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SHORT NOTES ON DGMS(Tech.) (S&T) Circular No. 02 of 2025

DGMS(Tech.) (S&T) Circular No. 02 of 2025

Guidelines on minimum air quantity at Continuous Miner and

Long-wall panels.

1) Reg. 153(1) of CMR, 2017:

• Clear away smoke, steam, and dust.
• Dilute harmful or noxious gases to make them harmless.
• Provide sufficient oxygen.
• Prevent excessive rises in temperature or humidity that may harm health.

2) Reg. 153(2)(a) of CMR, 2017:

• At least 6 m3 per minute of air per person on the largest shift, or
• At least 2.5 m3 per minute per tonne of daily output, whichever is larger.
• The air should pass through the last ventilation connection (LVC) of the district, meaning the in-bye gallery where the air
• passes.

3) Challenges with High Air Quantity:

• A large quantity of air must be delivered to the mass production panels (MPP).
• This large air quantity can lead to excessive dust in the LVC of the MPP and may overburden the mine’s mechanical ventilation system.
• High ventilation pressure could increase the risk of spontaneous heating, compromising the safety of the mine.

4) R&D Project:

• The project titled "Requirement of Air in Mass Production Technology" was conducted by CMPDIL, Ranchi, to address challenges in ventilating Mass Production Panels (MPPs).

5) Workshop on Ventilation:

• A workshop on "Assessment of ventilation requirement for underground Coal Mines adopting mass production technology in India" was organized by M/s ECL and M/s
• CMPDIL at the Jhanjra Project of M/s ECL.
• The workshop involved detailed deliberations with professionals, researchers, and academics.