The aim of this project is to simulate the effects of pore-scale variability on mineral dissolution and upscale the results to Darcy-scale reactive transport. In particular, we aim to develop a more generalizable approach for parameterizing intrinsic surface reactivity variability in pore-scale reactive-transport models. Furthermore, we propose an upscaling strategy to account for pore-scale results in Darcy-scale simulations, thereby improving the predictability of mineral dissolution at larger scales.