MINERÍA la mejor puerta de acceso al sector minero EDICIÓN 569 / FEBRERO 2025 22 Tierras raras Abstract Rare earth elements (REE) have become very important worldwide in recent years. REEs have been recognized as "strategic" raw materials for the development of new technologies. REE are a group of metals (from the lanthanides) and two other metals: scandium (Sc) and yttrium (Y). Since the 1990s, China has been the main producer and has the world's largest reserves. The Chinese government announced an export quota for REE in 2009, because it wanted to retain them for its own market. To this end, TIERRAS RARAS La – Lu, Sc E Y
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