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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 03 | Indian Minerology
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Longwall Mining MCQ Questions - Part 03
Longwall Mining MCQ Questions - Part 03
31. Which of the following is an equipment used alongside shearer in Longwall mining?
A. Armoured Face Conveyor (AFC)
B. Dragline
C. Bucket Wheel
D. Jackhammer
Show Answer
Answer: A. Armoured Face Conveyor (AFC)
32. What is the typical panel width in Longwall mining?
A. 50–100 m
B. 150–400 m
C. 500–1000 m
D. Above 1200 m
Show Answer
Answer: B. 150–400 m
33. Longwall top coal caving is more suitable for seam thickness:
A. < 1.5 m
B. 2–3 m
C. > 4.5 m
D. Very thin seams
Show Answer
Answer: C. > 4.5 m
34. Which is the primary cutting principle of Longwall plough?
A. Rotary cutting
B. Chisel action
C. Impact blasting
D. Scrapping action
Show Answer
Answer: D. Scrapping action
35. The main gate and tail gate are driven for:
A. Panel entry & exit
B. Haulage & ventilation
C. Power & water supply
D. All of the above
Show Answer
Answer: D. All of the above
36. The normal shearer cutting speed in Longwall mining is:
A. 1–2 m/min
B. 10–20 m/min
C. 50–60 m/min
D. Over 100 m/min
Show Answer
Answer: A. 1–2 m/min
37. The goaf area in Longwall mining refers to:
A. Developed gate road
B. Caved out area behind supports
C. Fresh panel
D. None
Show Answer
Answer: B. Caved out area behind supports
38. The main advantage of retreat Longwall over advancing Longwall is:
A. Better roof control
B. Faster development
C. Simpler ventilation
D. None
Show Answer
Answer: A. Better roof control
39. The hydraulic fluid used in powered supports is generally:
A. Water-emulsion type
B. Pure oil
C. Diesel
D. None
Show Answer
Answer: A. Water-emulsion type
40. The face advance rate in Longwall depends mainly on:
A. Cutting rate of shearer
B. Roof conditions
C. Availability of supports
D. All of the above
Show Answer
Answer: D. All of the above
41. What is meant by 'weighting' in Longwall mining?
A. Roof load coming on supports
B. Coal weight measurement
C. Haulage load
D. None
Show Answer
Answer: A. Roof load coming on supports
42. Periodic weighting in Longwall mining indicates:
A. Regular heavy loads on supports
B. Random failures
C. Gas outbursts
D. None
Show Answer
Answer: A. Regular heavy loads on supports
43. Which of the following is NOT a Longwall equipment?
A. Shearer
B. Powered supports
C. Dragline
D. AFC
Show Answer
Answer: C. Dragline
44. The gas most commonly associated with Longwall faces is:
A. Carbon monoxide
B. Methane
C. Sulphur dioxide
D. Oxygen deficiency
Show Answer
Answer: B. Methane
45. Longwall mining is most economical when:
A. Seam is thick & uniform
B. Seam is highly steep
C. Seams are irregular
D. Pillar system is better
Show Answer
Answer: A. Seam is thick & uniform
📚 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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