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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 03 | Indian Minerology
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Mine Ventilation MCQ Questions - Part 03
🌬️ Mine Ventilation MCQ Questions - Part 03
31. A common method of ventilation survey in mines is:
A. Pressure/quantity measurement
B. Dust Sampling
C. Explosive survey
D. Liquid testing
Show Answer
Answer: A. Pressure/quantity measurement
32. Tracer gas method is used to measure:
A. Air quantity
B. Ventilation leakage
C. Fan efficiency
D. Gas drainage
Show Answer
Answer: B. Ventilation leakage
33. Methanometer is used to measure:
A. Air velocity
B. Methane percentage
C. Oxygen percentage
D. Dust concentration
Show Answer
Answer: B. Methane percentage
34. Flame safety lamp is primarily used for:
A. Lighting
B. Detection of firedamp
C. Detect oxygen depletion
D. Both B and C
Show Answer
Answer: D. Both B and C
35. Psychrometer is used to measure:
A. Air pressure
B. Air humidity / wet bulb temperature
C. Gas dilution rate
D. Dust %
Show Answer
Answer: B. Air humidity / wet bulb temperature
36. Gas chromatography in mines is generally used for:
A. Methane measurement
B. Analysis of sealed off areas
C. Dust suppression
D. Ventilation survey
Show Answer
Answer: B. Analysis of sealed off areas
37. The “CO make” in sealed areas is an indicator of:
A. Ventilation leak
B. Spontaneous heating
C. Methane layering
D. Fan stoppage
Show Answer
Answer: B. Spontaneous heating
38. What is the statutory maximum percentage of CH4 allowed in working places?
A. 0.5%
B. 1.0%
C. 1.25%
D. 2%
Show Answer
Answer: C. 1.25%
39. Which instrument measures gas concentration continuously?
A. Chemical tubes
B. Electronic gas detector
C. Flame lamp
D. Dust sampler
Show Answer
Answer: B. Electronic gas detector
40. Ventilation survey is generally recorded in:
A. Form 6A book
B. Survey register
C. Gas report register
D. Manager’s diary
Show Answer
Answer: A. Form 6A book
41. A common location where methane layering occurs is:
A. Near shaft bottom
B. In return airway
C. At roof of stagnant places
D. Near intake airway
Show Answer
Answer: C. At roof of stagnant places
42. Gas detectors used for rescue work are generally:
A. Multi-gas portable detectors
B. Only flame lamps
C. Humidity sensors
D. Dust samplers
Show Answer
Answer: A. Multi-gas portable detectors
43. The primary gas to monitor during mine fires is:
A. Oxygen
B. Methane
C. Carbon monoxide
D. Nitrogen
Show Answer
Answer: C. Carbon monoxide
44. Methane layering is dangerous because:
A. Causes suffocation
B. Explosive when mixed with air in range 5–15%
C. Increases humidity
D. Blocks intake
Show Answer
Answer: B. Explosive when mixed with air in range 5–15%
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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