Light and Heavy REEs: Value of Rare Earth Ores Depends on Total REEs, the Mix, and Concentrations: Graphic from Alba Mineral Resources

      I caught a LinkedIn post from Mineral Alba Resources that describes how the value of rare earth deposits depends on the composition of the ore, whether the ore is made up of mainly light REEs or mainly heavy REEs, the mix, and the concentration of each.

     According to Alba Mineral Resources:

“Light rare earth elements (LREEs) and heavy rare earth elements (HREEs) differ in how they occur in nature, how they concentrate into different minerals, and what they are used for. Minerals such as bastnäsite and monazite are typically LREE rich (for example cerium, lanthanum, neodymium, praseodymium), while xenotime and related phases can concentrate HREEs such as dysprosium, terbium and yttrium.”

“This matters because a deposit’s potential value, processing route, and end use relevance depend heavily on its LREE vs HREE profile. It is not just about total REE. It is about which end of the spectrum dominates, because that influences everything from mineralogy and metallurgy to market applications.”

     LREE ores include Bastnasite and Monazite. HREE ores include Xenotime. Below, they explain some important uses of LREEs and HREEs and why LREE vs. HREE distributions can be used to help understand the geology of emplacement as well as later changes that may have affected concentrations.

“A simple example: neodymium (LREE) is a key ingredient in permanent magnets used in EV motors and wind turbines, while dysprosium (HREE) helps those magnets keep performance at higher temperatures. So the proportion and distribution of LREEs vs HREEs can change the story of a project.”

“From an exploration perspective, this split is also a geological clue. Variations in LREE and HREE distribution can help the team interpret how the system formed and whether later stage fluids may have modified or enriched certain zones. In short, the light vs heavy distinction is a core part of responsible rare earth exploration, because it keeps interpretation grounded in mineralogy, process, and context.”

     The first graphic below is from Alba Mineral Resources, and the second one of the periodic table is from Geology.com.

    

References:

 

Light vs. Heavy Rare Earth. Why It matters. Alba Mineral Resources PLC. (24) Alba Mineral Resources PLC: Posts | LinkedIn

REE - Rare Earth Elements and their Uses: The demand for rare earth elements has grown rapidly, but their occurrence in minable deposits is limited. Hobart M. King, PhD. Geology.com. REE - Rare Earth Elements - Metals, Minerals, Mining, Uses