Please can anyone help us with the following? In an acidified headwater catchment underlain by paragneiss, we are using Mg, Ca and Sr isotope ratios to identify the proportion of these elements of geogenic and anthropogenic origin in the runoff. We isotopically analyzed 11 catchment compartments, including several organic pools and are aware of Mg, Ca isotope fractionations. We have the isotope composition of the main rock-forming and accessory minerals in addition to whole-rock isotope signatures. Individual minerals exhibit a wide range of Mg, Ca and Sr isotope ratios. For a rigorous interpretation of the data set we would need to know the relative dissolution rates of apatite, biotite, muscovite, albite, orthoclase and ilmenite. The reviewers will likely request a kinetic model to estimate the order of these six minerals from the fastest weathering to the slowest weathering mineral. We are aware of the complexity of such kinetic modelling. We believe a general sequence of weathering rates of these six minerals with some in-depth discussion of the uncertainties would do. As a rule, the reviewers are mostly sceptical about the relevance of equilibrium modelling, such as PHREEQC, and/or just invoking the Goldich (1938) and Bowen (1956) scheme. Would you know of a publication that would for any paragneiss site report kinetic modelling of mineral weathering considering as many minerals as possible, preferably also including ilmenite?