3D simulation results and animations of copper leaching, transport and deposition in sedimentary basins during the synrift stage according to Scenario 1 in Bahlali et al. (2025). Models are built using surface-based modelling approach (doi:10.1007/s11004-018-9764-8). Flow simulations are run with IC-FERST (multifluids.github.io), using unstructured tetrahedral meshes that adapt to geological heterogeneity and flow behaviour throughout the simulation to improve simulation quality and performance. Folder structure: Simulation: Contains 3D unstructured adaptive mesh output in .vtu format (openable with ParaView, www.paraview.org). Time interval between successive outputs is 50,000 years. Animations: Includes Supplementary Video (SV1) visualising brine circulation over the synrift period.