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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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Longwall Mining MCQ Questions - Part 01 | Indian Minerology
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Longwall Mining MCQ Questions - Part 01
Longwall Mining MCQ Questions - Part 01
1. Where is the Longwall mining method best suited?
A. Flat and moderately dipping seams
B. Steeply dipping seams
C. Broken and disturbed seams
D. Anywhere
Show Answer
Answer: A. Flat and moderately dipping seams
2. What is the primary equipment used to cut coal in Longwall mining?
A. Shearer
B. Dragline
C. Continuous miner
D. Scooptram
Show Answer
Answer: A. Shearer
3. What is the typical face length in Longwall mining?
A. 100 to 300 meters
B. 10 to 50 meters
C. 300 to 600 meters
D. 600 to 1000 meters
Show Answer
Answer: A. 100 to 300 meters
4. What kind of roof support is used in Longwall mining?
A. Hydraulic powered supports
B. Manual timber supports
C. Steel arches
D. None of the above
Show Answer
Answer: A. Hydraulic powered supports
5. On what does Longwall mining productivity depend?
A. Seam thickness
B. Mining face length
C. Equipment efficiency
D. All of the above
Show Answer
Answer: D. All of the above
6. What is the main advantage of Longwall mining?
A. High production rate
B. Reduced labor requirements
C. Better roof control
D. All of the above
Show Answer
Answer: D. All of the above
7. Which equipment provides the best roof support in Longwall mining?
A. Powered roof supports
B. Timber supports
C. Steel arches
D. Hydraulic jacks
Show Answer
Answer: A. Powered roof supports
8. What is a major hazard in Longwall mining?
A. Roof collapse
B. Flooding
C. Gas leakage
D. All of the above
Show Answer
Answer: D. All of the above
9. What kind of mining process is used in Longwall mining?
A. Continuous mining
B. Selective mining
C. Surface mining
D. None of the above
Show Answer
Answer: A. Continuous mining
10. From which part is coal extracted in Longwall mining?
A. Mining face
B. Gate roads
C. Ribs
D. Shafts
Show Answer
Answer: A. Mining face
11. How is roof support provided during Longwall mining?
A. Hydraulic powered supports
B. Wooden props
C. Steel arches
D. No support
Show Answer
Answer: A. Hydraulic powered supports
12. What controls the face advance rate in Longwall mining?
A. Equipment efficiency
B. Roof conditions
C. Operator skill
D. All of the above
Show Answer
Answer: D. All of the above
13. What type of ventilation is required in Longwall mining?
A. Adequate ventilation to remove gases
B. No ventilation needed
C. Closed air circulation
D. No option
Show Answer
Answer: A. Adequate ventilation to remove gases
14. What is essential for sustainable success of the mining face in Longwall mining?
A. Strong roof support
B. Continuous monitoring
C. Efficient operation
D. All of the above
Show Answer
Answer: D. All of the above
15. How is roof fall controlled in Longwall mining?
A. Use of hydraulic powered supports
B. Installing timber props
C. No support
D. Chemical injection
Show Answer
Answer: A. Use of hydraulic powered supports
📚 Longwall Mining MCQ Series
"This series of questions has been designed to develop a deeper understanding of Longwall Mining and to aid in effective examination preparation.” ✅
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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