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The rare earth occurrences were initially classified into the following deposit types: carbonatites, carbonatites with residual enrichment, alkaline igneous complexes, hydrothermal iron-oxide deposits, deposits hosted by metamorphic rocks, shoreline placer deposits, alluvial placer deposits, paleoplacers, ion adsorption weathering crusts, phosphorites, uranium deposits, and "Other", a miscellaneous and unkown deposits category. To decrease the number of deposits classified as "Other", the following categories were added: other igneous-affiliated deposits (including pegmatites and veins) and placers of unkown origin. In addition, subcategories were used within the "Other" category for deposits of known deposit type, but with too few rare earth occurrences to justify a separate category. Sub-categories within "Other" include:

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