Rare Earth Elements (REE) are used in many low carbon technologies, ranging from low energy lighting to permanent magnets in large wind turbines and hybrid cars. They are almost ubiquitous: in every smartphone and computer. Yet 97% of World supply comes from a few localities in China. Rare earth prices are volatile and subject to political control, and but substitute materials are difficult to design. The most problematic REEs to source are neodymium and the higher atomic number 'heavy' rare earths - a group dubbed the 'critical rare earths'. However, with many potential rare earth ore deposits in a wide variety of rocks, there is no underlying reason why rare earths should not be readily and relatively cheaply available. The challenge is to find and extract rare earths from the right locations in the most environmentally friendly, cost efficient manner to give a secure, reasonably priced, responsibly sourced supply. In this project, the UK's geological research experts in rare earth ore deposits team up with leaders in (a) geological fluid compositions and modelling, (b) using fundamental physics and chemistry of minerals to model processes from first principles and (c) materials engineering expertise in extractive metallurgy. This community brings expertise in carbonatites and alkaline rocks, some of the Earth's most extreme rock compositions, which comprise the majority of active exploration projects. The UK has a wealth of experience of study of economic deposits of rare earths (including the World's largest deposit at Bayan Obo in China) which will be harnessed. The team identify that a key issue is to understand the conditions that concentrate heavy rare earths but create deposits free from thorium and uranium that create radioactive tailings. Results so far from alkaline rocks and carbonatites are contradictory. A workshop will bring together the project team and partners, including a leading Canadian researcher on rare earth mobility, to debate the results and design experiments and modelling that can be done in the UK to solve this problem. Understanding, and then emulating how REE deposits form, may provide us with the best clues to extract REEs from their ores. One important route is to understand the clay-rich deposits in China which provide most of the World's heavy rare earths; they are simple to mine, not radioactive, and need little energy to process. The workshop will consider how these deposits form, how we can use our experimental and modelling expertise to understand them better and predict where companies should explore for them. The other main problem, restricting development of almost all rare earth projects, is the difficulty of efficient separation of rare earth ore minerals from each other and then extraction of the elements from those ores. A work shop on geometallurgy (linking geology through mining, processing, extractive metallurgy and behaviour in the environment) will be used to explore how geological knowledge can be used (a) to predict the processing and environmental characteristics of different types of ores and (b) to see if any new potential processing methods might be tried, taking advantage of fundamental mineralogical properties. The two workshops link geology to metallurgy, using one to inform the other. This project will form the basis for an international collaborative consortium bid to NERC. It will also catalyse a long-term UK multidisciplinary network linking rare earth researchers to users, and promote the profile of the UK in this world-wide important field. Before the team design the research programme, they will consult academic colleagues working on new applications of rare earths and rare earth recycling, plus exploration companies, users further along the up the supply chain and policy makers. This will ensure that the proposals developed have maximum impact on future supply chain security.

Along with many other countries worldwide, the UK is committed to achieving a low carbon economy. There is a plan to achieve net zero carbon dioxide emissions by 2050, with a key component of this plan being a ban on the sale of new petrol and diesel cars by 2035, and a switch to electric vehicles. These vehicles will require storage batteries that contain many components made of metals that have limited supplies. For example, a recent open letter authored by Professor Richard Herrington (principal investigator for the NHM on this proposal) explained that if the UK is to meet its electric car targets, it will require three quarters of the world's current total annual production of lithium - an essential component of modern electric vehicle batteries. Whilst current rates of lithium production are sufficient to meet global demand, we need to investigate additional lithium resources if we are to meet greenhouse gas emission targets. This proposal seeks to better understand the Earth system processes that concentrate lithium into mineral deposits, from which lithium can be mined in both an economically feasible and an environmentally responsible manner. Our central hypothesis is that major lithium deposits are largely formed in parts of the world where continental collision occurs as a consequence of plate tectonics. We will further test the hypothesis that within these collisional environments there is a "life-cycle" of tectonic processes that is reflected in the formation of different types of lithium deposits. Broadly speaking, in the first stage lithium is moderately concentrated in igneous rocks that are formed in this setting. Lithium is a relatively soluble element, which is readily leached and weathered from these rocks (particularly by hot geothermal water) and the lithium-rich waters may accumulate in basins that are also formed during continental collision. If the climate is arid, the waters evaporate to form a lithium-rich brine that can be an economically viable lithium deposit in its own right. In these brine basins, complex chemical processes and extreme microbial life may play a role in cycling elements and concentrating the lithium into sediments. Over time, the geothermal and volcanic activity ceases and the lithium-rich sediments may be buried and thus preserved for millions of years. Subsequently, these buried rocks may also serve as a source of lithium that can be extracted. With further burial and then heating, these lithium-rich sediments can reach temperatures at which they undergo melting and the formation of lithium-enriched pegmatites and granites. Again, these rocks may contain sufficient concentrations and amounts of lithium to represent a source of lithium that can be extracted for ultimate incorporation in electric vehicle batteries. At each stage of the life-cycle there are uncertainties regarding the source of lithium, and how it is transported and trapped. The different types of lithium deposits also vary in how easy it is to extract the lithium, and we need to consider how to do this in an environmentally responsible way. We will tackle these problems by bringing together a group of scientists who have considerable expertise in all aspects of this lithium journey. We will use a wide range of techniques, from simple geological observations through to highly sophisticated isotopic analyses and microbiological techniques, to track the behaviour of lithium. We will work alongside industry partners to identify the types of deposits that can be profitably extracted while simultaneously minimising any damage to the environment, and we will investigate the potential for more sustainable methods of lithium extraction using microbial processes. We anticipate that our research will provide industry with new targets for exploration for lithium resources. This will not only help secure a low carbon economy for the UK, but also provide important economic benefits to the UK and other nations.

The Circular Economy (CE) is a revolutionary alternative to a traditional linear, make-use-dispose economy. It is based on the central principle of maintaining continuous flows of resources at their highest value for the longest period and then recovering, cascading and regenerating products and materials at the end of each life cycle. Metals are ideal flows for a circular economy. With careful stewardship and good technology, metals mined from the Earth can be reused indefinitely. Technology metals (techmetals) are an essential, distinct, subset of specialist metals. Although they are used in much smaller quantities than industrial metals such as iron and aluminium, each techmetal has its own specific and special properties that give it essential functions in devices ranging from smart phones, batteries, wind turbines and solar cells to electric vehicles. Techmetals are thus essential enablers of a future circular, low carbon economy and demand for many is increasing rapidly. E.g., to meet the UK's 2050 ambition for offshore wind turbines will require 10 years' worth of global neodymium production. To replace all UK-based vehicles with electric vehicles would require 200% of cobalt and 75% of lithium currently produced globally each year. The UK is 100% reliant on imports of techmetals including from countries that represent geopolitical risks. Some techmetals are therefore called Critical Raw Materials (high economic importance and high risk of supply disruption). Only four of the 27 raw materials considered critical by the EU have an end-of-life recycling input rate higher than 10%. Our UKRI TechMet CE Centre brings together for the first time world-leading researchers to maximise opportunities around the provision of techmetals from primary and secondary sources, and lead materials stewardship, creating a National Techmetals Circular Economy Roadmap to accelerate us towards a circular economy. This will help the UK meet its Industrial Strategy Clean Growth agenda and its ambitious UK 2050 climate change targets with secure and environmentally-acceptable supplies of techmetals. There are many challenges to a future techmetal circular economy. With growing demand, new mining is needed and we must keep the environmental footprint of this primary production as low as possible. Materials stewardship of techmetals is difficult because their fate is often difficult to track. Most arrive in the UK 'hidden' in complex products from which they are difficult to recover. Collection is inefficient, consumers may not feel incentivised to recycle, and policy and legislative initiatives such as Extended Producer Responsibility focus on large volume metals rather than small quantity techmetals. There is a lack of end-to-end visibility and connection between different parts of techmetal value chains. The TechMet consortium brings together the Universities of Exeter, Birmingham, Leicester, Manchester and the British Geological Survey who are already working on how to improve the raw materials cycle, manufacture goods to be re-used and recycled, recycle complex goods such as batteries and use and re-use equipment for as long as possible before it needs recycling. One of our first tasks is to track the current flows of techmetals through the UK economy, which although fundamental, is poorly known. The Centre will conduct new interdisciplinary research on interventions to improve each stage in the cycle and join up the value chain - raw materials can be newly mined and recycled, and manufacturing technology can be linked directly to re-use and recycling. The environmental footprint of our techmetals will be evaluated. Business, regulatory and social experts will recommend how the UK can best put all these stages together to make a new techmetals circular economy and produce a strategy for its implementation.