Page 40 of 863      News per page:1020

09.07.2021 (2303 Clicks)

Oxford Scientists show how Green Mining could pave the Way to net zero and provide the Metals we need for a sustainable Future

Scientists at the University of Oxford demonstrate how it is possible to directly extract valuable metals from hot salty fluids (‘brines’) trapped in porous rocks at depths of around 2km below dormant volcanoes.

They propose this radical green-mining approach to provide essential metals for a net zero future – copper, gold, zinc, silver and lithium – in a sustainable way.

Magma beneath volcanoes releases gases that rise towards the surface. These gases are rich in metals. As the pressure drops, the gases separate into steam and brine. Most metals dissolved in the original magmatic gas become concentrated in the dense brine, which in turn gets trapped in porous rock. The less dense, and metal-depleted steam continues up to the surface, where it can form fumaroles, such as those seen at many active volcanoes (see attached photo).

In a new paper, published today in Open Science, Oxford scientists, based at the Department of Earth Sciences, reveal how this trapped, subterranean brine is a potential 'liquid ore' containing a slew of valuable metals, including gold, copper and lithium, that could be exploited by extracting the fluids to the surface via deep wells.

Their models show that the brines potentially contain several million tonnes of copper. Copper is a key metal for making the transition to net zero, due to its importance in electricity generation and transmission, and electric vehicles.

Professor Jon Blundy, based at the Department of Earth Sciences and lead author, said: ‘Getting to net zero will place unprecedented demand on natural metal resources, demand that recycling alone cannot meet. We need to be thinking of low-energy, sustainable ways to extract metals from the ground. Volcanoes are an obvious and ubiquitous target.’

The paper also shows how geothermal power will be a significant by-product of a green-mining approach, meaning that operations at the well-head will be carbon-neutral.

Conventional mining extracts metals, such as copper, from deep pits or underground mines in the form of solid ores that then need to be crushed and processed. In the case of copper over 99% of the crushed rock is waste. Such mines are environmentally impactful, very expensive to construct and decommission, produce huge tailings piles of waste rock, and are very energy-demanding and CO2-producing.

The prospect of extracting metals in solution form from wells reduces the cost of mining and ore processing, plus exploits geothermal power to drive operations. This vastly reduces environmental impact of metal production.

Professor Jon Blundy, said: ‘Active volcanoes around the world discharge to the atmosphere prodigious quantities of valuable metals. Some of this metal endowment does not reach the surface, but becomes trapped as fluids in hot rocks at around 2 km depth. Green mining represents a novel way to extract both the metal-bearing fluids and geothermal power, in a way that dramatically reduces the environmental impact of conventional mining.’

The research is part of an international effort (between the UK and Russia) that uses volcanology, hydrodynamic modelling, geochemistry, geophysics and high temperature experiments.

The team has worked on drill core from a number of deep geothermal systems (in Japan, Italy, Montserrat, Indonesia, Mexico) to confirm their predictions of metal-rich brines.

Professor Jon Blundy, who is now funded by a research professorship from the Royal Society to work on volcanoes and green mining, said: ‘Green mining is a scientific and engineering challenge which we hope that scientists and governments alike will embrace in the drive to net zero.’

The scientists say that geophysical surveys of volcanoes show that almost every active and dormant volcano hosts a potentially exploitable 'lens' of metal-rich brine. This means that metal exploration may not be limited to relatively few countries as it is currently (Chile, USA, Peru, China, DRC etc), owing to the ubiquity of volcanoes around the world.

The principal risks are technological. The process involves drilling into rock at 2 km depth and at temperatures of more than 450 °C. The extracted fluids are corrosive, which places limits on the types of drilling materials. The extracted fluids tend to dump their metal load in the well-bore, a problem known as 'scaling' (a bit like limescale in a kettle). Preventing scale formation will require complex thinking about the dynamics of fluid flow and pressure-temperature control in the well-bore. Preventing well-bore corrosion will require developments in materials science to create resistive coatings.

According to the Oxford team, many of these challenges are already being addressed through deep, hot geothermal drilling projects. In some cases these projects have reached temperatures over 500 °C; occasionally they have tapped into small pockets of molten rock, for example in Iceland and Hawaii.

Ensuring the fluids continue to flow into the well once drilled is a complex problem and the permeability and porosity of hot, ductile rock is a challenging field. The Oxford team has already patented an idea for fluid extraction.

They say that the risk of triggering volcanic eruptions is very small, but must be assessed. They are not planning to drill into magma itself, but into the hot rocks above the magma chamber, which greatly reduces the risk of encountering magma

The scientists have spent the last five years 'de-risking' the concept, and are now ready to drill an exploratory well at a dormant volcano. This will clarify many of the risks and challenges described, and will herald a new advance in our understanding of volcanoes and their immense bounty of energy and metals.

Professor Jon Blundy, said: ‘Continuing the de-risking work, which we are pursuing on many fronts through an international collaboration, is important. Likewise, we need to identify the best test-case volcano to drill an exploration well.’

They say a working 'brine mine' could be 5-15 years away, depending on how well the challenges can be addressed.

Source: University of Oxford

                     

09.07.2021 (539 Clicks)

Implenia wins large Tunnelling Project in France: Lot 3 of the Lyon-Turin Base Tunnel

TELT (Tunnel Euralpin Lyon Turin) awarded Lot 3 of the 57.5 km long Mont-Cenis base tunnel to a Joint Venture led by Implenia (34%). The total contract volume is CHF 248 million (EUR 228 million) and the project is in line with the company’s strategic focus on large, complex infrastructure projects.

08.07.2021 (470 Clicks)

Epiroc acquires Chilean Provider of intelligent Mining Solutions

Epiroc, a leading productivity and sustainability partner for the mining and infrastructure industries, has acquired Mining Tag S.A., a Chilean company that provides sensor-based solutions that strengthen safety and productivity in mines by making operations smarter.

06.07.2021 (486 Clicks)

Glencore: Kalidas Madhavpeddi will follow Tony Hayward as Chairman

The board of Glencore announces that Tony Hayward will retire as Chairman and Kalidas Madhavpeddi will be appointed as the new Chairman on 30 July.

06.07.2021 (443 Clicks)

Sustainable Construction Sites – Teco 2030 and Implenia receive public Funding for developing zero-emission Construction Site Solutions

Norwegian cleantech company Teco 2030 and Implenia Norway have been granted funding by Norwegian state enterprise Enova to jointly develop and pilot hydrogen-powered solutions that will eliminate emissions at construction sites. This is in line with Implenia’s ambitious sustainability goals.

06.07.2021 (562 Clicks)

Fugro’s Seawatch Wind Lidar Buoy Geo-data to support Vietnam’s renewable Energy Transition

Fugro and PTSC G&S, a lead provider of diversified technical services for energy and other industries in Vietnam and South-East Asia, have signed a contract with Enterprize Energy Group to supply, install and operate a Seawatch Wind Lidar Buoy at Vietnam’s Thang Long Offshore Wind Farm site. From July 2021, the device will record continuous measurements for an initial period of 1 year to support wind resource mapping.

06.07.2021 (481 Clicks)

Hochtief expands Prague Metro

Hochtief and its partners are to expand the Prague metro.

06.07.2021 (388 Clicks)

Three Consortia compete for green Transformer Station for the Fehmarnbelt Tunnel

Femern A/S has prequalified three consortia to compete for the contract to establish a large transformer station to supply the Fehmarnbelt tunnel and the railway between Denmark and Germany with green electricity. The transformer station will also have the capacity to power electric vehicles.

02.07.2021 (521 Clicks)

Metso Outotec and Hispano Japonesa de Maquinaria to expand Partnership in Spain

Metso Outotec and Hispano Japonesa de Maquinaria S.L. (HJM) have agreed on an expansion of their distribution contract in Spain. In addition to mobile equipment, with the new scope the cooperation also covers Metso Outotec’s stationary crushing and vibrating equipment, crusher wear parts and spare parts, as well as service contracts, commissioning, and technical support. The contract comes into effect in July 2021.

02.07.2021 (401 Clicks)

Acquisition: Rema Tip Top strengthens its Position in the Belgian Market

Rema Tip Top AG acquires the shares in MBS Group and BMC BV – Bulk Maintenance Construction from their previous owners Gert Moens and Pierre de Keyser. This makes Rema Tip Top one of the largest total suppliers of rubber and plastic conveyor belts, conveyor belt components, wear and corrosion resistant materials for wall coverings and industrial plastics in the Benelux countries.