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In this work, were examined 17 types of 960 réis coins by XRF, in which the base coin had been 8 reales made with raw materials from Mexican mines. In addition to characterizing the elemental structure of the coins, the XRF data were examined using multivariate analytical approach to Robust Principal Component Analysis (ROBPCA), which was made use of to classify the coins centered on their elemental composition. However, with XRF, elementary info is acquired for a depth of only a