Geochemistry of surface waters associated with an undisturbed Zn-Pb massive sulfide deposit: Water-rock reactions, solute sources and the role of trace carbonate

►Solutes controlled by binary mixing between silicate and trace carbonate weathering. ►Cl/Ca ratios indicate host metavolcanic rocks are an important source of Cl. ►Oxidation of sulfide mineralization accounts for 60% of the dissolved sulfate. ►Sulfide oxidative weathering accounts for ~ 20% of the cation flux in the watershed. ►Cation denudation and CO2 consumption rates similar to watersheds in western Canada.