In charge: the battery technologies leading the way in mining 

As electric vehicle technology becomes more widely adopted for mining vehicles, Jack Unwin explores the leading battery-powered mining vehicles on the market.

Image courtesy of Volvo

It is fair to say that electric vehicles (EV) have undergone a revolution in the last decade or so. Once a novelty, EVs are becoming increasingly prevalent, with governments such as the UK investing in electric buses, while electric taxis and cars have also become commonplace.

Battery-powered mining vehicles are an attractive proposition for more sustainable operations, as they produce less damaging emissions and vehicles save on fuel. They also produce a knock-on effect of reducing costsin areas such as ventilation and air conditioning, and in many cases perform their tasks much better than diesel trucks of the same standard.

However, as most of the new vehicles are powered by lithium-ion batteries, it may further spur the need to mine lithium. This in turn can lead to pollution of the soil and rivers where it is mined, leading to a circle of environmentally dangerous mining producing environmentally friendly batteries.

The future of mining vehicles may be battery powered, but diligence is needed on what type of battery will be used.

Caterpillar R1700XE

US construction machinery company Caterpillar unveiled the R1700XE in April 2019. Powered by lithium-ion batteries, the R1700XE has the MEC-500 on-board charging system for rapid charging that will allow for onboard charging of the batteries. The R1700XE has a number of benefits over the standard diesel models.

Caterpillar says that the R1700XE can reduce ventilation costs as it generates less heat and dust, sp extensive mine air conditioning systems could be reduced. As such, this would reduce the operating costs of a mine.

Through testing, Caterpillar found that compared to the diesel-powered R1300 model, the R1700XE's total energy costs decreased by ‘ten-fold’ and there was an ‘eight-fold’ decrease in generated heat. The XE was also less noisy and had reduced tire wear compared to the R1300.

Caterpillar currently has 350 patents for electric driving products such as the D6 XE crawler bulldozers and 988K XE wheel loader.

Image courtesy of Caterpillar

Epiroc Minetruck MT42 Battery

Swedish company Epiroc has unveiled a series of electric vehicles since 2016. In November 2018, it unveiled its second generation of electric vehicles for mining.

This includes the Minetruck MT42 Battery, the largest battery-operated mining truck on the market with a 42 tonne payload capacity. Like the R1700XE it uses lithium-ion batteries and it hauls material faster than its diesel-powered rivals, producing ‘unheard-of’ speed inclines.

The MT42 produces zero emissions as it does not emit toxic gases such as nitrogen oxide and carbon monoxide and also has fewer components, which leads to longer time between services subsequently lowering running costs.

Other electric vehicles in Epiroc’s fleet include the Scooptram EST1030, a loader with a ten tonne capacity and a top speed of 15 kilometres an hour. As it is 100% powered by electricity, the EST1030 consumes 70% less energy than similar diesel loaders.

Image courtesy of Epiroc

Volvo HX2 load carrier

Volvo has also unveiled a series of mining vehicle prototypes in recent years. Its HX2 load carrier, the upgrade from the HX1, offers a 50% improvement on fuel efficiency compared to its counterparts.

Volvo also has the LX1 prototype electric hybrid wheel loader. Having been tested for hundreds of hours, the LX1 has been found to provide a 50% improvement in fuel efficiency and a 35% reduction in greenhouse gas emissions.

Volvo is also working with companies such as Telia and Ericsson to develop a 5G network at its facility in Eskilstuna in order to support remotely controlled vehicles and autonomous operations.

The company has been testing these prototypes at the Skanska-owned Vikan Kross quarry near Gothenburg, Sweden. The site it underwent a ten week experiment to become the world’s first emission free quarry. In November 2018 it was reported that there was a 98% reduction in carbon emissions, 70% reduction in energy costs and 40% reduction in operating costs at Vikan Kross.

Image courtesy of Volvo

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