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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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Mine Ventilation MCQ Questions - Part 04 | Indian Minerology
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Mine Ventilation MCQ Questions - Part 04
🌬️ Mine Ventilation MCQ Questions - Part 04
46. Ventilation “leakage” in mines means:
A. Fresh air supply
B. Air short-circuiting through stoppings/doors
C. Recirculation
D. None
Show Answer
Answer: B. Air short-circuiting through stoppings/doors
47. High leakage reduces:
A. Fan efficiency
B. Ventilation effectiveness
C. Both A and B
D. None
Show Answer
Answer: C. Both A and B
48. Which construction is mainly used to reduce leakage in galleries?
A. Brattices
B. Stoppings
C. Air crossing
D. Trap doors
Show Answer
Answer: B. Stoppings
49. Temporary stoppings are generally made of:
A. Brick masonry
B. Concrete
C. Brattice cloth or wooden boards
D. RCC wall
Show Answer
Answer: C. Brattice cloth or wooden boards
50. Permanent stoppings should be constructed from:
A. Masonry / Brick wall / RCC
B. Cloth
C. Canvas brattice
D. None
Show Answer
Answer: A. Masonry / Brick wall / RCC
51. In fiery seams, stoppings should be:
A. Air tight / explosion proof
B. Cloth only
C. Poly sheet
D. None
Show Answer
Answer: A. Air tight / explosion proof
52. Air doors are provided generally to:
A. Control haulage
B. Maintain ventilation circuit continuity
C. Detect gas
D. Create stoppings
Show Answer
Answer: B. Maintain ventilation circuit continuity
53. Regulators in ventilation are used to:
A. Vary resistance of an airway
B. Stop leakage
C. Inject gas
D. Pump water
Show Answer
Answer: A. Vary resistance of an airway
54. Splits of air in mines are balanced by:
A. Obstructions
B. Regulators
C. Booster fan
D. Flameproof fan
Show Answer
Answer: B. Regulators
55. An air cross-over in mine ventilation is:
A. Horizontal passage to separate intake & return
B. Fan arrangement
C. Natural split
D. Leakage area
Show Answer
Answer: A. Horizontal passage to separate intake & return
56. Booster fans are placed in:
A. Airways underground to improve circulation
B. Surface only
C. Inside sealed areas
D. Along raises
Show Answer
Answer: A. Airways underground to improve circulation
57. Auxiliary fans are generally used with:
A. Stoppings
B. Brattice cloth ducts
C. Shafts
D. Booster fans
Show Answer
Answer: B. Brattice cloth ducts
58. Leakage percentage in a mine is calculated by:
A. (Q intake – Q return)/Q intake × 100
B. (Q return – Q intake)/Q return × 100
C. Q² loss × 100
D. None
Show Answer
Answer: A. (Q intake – Q return)/Q intake × 100
59. A good ventilation system should control:
A. Gas concentration
B. Dust levels
C. Temperature & humidity
D. All of the above
Show Answer
Answer: D. All of the above
60. DGMS requires auxiliary ventilation ducts to be extended:
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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