Rare earths
A group of 17 chemical elements: the 15 lanthanides, plus scandium and yttrium.
Occurrence
A record of mineral presence. It does not by itself equal a resource or reserve.
Favorability
A comparative reading of evidence used to prioritize areas for further investigation.
Investigation target
An area prioritized by a testable hypothesis. Geological and field validation are still required.
Mineral resource
A concentration with reasonable prospects for extraction, estimated and classified under applicable technical criteria.
Mineral reserve
The economically mineable part of a resource, demonstrated through technical, legal, and economic studies.
Remote sensing
Territorial observation by orbital or airborne sensors without direct surface contact.
Traceability
The ability to identify a piece of information's origin, transformations, limits, and revisions.