Tag Archives: battery power

Gold Fields to trial Caterpillar dual-fuel solution on haul trucks at Tarkwa mine

Gold Fields plans to test the use of LNG to power haul trucks in a trial at its Tarkwa open-pit gold mine in Ghana, CEO Nick Holland told attendees of the IMARC Online event this week.

Speaking on a panel reviewing progress of the Innovation for Cleaner, Safer Vehicles (ICSV) initiative – a supply chain collaboration between the International Council on Mining and Metals (ICMM) and original equipment manufacturers (OEMs) – Holland said the trial would involve a mix of LNG and diesel fuel at the operation, and four trucks would initially be tested with the fuel combination in 2021.

Gold Fields later confirmed to IM that the trial would take place in the second half of 2021 and involve the use of Caterpillar’s dual-fuel LNG Dynamic Gas Blending (DGB) retrofit system on four of the mine’s Cat 785C 146 t payload dump trucks.

The DGB conversion kits, available on Cat 785C and 793D haul trucks, are a dual-fuel technology that enables miners to substitute diesel fuel with LNG, according to Cat. The use of LNG has been proven to reduce emissions by up to 30%, as well as lower costs by up to 30%, Cat says.

DGB vaporises liquid fuel into natural gas, then replaces diesel fuel with LNG when possible. On average, DGB replaces about 60-65% of diesel with LNG, according to Cat.

Tarkwa, which is 90% owned by Gold Fields, produced 519,000 oz of gold in 2019, 1% lower than the 525,000 oz produced in 2018. It employs Engineers & Planners Co Ltd as mining contractor.

While this trial will potentially lower the company’s carbon emissions – as will Gold Fields’ plan to fit “diesel filters” on all its machines underground in the next 12-18 months – Holland pointed to a much loftier long-term goal during the ICSV panel.

“The challenge to our teams and OEMs is to move away from diesel completely,” he said.

Such a move could see the company employ both battery-powered and hydrogen-powered solutions at its underground mines, he added.

Sandvik to add rock bolter to battery-powered mining line up

Sandvik Mining and Rock Technology plans to launch its first and one of the the mining industry’s first battery-powered rock bolters next year, as it continues to roll out new solutions to electrify the underground mining space.

The Sandvik DS412iE extends the zero emissions concept to the underground rock bolter class and opens a wide range of possibilities for mines driven to boost their productivity and safety with data-based analytics, according to the company.

In its core mission of delivering productive, secure and versatile rock support solutions, Sandvik rock bolters have a clear track record, according to the company.

“Still, these tools’ automation and data acquisition capabilities have not been as advanced as their production and development drill rig counterparts,” the company said. “Scheduled for launch during 2021, the new Sandvik DS412iE rock bolter will complement the intelligent family of next-generation battery-powered underground drill rigs.”

Anssi Kouhia, Product Manager, Rock Support Drills, said the DS412iE is basically an upgrade on its existing Sandvik DS411.

“We have received positive feedback about that model,” Kouhia said. “We made an accomplished model even better with more advanced automation capabilities, improved data acquisition and upgraded ergonomics.”

Like the battery-powered DD422iE  jumbo drill, the rig trams on battery and carries out drilling and bolting when connected to the mains power.

Along with its direct predecessor, the new intelligent bolter also has much in common with the larger Sandvik DS512i in the 5 x 5 m drift size. One example is their similar versatility in terms of bolting systems: Sandvik DS512i and Sandvik DS412iE can handle a wide range of bolt types and lengths, including a combination of automatic cement mixer and automatic resin injection on the same bolter.

The new Sandvik DS412iE will effectively complete Sandvik Mining and Rock Technology’s rock support drill range for the 4 x 4 m class, updating its entire product range to the latest i-standard of connectivity and automation capabilities, the company said. Additionally, the Sandvik DS412iE will be the supplier’s first battery-powered rock bolter.

“In other words, the zero underground emissions approach will now include all stages of the underground mining process: rock support drilling as well as development and production drilling and loading and hauling,” Sandvik said. “The ability to virtually eliminate underground particulate matter, NOx, CO2 and heat emissions is first and foremost a major health and safety benefit, but also offers cost savings by reducing mine ventilation power requirements.”

The new rig responds to major industry trends that customers have identified in feedback sessions, Sandvik said.

In addition to reducing underground emissions and improving working conditions, the safety and environmental improvements also make economic sense by reducing time lost to injuries and costs. The advanced automation capabilities will increase the speed and safety of the bolting cycles as well as open a range of possibilities for process optimisation, the OEM said. “This will translate into more reliable rock supporting and safer working environments.”

Like one-hole automation that has been a standard feature in Sandvik mining and tunnelling jumbos, the one-bolt automation feature of Sandvik DS412iE now extends this capability to rock bolters, Sandvik said.

“The rig can carry out a single bolting cycle unassisted, so that in optimal conditions the operator only needs to manually relocate the boom from one bolt location to another,” the company said.

The battery-powered unit will come with two automation levels: the standard Silver package from the outset and, in the near future, the optional extended Gold level. The main difference between the two packages is in the remote monitoring and operating capabilities and in the measurement-while-drilling functionality.

The automation packages seamlessly mesh with Sandvik iSure software, according to the company. Available as a standard tool for designing drift drilling plans and blasting plans, iSure now increasingly extends to bolting operations and comes in three levels: iSure Basic and iSure Plus for the standard Silver automation package, and iSure Premium for the optional Gold level automation. The advanced automation solutions can offer a significant productivity and quality boost, Sandvik said.

“With iSure, you can design a bolting pattern in the office, transfer it to the rig over Wi-Fi or on a USB flash drive, carry out the bolting according to the pattern, and, on top of that, you can retrieve a report that compares the plan and the realised bolting pattern,” Kouhia says.

iSure compatibility, in particular, enables more extensive data acquisition and reporting, Sandvik said.

In addition to the bolting pattern, the retrieved data will also include various parameters that characterise the quality of the bolting process, such as grouting concrete consumption and bolt tightening torques. This can serve to document the bolting process in much greater detail than it did previously, which enables more accurate quality control of the rock supporting measures.

The verifiable track record of the rock support measures taken provides systematic safety documentation and, should a failure still occur, the bolting process reports can help to determine the cause of it, down to the level of an individual bolt – when it was installed, how it was installed and whether it complied with set specifications.

Full compatibility with the My Sandvik fleet management portal and the OptiMine suite of digital mine automation and analytics solutions further enhances the connectivity of Sandvik DS412iE, providing all-round data-based control for rock support operations, the company said.

While the main areas of focus for Sandvik DS412iE surround automation, connectivity and data acquisition capabilities, productivity has not been neglected, Sandvik said.

The new boom control system, advanced boom manipulator mode and optimised bolting head movements help the operator to achieve a smooth and efficient process by keeping the bolting head automatically aligned with the correct bolt fan positions and angles, the company explained.

In terms of sheer mechanical power, much of the new bolter’s high productivity derives from the new control system of the Sandvik RD314 rock drill, which substantially increases the output and penetration rate. Overall, the productivity upgrade is roughly 25% from previous models, according to Sandvik.

The Sandvik DS412iE includes many safety and ergonomic features.

The bolter is designed to be compliant with the EN16228 standard for drilling and foundation equipment, which is harmonised with the requirements of the European Machinery Directive. One of the EN16228 requirements is an access detection system (ADS). In the Sandvik DS412iE, the ADS automatically scans the surroundings of the bolter and alerts the operator should a person enter the work area, which effectively reduces potential accidents. The safety improvements also include a fully covered steel strand reel.

The Sandvik DS412iE continues the bolter class’ legacy of secure and effective cabin design, Sandvik says, with a 55% percent improvement in visibility, better effective vibration control and significant noise reduction adding up to a safer and more comfortable workplace for the operator.

Future launches will also include a diesel-powered version, Sandvik DS412i, which will be compliant with the latest engine emission specifications, Sanvik said.

This is an edited version of a story that first appeared on Sandvik’s Solid Ground platform here.

Nevada Gold Mines adds natural gas to power remit, mulls solar options

Nevada Gold Mines (NGM) says it has approved the conversion of its TS Coal Power Plant to a dual fuel process, allowing the facility to generate power from natural gas.

This conversion, which will enable the facility to reduce carbon emissions by as much as 50%, is in support of Nevada’s carbon-reduction objectives and is in partnership with Governor Sisolak’s administration, NGM said.

NGM is currently working with the State of Nevada on final permitting to allow construction to begin near the end of 2020, with the goal of final commissioning in the June quarter of 2022.

As part of its overall energy management strategy, NGM is also reviewing the potential for a 200 MW solar facility with battery storage. The intention is to phase construction, initially installing 100 MW that could produce power as early as 2022. A study is currently underway and, once the project is approved, NGM will work with the State of Nevada and the Office of Energy on permitting, it said.

Greg Walker, Executive Managing Director, NGM, said: “Nevada Gold Mines is committed to providing its operations low cost, secure power generation through northeastern Nevada’s power grid now and into the future. The conversion of NGM’s TS Power Plant and the potential for an additional solar power facility illustrates this commitment while reducing the State’s carbon emissions.”

NGM has two power generation facilities in northern Nevada with the TS Power Plant in Dunphy and the Western 102 Power Plant outside of Reno. The TS Power Plant commenced operation in 2008 and has a capacity of 215 MW power generation from its original coal-fired process. The Western 102 Power Plant has a capacity of 115 MW, supplying power from natural gas fired generators and a 1 MW Solar Facility, according to NGM.