Indian Minerology: Global Mining Engineers Blog; Miners Study Hub. Master open-cast and underground operations, safety rules, machinery tips, quizzes and career guides worldwide. Subscribe for updates! #MiningEngineersBlog, #OpenCastMining, #UndergroundMining, #IndianMinerology, #WorldWideMining, #Mining Engineering Blog | DGMS Preparation | Open Cast Mining
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...
Get link
Facebook
X
Pinterest
Email
Other Apps
Mine Ventilation MCQ Questions - Part 01 | Indian Minerology
Get link
Facebook
X
Pinterest
Email
Other Apps
-
Mine Ventilation MCQ Questions - Part 01
🌬️ Mine Ventilation MCQ Questions - Part 01
1. The main purpose of mine ventilation is:
A. To cool machinery
B. To provide fresh air and dilute gases
C. To improve illumination
D. To drain water
Show Answer
Answer: B. To provide fresh air and dilute gases
2. Which gas is called "firedamp" in mines?
A. Methane
B. Carbon Monoxide
C. Nitrogen
D. Hydrogen
Show Answer
Answer: A. Methane
3. The normal oxygen percentage in mine air should be at least:
A. 14%
B. 16%
C. 19%
D. 21%
Show Answer
Answer: D. 21%
4. Blackdamp in mines is a mixture of:
A. CO + CH4
B. CO2 + N2 with low oxygen
C. SO2 + O2
D. Only nitrogen
Show Answer
Answer: B. CO2 + N2 with low oxygen
5. Which unit is used to measure airflow in mines?
A. m/s
B. m³/s or m³/min
C. Pascal
D. kg/m³
Show Answer
Answer: B. m³/s or m³/min
6. The statutory limit of CO in airways is:
A. 25 ppm
B. 50 ppm
C. 100 ppm
D. 200 ppm
Show Answer
Answer: A. 25 ppm
7. The term "Quantity of Air" in mines refers to:
A. Air pressure
B. Air volume per unit time
C. Fan speed
D. Gas % only
Show Answer
Answer: B. Air volume per unit time
8. The normal velocity of intake air in mine roadways is usually:
A. 0.1–0.5 m/s
B. 0.5–2.5 m/s
C. 3–5 m/s
D. Above 10 m/s
Show Answer
Answer: B. 0.5–2.5 m/s
9. The instrument used to measure air velocity in mines is:
A. Psychrometer
B. Anemometer
C. Barometer
D. Hygrometer
Show Answer
Answer: B. Anemometer
10. Methane explosive range in air is between:
A. 1% – 5%
B. 2% – 8%
C. 5% – 15%
D. 15% – 30%
Show Answer
Answer: C. 5% – 15%
11. Threshold limit value (TLV) of CO2 in mine air is about:
A. 0.25%
B. 0.5%
C. 1%
D. 2%
Show Answer
Answer: A. 0.25%
12. Which law governs the pressure loss due to air friction in mine airways?
A. Boyle’s Law
B. Dalton’s Law
C. Atkinson’s Law
D. Charles’ Law
Show Answer
Answer: C. Atkinson’s Law
13. The main pollutant gas during spontaneous heating of coal is:
A. Methane
B. Carbon monoxide
C. Hydrogen
D. Nitrogen
Show Answer
Answer: B. Carbon monoxide
14. The SI unit of mine air pressure is:
A. Pascal (Pa)
B. Torr
C. bar
D. mmHg
Show Answer
Answer: A. Pascal (Pa)
15. The statutory minimum quantity of air per person in an Indian coal mine is:
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...
Comments