Though they’ve been talked about for quite a few years, most of us have a rather vague notion of what strategic and critical rare metals and rare earths actually are. Some of these concepts relate to geology, while others have an economic dimension. This makes them difficult to consider like-for-like. Here are some key points(1) for each.
Definitions of strategic and critical rare metals
Rare metals are metals having a low average abundance and/or availability in the Earth’s crust (i.e. the capacity to concentrate in deposits). This is the case, for example, for indium, cobalt and antimony. Rare earths comprise a group of fifteen metals (the lanthanides) which form an integral part of the earth’s rare metals. They are commonly associated with yttrium and scandium. Their unique properties (lightness, strength, energy storage, thermal resistance, magnetic and optical properties, etc.) make them the elements of choice in a range of technology fields, ranging from defence to digital and energy transition sectors (e.g. permanent magnets, batteries, catalytic systems, etc.). Despite their name, the rare earths are not in fact that rare. However, their deposits – in other words, naturally-occurring concentrations that are economically exploitable – are typically not found in abundance(2).
A metal is strategic if it is essential to a State’s economic policy (security, defence, energy policy, etc.). A metal may also be considered strategic for a particular company or industry (e.g. aerospace, defence, automotive, electronics & ICT, renewable energies, nuclear, etc.).
A metal is deemed critical if difficulties with the metal’s supply could have negative industrial or economic impacts. In most international studies the criticality of a metal (as of any mineral) is judged on two criteria: supply-side risk (geological, technical, geographical, economic, geopolitical), and economic importance which reflects the vulnerability of the economy to potential shortage or supply interruption creating a surge in prices. According to Raphaël Danino-Perraud(3), “In short, critical metals are metals associated with supply chain pressures, in terms of both supply and demand.” For the US National Research Council and the European Commission, a metal or mineral is critical when it is “both essential in use and potentially subject to supply constraints.”
The most critical raw materials in Europe and France
In 2017 the EU revised its list of critical raw materials, which now includes 27 – nine more than in 2014, when the second revision was published (cf. COM (2017) 490, dated 13.09.2017). According to the BRGM (the French geological survey) the most critical materials in France in 2018 were tungsten, rare earths, antimony, platinoids, cobalt, scandium and rhenium. At the same time, the substances considered the most strategic were tungsten, certain rare earths (praseodymium, neodymium and dysprosium), cobalt, copper, chromium, nickel, molybdenum, titanium, lithium, tantalum, beryllium and certain platinoids (platinum, palladium and rhodium).
1) Our thanks to the BRGM for its invaluable assistance!
2) For this reason it is difficult to give a number of years of reserves of a particular material, particularly as uses can change radically (currently the case with digital technology, renewable energies and electric vehicles) and substitutes may be found.
3) Raphaël Danino-Perraud, “Faced with the challenge of critical metals, a strategic approach to recycling is essential”, IFRI, December 2018. Note: In a future article, we will return to look at the challenges posed by recycling and the development of industrial capabilities in this field.
4) Launched in January 2018, the two-year GENERATE project (concerning the Geopolitics of renewable energies and prospective analysis of the energy transition) is being led by Emmanuel Hache (IFPen) and Samuel Carcanague (IRIS). The analysis will address cobalt, platinum and certain rare earths, together with cement and water. Learn more at: https://anr.fr/Projet-ANR-17-CE05-0024