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Based on a global compilation of whole-rock geochemical data, Sr/Y and Sr/MnO are identified as effective discriminators between ore-forming and unprospective intrusions in the porphyry Cu setting. Intrusive rocks are classified into three fertility groups: prospective, unprospective, and mixed-signal, which are designed to assist explorers as a discrimination tool, narrowing the exploration search-space in porphyry Cu districts. Portable X-Ray fluorescence (pXRF) data of Sr, Y and MnO were collected on pulp powders and rock slabs from six porphyry Cu (± Mo ± Au) districts. Pre-and post-mineralization intrusions from porphyry Cu districts have lower Sr/Y and Sr/MnO values than syn-

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