Visualization of gitological contexts in a bivariate diagram ²⁰⁸Pb/²⁰⁴Pb vs ²⁰⁶Pb/²⁰⁴Pb. The margin of error of the measurements is smaller than the diameter of the point. The Pb-Zn-Cu veins (in shades of grey) can be redistributed by Gaussian mixtures models: three coherent groups are then obtained. Variscan and Permian sulphide veins line up along the same regression curve and could therefore be grouped into a single group. Only the remobilizations create an overlaps effect of signatures with the Ladinian tectonic breccias and stratiform Mesozoic deposits.