Explore the Geochemical and Petrographic Characteristics of Low-Grade Limestone of Sidhi, M. P.

The growing depletion of high-grade limestone resources has necessitated the exploration and utilization of low-grade limestone deposits for industrial applications. This study investigates the geochemical and petrographic characteristics of low-grade limestone from the Majhgawan and Hinauti Extension areas of the Vindhyan Basin, Central India. Field-based stratigraphic analysis, borehole litholog interpretation, petrographic examination, and geochemical investigations (XRD and XRF) were conducted. The results reveal significant compositional variability across stratigraphic horizons, influenced by shale intercalations and dolomitization processes. Petrographic analysis indicates dominance of micritic calcite with minor dolomite and quartz, while geochemical results show variations in CaO (38–48%), MgO (3–12%), SiO₂ (5–20%), and Al₂O₃ (1–6%). These variations directly affect industrial suitability, particularly for cement manufacturing. The study highlights that selective mining, blending, and beneficiation strategies can enhance the usability of low-grade limestone.