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The minerals system approach to mineral exploration mirrors in many ways the petroleum system model utilised successfully in the hydrocarbons industry for many decades. However, unlike the petroleum sector, which is concerned exclusively with the timely convergence of generation, transport, and trapping of liquid and gaseous hydrocarbons, mineral systems commonly involve generation of multiple fluids that must interact in order to precipitate (“trap”) metals. While there is a large diversity of types of mineral deposits ranging from those formed in magmatic systems to those in metamorphic environments, here we examine a basin-hosted sedimentary system in Ireland which has several similarities, but also key differences, with a classical petroleum system. Mineral exploration for sediment-hosted deposits increasingly on the intersection of basin modelling and mineral systems modelling to integrate the physical basin modelling geometries with the quantitative chemical descriptions of the subsurface, simulating the migration and chemical evolution of fluids from a metal source to the deposit sink that may include ingress of a second fluid containing reduced sulphur. Integration of geochemical and geophysical data is fundamental for this workflow which will also increasingly involve complex computer modelling.