and unplanned downtime. The key is predictive maintenance via condition monitoring systems.  By proactively assessing equipment health, mining operators can be alerted to developing failures before they occur and schedule planned repairs at the lowest possible cost and with minimal impact to production.

Condition monitoring systems are based on the principal that failure is a process, not an event. By monitoring asset characteristics, latent anomalies become apparent well before full failure, allowing for low-cost interventions, root-cause analysis and proactive planning for resolution, thereby mitigating process interruptions. Concurrent with deployment of well-engineered predictive maintenance strategy, a thorough rationalization review can minimize unnecessary or redundant maintenance tasks and, in many cases, eliminate human-induced failure modes.

Maintenance optimization is a powerful lever – and the first step -- to achieving and sustaining lower production costs in mining.

When 14% equals $8 million

Consider this PwC mining example, where predictive maintenance enabled a 14% reduction in maintenance spend by mitigating unplanned downtime to deliver US $8 million savings in operating expense (OpEx).

Goal: Reduce unplanned downtime

Solution: Condition monitoring system on critical equipment

Process:

  1. Condition monitoring insights provide operator alerts of potential failures.
  2. Proactive scheduling of repairs moves resolution to occur during planned maintenance, partial outage periods or normal equipment rotations.
  3. Asset availability and reliability increases, production interruptions are minimized and maintenance costs are reduced.

Result: 14% reduction in maintenance spend generates US $8 million in OpEx

PwC
Source: PwC “Balancing Uptime and Working Capital: Maintenance and Inventory Strategies in Mining”

Reliability and employee safety

The example above illustrates the dramatic improvements to operating expense as mining operators move from reactive / unplanned to proactive / planned maintenance. With decreased downtime, overall operational reliability also improves and with it, a metric of paramount importance in mining: employee safety.

Studies indicate that more reliable operations are safer operations. That’s because technology serves to reduce human-to-machine interaction and urgent, reactive work declines.  For one industrial company, as shown in the graph below, an OEE (Overall Equipment Effectiveness) improvement of 52% delivered a safety improvement of 69% during a 10-year period. 

Reliability

 

Customer Case Study: Slurry pumps

Let’s look at specific mining applications ripe for optimization and maintenance cost savings.  The first is slurry pumps. In mining pumping stations, pump failures are responsible for 97% of unplanned maintenance costs. Pump reliability, however, is crucial in the areas of safety, environmental impact, and efficient transportation.

Key characteristics of slurry pumps can be monitored so that timely analysis of impending issues enable early detection of issues at inception and prior to failure. This avoids unplanned maintenance, unplanned downtime, and averts lost revenue.

In slurry pump applications, dynamic pressure sensors can be used to detect reciprocating diaphragm failures, providing a novel diagnostic to increase pump reliability. The solution is based on these design principles:

  • The hydraulic fluid flexes the diaphragm
  • When the diaphragm flexes, slurry is discharged
  • Abrasive, corrosive slurries prohibit pressure sensor installations in slurry valves
  • Thus, dynamic pressure monitoring of the hydraulic fluid assesses the effectiveness of slurry discharge

The result?  A savings of US $3 million per year, based on maintenance cost recovery and capacity increases for a 10-pump station.

Customer Case Study:  Haul Trucks

In mining operations, haul trucks are another critical asset, as they are relied upon to move raw materials.  Alignment of extraction speed to transportation speed is required to keep operations flowing smoothly.  Mining operators have invested in larger, automated haul trucks to facilitate this timing alignment and optimize logistics. Thus, haul trucks and their operational health is a key enabler of production reliability in mining operations.

Monitoring haul truck health to ensure reliability, however, presents unique challenges.  Because haul trucks are in constant motion, data collection at precise and crucial times with linkage to a monitoring center and diagnostics requires innovative thinking and design.

For one mining company, a custom engineered solution for the haul truck’s control system was designed and installed.  The system was devised to monitor haul truck health in two distinct operating states so that changes in the various failure mode characteristics could be accurately identified:

  1. Running and loaded. In this state, vibration data is collected while the truck is running, loaded and in reverse mode (braking the truck using the electric motor of the electric wheels).
  2. Unloading. During unloading, vibration monitoring data is collected when the haul truck dump or bucket is being raised.

The result?  An estimated savings of US $5 million per year, based on an iron mine fleet of 30 trucks operating at 80% capacity. 

Outcomes like the examples above are possible for mining operations via innovative condition monitoring systems. There are many other condition monitoring mining applications, such as wireless sensors for hoist systems and continuous monitoring for SAG (semi-autogenous grinding) mills that deliver transformational outcomes.  The ultimate payoff for mining companies occurs when these applications and systems scale and interconnect into an operation-wide solution, enabling more holistic optimization.

Benefits of condition monitoring

Condition monitoring is part of Mining 4.0, the transformation driven by the adoption of automation and digital technologies. Mining 4.0 inherently supports the infrastructure and process requirements for condition monitoring systems. Specifically, Mining 4.0 will facilitate capabilities such as digitization, automation, analytics, artificial intelligence and machine learning, establishing a powerful foundation for predictive maintenance solutions and innovation.

Technology and predictive maintenance benefits have the potential to transform mining operations, starting with condition monitoring. In addition to managing and minimizing the impact of failures, mitigating downtime and reducing maintenance costs, condition monitoring systems also help to increase worker safety, reduce energy consumption and meet environmental requirements.

These benefits unleash significant potential for radical and positive changes in mining operations. All condition monitoring systems, however, vary in scope and effectiveness, so proper selection of a design and enablement provider with full-scale capabilities and proven expertise can impact outcomes significantly.

Innovation beyond technology

While innovation and transformation hold great potential, mining companies must go beyond reducing maintenance costs and implementing technology solutions. Companies must work differently and work smarter to capitalize on the full potential of digital technologies and holistic data strategies that deliver operation-wide benefits. For successful adoption, overcoming internal organizational barriers and cultural challenges to digital adoption is equally essential.  

To reduce pressure on capital-intense mining operations, condition monitoring solutions can be “self-funding” initiatives on the journey toward Mining 4.0 as operational benefits of condition monitoring are realized progressively from the early stages of implementation.

The way forward for mining companies is clear -- and full of promise. As the world increasingly relies on mining to produce the minerals needed for green energy, innovative mining leaders will usher in an era of profound global transformation that ultimately benefits us all.

To learn more about condition monitoring systems in mining operations, please reach out to speak with one of us or another experienced professional at Baker Hughes.

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