The complex geology and tectonic setting of the Philippine island arc system resulted in the deposition of different types of economic deposits throughout the archipelago. One of the most prolific mineral districts in the Philippines is the Mankayan Mineral District in Benguet province, north Luzon (Figure 1). It hosts the well-studied Far Southeast porphyry copper deposit, Lepanto high sulfidation epithermal deposit and the Victoria intermediate sulfidation epithermal deposit. However, the district also hosts other deposits that have yet to be investigated in detail, such as the Suyoc epithermal deposit located four kilometers south of the Lepanto deposit. The Suyoc deposit has a long history of gold mining especially by artisanal miners, but only limited published data is available. This study presents a detailed characterization of the geology and mineralization characteristics of the epithermal mineralization in Suyoc from field data, ore mineralogy, fluid inclusion properties and O and H isotope values. CITATION: Gabo-Ratio, J A, Soberano, O B, Queano, K L, Yumul Jr, G P and Yonezu, K, 2019. Geology and mineralization in the Suyoc epithermal deposit, Mankayan District, Philippines: insights from ore mineralogy, fluid inclusion microthermometry and stable isotope studies, in Proceedings PACRIM 2019, pp 138140 (The Australasian Institute of Mining and Metallurgy: Melbourne).