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The use of efficient methods for data processing has always been of interest to researchers in the field of earth sciences. Pattern\udrecognition techniques are appropriate methods for high-dimensional data such as geochemical data. Evaluation of the geochemical\uddistribution of rare earth elements (REEs) requires the use of such methods. In particular, the multivariate nature of REE data makes them a good target for numerical\udanalysis. The main subject of this paper is application of unsupervised pattern recognition approaches in evaluating geochemical\uddistribution of REEs in the Kiruna type magnetite–apatite deposit of Se-Chahun. For this purpose, 42 bulk\udlithology samples were collected from the Se-Chahun iron ore deposit. In this study, 14 rare earth elements were measured with inductively\udcoupled plasma mass spectrometry (ICP-MS). Pattern recognition makes it possible to evaluate the relations between the samples based on\udall these 14 features, simultaneously. In addition to providing easy solutions, discovery of the hidden information and relations of\uddata samples is the advantage of these methods. Therefore, four clustering methods (unsupervised pattern recognition) –\udincluding a modified basic sequential algorithmic scheme (MBSAS), hierarchical (agglomerative) clustering,\ud<i>k</i>-means clustering and self-organizing map (SOM) – were applied\udand results were evaluated using the silhouette criterion. Samples were clustered in four types. Finally, the results of this study were\udvalidated with geological facts and analysis results from, for example, scanning electron microscopy (SEM), X-ray diffraction (XRD), ICP-MS and\udoptical mineralogy.  The results of the <i>k</i>-means clustering and SOM methods have the best matches with reality, with experimental studies of samples and with field\udsurveys. Since only the rare earth elements are used in this division, a good agreement of the results with lithology is\udconsiderable. It is concluded that the combination of the proposed methods and geological studies leads to finding some hidden\udinformation, and this approach has the best results compared to using only one of them

Application of unsupervised pattern recognition approaches for exploration of rare earth elements in Se-Chahun iron ore, central Iran