Colliery Site & Panel StratigraphyDEMO SYNTHETIC
Bhowra-West Colliery (Demo Mine) • Stratigraphic Profile
Jharia Coalfield, Dhanbad • DGMS Dhanbad Central Circle • Seam VII/VIII Combined Working
Barakar Geological Formation & Overburden
The working coal seam (VII/VIII combined, thickness 4.2m) occurs at depths ranging from 185m to 265m below ground surface. The overburden comprises interbedded medium-to-coarse Barakar sandstones (62%), sandy shales (24%), and carbonaceous shales (14%) with empirical draw angle θ = 32°.
Angle of Draw: 32°
Rock Mass Rating: 58 (Fair)
Extraction Method & Hydraulic Stowing
Bord and pillar method with continuous depillaring under hydraulic sand stowing. River sand is pumped underground through 150mm borehole ranges at 1:2.5 solid-to-water ratio to minimize surface trough subsidence beneath the Indian Railways Chandrapura-Adra siding.
Stowing Void Fill: 92.4%
Safety Buffer: 45m Railway
Underground Extraction Panels Register (4 Active Working Districts)DGMS Form IV Registry
| Panel Code | Working District | Seam Depth | Extraction Technique | Telemetry Stations | Condition | Action |
|---|---|---|---|---|---|---|
| P-101 | Panel P-101 (North Working) | 185m | Continuous Miner / Depillaring | SN-101 to SN-104 (4 Nodes) | Advisory[L1] | GIS |
| P-102 | Panel P-102 (East Incline) | 215m | Bord and Pillar | SN-105 to SN-108 (4 Nodes) | Normal[L0] | GIS |
| P-103 | Panel P-103 (Central Seam VII) | 265m | Bord and Pillar (Depillaring with Stowing) | SN-109 to SN-112 (4 Nodes) | Normal[L0] | GIS |
| P-104 | Panel P-104 (South Barrier) | 150m | Bord and Pillar Standing on Pillars | SN-113 to SN-116 (4 Nodes) | Normal[L0] | GIS |