Thermal and geochemical footprints of low-temperature sedimentary rock-hosted hydrothermal Au-systems: identifying far-field vectors toward ore

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New mineral occurrences at the earth's surface are rare. Future discoveries will depend on subsurface exploration and this requires the far-field detection of such ore deposits. Sedimentary rocks are important hosts for world-class deposits of Au, Pb, Zn & Cu in Canada and the world. They form at <4-6 km depth from the upwelling of hot fluids derived from hotter levels of the crust. Defining the far-field expression of these systems is challenging owing to their low temperature (<200-250 C) and subtle, spatially restricted and poorly constrained, alteration halos.