Processing & metallurgy
Mine Safety & Legislation
5 self-contained study topics — notes, diagrams, formulas, and worked examples for exams and GATE.
Topics
- Mine Safety LegislationIndian mining is governed by Coal Mines Regulations and Metalliferous Mines Regulations under DGMS — statutory exams for manager and surveyor, gas-category limits on explosives, and minimum ventilation per worker and diesel tonne.
- Hazard Control in Underground MinesUnderground hazards include methane above 5% LEL, respirable dust above statutory mg/m³, and roof fall during depillaring. Inertisation lowers O₂ for fire fighting; permit-to-work controls hot work near gassy zones.
- Gas and Dust MonitoringGas monitoring converts ppm to mg/m³ via molecular weight; methane layers at roof in low velocity. Coal dust explosibility pentagon requires fuel, O₂, ignition — stone dust inerts fuel side in Indian coal mines.
- Mine Rescue OperationsMine rescue uses SCBA with limited duration — fresh-air base advance timed to maintain retreat path. Refuge chambers sized for O₂ supply and CO₂ scrubber capacity until rescue; DGMS mandates brigade drills.
- Safety Audit and ComplianceSafety audits track IFR = incidents×10⁶/hours and close non-conformances on schedule. ISO 45001 SMS integrates risk matrix (likelihood × consequence) — management of change required before new mining procedures.