<b>Original and Augmented Dataset of Hydrochemical Characteristics of Pingshuo Mining area, with HCGA Cases Results.</b>

<p dir="ltr">The Pingshuo mining area comprises a vertically differentiated groundwater system that includes Quaternary loose rock Shallow pore aquifer (SW), Carboniferous-Permian Roof sandstone fractured aquifer (RW), dynamic replenishment Goaf water (GW), and Ordovician carbonate karst-fissure aquifer (OW), which affected by progressive coal extraction. Groundwater groups were assigned from sampling records and hydrogeological information independently of subsequent hydrochemical classification. </p><p dir="ltr">The dataset comprised 260 groundwater samples collected between 2008 and 2024, including 168 samples from routine monitoring, 61 samples collected during field campaigns in 2023-2024 and 31 samples compiled from previous investigations.</p><p dir="ltr">Model data and training checkpoints of the HCGA models trained for Cases 3–6 and IF Cases 1–2 are included.</p>