MAJOR COAL PRODUCING COMPANIES IN INDIA

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INDIAN MINING & CONSTRUCTION EQUIPMENT INDUSTRY

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BACKGROUND & HISTORICAL TRENDS Construction and mining equipment cover a variety of machinery such as hydraulic excavators, wheel loaders, backhoe loaders, bull dozers, dump trucks, tippers, graders, pavers, asphalt drum / wet mix plants, breakers, vibratory compactors, cranes, fork lifts, dozers, off-highway dumpers (20T to 170T), drills, scrapers, motor graders, rope shovels etc. They perform a variety of functions like preparation of ground, excavation, haulage of material, dumping/laying in specified manner, material handling, road construction etc. These equipments are required for both construction and mining activity. With a wide production capacity base, India is perhaps the only developing country, which is totally self-reliant in such highly sophisticated equipment. India has only a few, mainly medium and large companies in the organized sector who manufacture these. The technology barriers are high, especially with respect to mining equipment and therefore the role of SM...
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Coal Industry in India – A retrospect, Nationalisation of Coal Mines

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Questionare on CMR & CMA

Questionare on CMR & CMA   Q1. Which cut is used for solid blasting in Indian coal Mines a)  Fan cut  b) burn cut  c) wedge cut d) drag cut   Q2. Permitted explosives are safe to use because a) They have less strength b) they have low velocity of detonation c) they do not produce much noise during blasting d) special chemical are used to extinguish the spark produced during blasting.   Q3. Burden is the distance between a)      Two blast holes in same row b)      distance between two rows c)       distance between first row of blast holes and bench d)      d) none of the above   Q4. Which of the following explosive have maximum strength a)      ANFO b) TNT c) RDX d) Nitroglycerine   Q5. To measure the performance of blasting which factor is calculated a)   Tonnage factor  b) space facto...
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