Ore body of Rajpura Dariba deposit is divided into four lodes i.e. Main, South, North & East Lode. East lode is parallel to south lode in upper extremity but in lower depth, it is parallel to Main & North lode.
Underground Mining
The general surface RL of RDM is around 500mRL. The existing working depth of working is varying from 300m in north lode to 620m in main lode. The mine can be approached by 3 accesses from surface shown as under with details:
- Main Shaft (Surface to -92mRL)
o Total Depth : 611m (501 to -110mRL);
o Working Depth : 593m (501 to -92mRL);
o Purpose & Capacity : Man winding (40 persons) & Ore hoisting (0.9mtpa).
- Auxiliary Shaft (Surface to 0mRL)
o Total Depth : 509mRL (501 to -8mRL);
o Working Depth : 501m (501 to 0mRL);
o Purpose & Capacity : Man winding (14 persons).
- Ramp
o Total Depth : 658m (501 to -157mRL);
o Purpose & Capacity : Ore hauling (1.0mtpa) & transportation.
Blast Hole Stoping Method (BHS) is being applied in the mining blocks where the ore body width is narrow and varying from 8 to 15m. The entire strike length is divided into 20m long panels, designated as primary and pillar stopes. The stopes are mined using DTH (115mm) holes for down drilling from the upper drill level. Blasting is done against a slot raise. The stopes are back filled with cement fill after removal fore.
Vertical Retreat Mining (VRM) was adopted at Rajpura Dari ........
