(a) Mine tailings site locations in the uranium mine surrounded by the drainage channel. (b) Earthen cover to prevent contact between infiltrated rainwater and mine tailings, including a bentonite layer with low permeability to prevent contact between infiltrated rainwater and mine tailings, a gravel layer with high permeability to drain rainwater blocked by the bentonite layer, and a vegetation layer to prevent the outflow of the gravel layer. (c) Numerical model consisting of three layers representing the earthen cover, where A, B, and C correspond to the vegetation, gravel, and bentonite layer, respectively.