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DGMS CMR 2026: Latest Changes in Coal Mines Regulations (CMR 2017) DGMS CMR 2026: Latest Changes in Coal Mines Regulations Explained The Directorate General of Mines Safety (DGMS) has introduced important updates under the Coal Mines Regulations, 2017 (CMR) during 2025–26 to strengthen safety, supervision, and statutory compliance in coal mines across India. This article explains only the confirmed changes within CMR , without including draft rules or general safety circulars. 1. Amendment in Regulation 30 – Assistant Manager Provisions DGMS has amended Regulation 30 of CMR 2017 through a Gazette Notification to revise requirements related to Assistant Managers . Key Changes The number of Assistant Managers is now linked to mine production and operational scale High-production coal mines must deploy additional Assistant Managers At least one Assistant Manager must hold a First Class Manager’s Certificate in large mines Impact: Thi...
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Mining Safety MCQ Questions - Part 02 | Indian Minerology
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Mining Safety MCQ Questions - Part 02
⛑️ Mining Safety MCQ Questions - Part 02
16. The permissible limit of CO in mine air is:
A. 25 ppm
B. 50 ppm
C. 100 ppm
D. 200 ppm
Show Answer
Answer: A. 25 ppm
17. The primary gas causing explosions in underground coal mines is:
A. Carbon dioxide
B. Methane
C. Nitrogen
D. Oxygen
Show Answer
Answer: B. Methane
18. The main function of auxiliary fans in mines is:
A. Improve lighting
B. Supply or exhaust air to inside headings
C. Mix gases
D. Run machinery
Show Answer
Answer: B. Supply or exhaust air to inside headings
19. The main instrument used for methane detection in mines is:
A. Hygrometer
B. Flame safety lamp
C. Methanometer
D. Oxygen meter
Show Answer
Answer: C. Methanometer
20. The minimum quantity of air required per miner in India is approximately:
A. 2 m³/min
B. 3.5 m³/min
C. 6 m³/min
D. 10 m³/min
Show Answer
Answer: B. 3.5 m³/min
21. Mine rescue team members must undergo training at least:
A. Once a month
B. Twice a year
C. Every month
D. Every 6 months
Show Answer
Answer: D. Every 6 months
22. Which gas is lighter than air and accumulates near roof?
A. Methane
B. CO2
C. SO2
D. H2S
Show Answer
Answer: A. Methane
23. Flame in flame-safety lamp elongates in presence of:
A. Oxygen
B. Blackdamp
C. Firedamp
D. Moist air
Show Answer
Answer: C. Firedamp
24. The standard duration of a self-contained self-rescuer (SCSR) is:
A. 15 min
B. 30 min
C. 45 min
D. 60 min
Show Answer
Answer: B. 30 min
25. In Indian coal mines, percentage of incombustible content in stone dusting must be at least:
A. 25%
B. 40%
C. 60%
D. 80%
Show Answer
Answer: D. 80%
26. Balanced ventilation means:
A. Equal intake & return air
B. Air circulation without fans
C. Ventilation stopping balance
D. Natural ventilation
Show Answer
Answer: A. Equal intake & return air
27. In mines, CO is dangerous because:
A. Causes explosion
B. Combines with haemoglobin
C. Reduces oxygen carrying capacity of blood
D. Both B and C
Show Answer
Answer: D. Both B and C
28. The “Return airway” in a mine denotes:
A. Intake route of fresh air
B. Passage carrying used/contaminated air out
C. Rescue escape way
D. Ventilation stoppings
Show Answer
Answer: B. Passage carrying used/contaminated air out
29. Rescue stations are mandatory in coalfields beyond:
ADVANCING AND RETREATING LONGWALLS:- Advancing Longwalls:- In this method, the face start point is close to the main headings, usually leaving a barrier pillar to protect them. Once the face equipment is installed, extraction commences working away from the main headings towards the block limit. Obviously the main and tailgates do not exist prior to the start of extraction and have to be formed at each end of the face as mining progresses. The gate roads are effectively in the goaf and a false rib has to be installed on one side, usually by constructing a small pillar, sometimes using stone cut from the roof in thin seams or using some type of cementitious material brought into the mine. Such gate roads tend to require a very heavy support system (yielding steel arches have often been used). Principle of advancing longwall Advancing longwalls were once common in Europe in relatively thin seams where packs were constructed using stone, which had ...
Which is the deepest mine in India? Which is the deepest mine in India? Mining is all about who well you can dig and how deep you can dig to get the desired mineral. In the process, India have also evolved to innovate methods to dig deep and have constructed one of the world's deepest mines.
Continuous Miner:- Continuous Miner:- A continuous miner is a mining machine that produces a constant flow of ore from the working face of the mine. The machine continuously extracts as it is loading coal with a cutting steel drum and conveyor system. Continuous miners are typically used in room and pillar mining operations. The continuous miner is different from conventional or cyclical mining methods, which halt the extraction process in order for ore-loading to proceed. Continuous miners, which began to take off in the mining industry in the 1940s, make up of 45 percent of the underground coalmine production. Today, continuous miners are being developed as driverless machines controlled via remote control. History:- Early Miners:- The continuous miner has been available in some form since the late 1800s. The first machine to resemble a continuous miner was known as the English Channel Machine. The pneumatically driven machine could travel 1.5 miles (2...
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