Didipio Archives - International Mining

With a Vancouver-based headquarters and operational mines in the Philippines, the US and New Zealand, access to – and sharing of – data for decision making is critical for the optimisation of OceanaGold’s various operations and processes. It is also proving equally important for the company’s pursuit of recruitment and upskilling.

OceanaGold’s vision is to be a company people trust, want to work and partner with, supply and invest in, to create value. This vision comes alongside a plan to grow its gold production from 460,000-480,000 oz, to 580,000-600,000 oz in 2025, all while lowering its all-in sustaining costs.

Data is playing an increasingly important role in achieving this vision, with the company having invested heavily in digital and networking technology in the last few years.

For example, the company has made investments in industrial Wi-Fi across its operations – at the Golden Point underground mine (part of the Macraes operaton in New Zealand), Didipio (Philippines) and Haile (USA) – to improve access to data and company systems.

Michelle Du Plessis, Chief People & Technology Officer, told IM: “This investment is improving operational efficiency by reducing the need for people to leave operational areas of the mine to access data and systems.

“This also enables more of our equipment to be operated more safely and remotely.”

And remote operation of equipment has been growing with the installation of these network backbones, with teleremote underground drilling, loading and hauling in place at Golden Point with Sandvik fleets, plus teleremote loading and hauling – with Sandvik AutoMine®-equipped LH517is and TH551is – occurring at Haile.

There are also plans to switch to teleremote operations from a surface cabin at the Didipio underground mine.

The company is completing the real-time data process loop, with tablet-based mine operation control software – Digital Terrain’s Simbio solution – being implemented at all of its underground operations to, Du Plessis says, more accurately and effectively control underground mine planning based on what is happening in the mine at that time.

At the Horseshoe underground mine at Haile, the newest underground mine within the group, the company is also using digital and data platforms for its mine planning and short interval control systems, with the API-enabled integration coming into the Snowflake cloud-based ecosystem.

Du Plessis says these platforms are fully integrated with shift plans uploaded onto tablets and updated digitally if plans change through the shift.

On surface at the Macraes open-pit operation in New Zealand, the company is also working on the effective digital transfer of data, having recently migrated away from an older version of the Cat® MineStar™ Fleet FMS to MineSense for Miners’ (MS4M) FMS. “The main benefits were more accurate management of the fleet in terms of efficiency and maintenance planning,” Du Plessis explained of this change.

*On surface at the Macraes open-pit operation in New Zealand, OceanaGold is now using MineSense for Miners’ (MS4M) FMS*

Data access and availability is having a positive impact on operational productivity at OceanaGold’s operations, as well as enabling the company to confront the skills shortage it and every mining company is facing at the moment.

Du Plessis said: “At OceanaGold, we are taking a systematic and multi-pronged approach to skills development across the talent lifecycle. This guides the way we prepare our workforce for the future opportunities by building the data and technology capabilities across the company.

“We also have a distributed operational footprint, which allows us to draw on, and foster, talent in multiple jurisdictions and we can take advantage of workforce mobility between the operations.”

Some of the company’s operations are in regions where mining is not the major employer, and there are plenty of people with skills but no mining-specific experience. With OceanaGold prioritising a residential workforce and local employment over fly-in, fly-out options, skills development is crucial for resourcing its operations.

“To help us develop these skills and provide people an opportunity to build a career and have sustainable employment in mining, we partner with experienced training providers and contract mining companies,” Du Plessis explained.

For example, in the Philippines, OceanaGold has partnered with Site WorkReady (Philippines) Pty Ltd to use the Site Skills Training Center in Clark Pampanga. This facility allows the company to train new employees to work in an underground mining environment, with a focus on safety. “We are also looking at the opportunity to extend this partnership to include additional skills, such as automotive and heavy diesel mechanics, to continue to upskill our local workforce,” Du Plessis said.

In South Carolina, where the company has recently commenced mining from the new Horseshoe underground mine, OceanaGold has engaged Redpath Mining Inc in a similar skills development role.

“In addition to their mining contract, Redpath provide training and resources to develop the underground mining skills of the local workforce, allowing us to transition to a full owner-operator model over time,” Du Plessis explained.

The company has also invested in an underground training simulator at the operation, offering potential recruits exposure to the underground environment and building the operating skills of new trainees.

The installation of 19 Cavex® 400CVX10 hydrocyclones at OceanaGold’s Didipio gold and copper mine in the Philippines has led to savings of more than $800,000/y through a dramatic reduction in grinding circuit recirculation, according to Weir Minerals.

The Didipio mine, which employs more than 1,500 workers (drawn predominantly from the local community), has expanded throughput over the last few years in line with its transition from open pit to underground mining. This increased the incumbent cyclones’ feed density beyond what they could effectively manage, leading to a circulating load of up to 700%, according to Weir.

The Cavex 400CVX10 hydrocyclones significantly improved separation efficiency due to their finely tuned spigot liner diameter and the strength and corrosion resistance provided by its cast housing, according to Weir.

Thanks to these qualities, the introduction of the Cavex hydrocyclones reduced the circulating load from 620% to 374%, with the direct savings in power consumption, ball consumption, cyclone and pump maintenance costs exceeding $815,000/y.

Gary Webb, Processing Manager, OceanaGold Didipio project, said: “Having had good performance from Cavex hydrocyclones at our New Zealand sites (Macraes and Waihi), we were confident that retrofitting Cavex hydrocyclone cluster at Didipio, with an increased number of smaller cyclones than we had at the time, would help reduce our problematic circulating load and lever multiple benefits in doing so.

“The changeover to Cavex hydrocyclones has exceeded our expectations, enabling higher throughput and lower consumable costs without being penalised in grind size.”

The performance of Cavex hydrocyclones can be attributed to the 360° laminar spiral inlet geometry design, which provides a natural flow path into the hydrocyclone, Weir said. This shape allows the feed to blend smoothly with rotating slurry inside the chamber, reducing turbulence.

Mike Arakawa, Philippines Country Manager, Weir Minerals, said: “Working with customers across the globe, our expert engineers are constantly looking at how they can maximise separation efficiency, hydraulic capacity and extend the wear life of not just the hydrocyclone, but our customers’ overall processing plants.

“I’m proud of the results we’ve achieved together with OceanaGold. Reduced circulation means reduced power draw, fewer balls consumed and less equipment wear, creating a more sustainable mine.”

Didipio produced 114,985 oz of gold and 14,999 t of copper in 2018, with 120,000-130,000 oz and 14,000-15,000 t of copper slated for 2019.

OceanaGold on the benefits of data-driven transformation

Weir Cavex hydrocyclones take a load off at OceanaGold Didipio mine