Rock Pozzolana

Salient Features of Maddhapara Hardrock Mine: 1. Location of the mine : Maddhapara, Dinajpur, Bangladesh. 2. Depth of rock : 124 meter from the surface. 3. Reserve and mine area : Reserve in the mine area of 1.0 km × 1.2 km =1.2 km 2   is 174 million tons 4. Point load strength : 24,000 psi 5. Annual Production : 1.65 million tons. 6. Life of the mine : Analysis based on 41 years (including development period) but mine operation life may be extended for more than 70 years. 7. Employment opportunity : Direct -766, Indirect – 10,000. 8. Method of mine : Room and Pillar/ Sub-Level Drift Stopping Method. 9. Mode of Entry (Length and dia. of shafts) : Two Vertical shafts (The length of the skip shaft is 380m and cage shaft 330 m. ...

About 1.2 square kilometer underlain deposit of hard rock at Maddhapara of district Dinajpur, may be a versatile source of pozzolana in Bangladesh. At present, the mine is designed to produce boulders and aggregates from the underground reserve to meet the requirement of flood control, construction of coastal and town protection embankment, construction and maintenance of bridges, roads and highways, embankment, river training, railway ballast, high rise buildings, decoration tiles and other heavy duty construction works. The rock deposit is overlain by about 140m of unconsolidated sediments. Below this, the basement is the Archean era and subdivided into the kaolinized granodiorite, the weathered granodiorite and fresh granodiorite. Dykes of micro-granodiorite (Fig. 1), fine grained silicified whitish granite (Fig. 2) and pegmatite is thinly inserted in the basement. In the upper part of the basement, the granodiorite was highly weathered and thus is friable. The rock exhibits gr...