problems faced by dragline machines used in mines
A Critical Investigation of Digging Time Segment of Draglines in a
Dragline is highly capital intensive equipment to procure, operate and maintain in any surface mining operation. Given this, every second of operation of this capital intensive equipment is absolutely important. As such, it is imperative to optimize the overall cycle time of this equipment in order to reap the benefits of this equipment to …
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Dragline
Draglines can be giant mining machines such as the "Big Muskie" weighing in at over 13 000 tons with a bucket capacity of 220 cubic yards or 325 tons ( American Electric Power, 2008 ). These machines efficiently excavate and cast overburden in one cyclical motion from a location on the top of the overburden.
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Open Pit Mining | IntechOpen
Open pit mining method is one of the surface mining methods that has a traditional cone-shaped excavation and is usually employed to exploit a near-surface, nonselective and low-grade zones deposits. It often results in high productivity and requires large capital investments, low operating costs, and good safety conditions. The main …
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Coal mining | Definition, History, Types, & Facts
coal mining, extraction of coal deposits from the surface of Earth and from underground. Mongolia: coal mine. Coal is the most abundant fossil fuel on Earth. Its predominant use has always been for …
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30 Dragline Operator Interview Questions and Answers
27. Describe an instance when you identified and reported a potential risk in the worksite. Safety is paramount in any job, but in roles like a Dragline Operator, where heavy machinery is involved, it becomes even more critical. Identifying and reporting potential risks is part of ensuring a safe work environment.
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(PDF) Reliability Analysis of a Dragline for
The failure of dragline was subjected to two major failure types: failure because of electrical components and failure because of mechanical components. The …
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(PDF) Economical Operation & Estimation of Operating Cost …
Economical Operation & Estimation of Operating Cost of Draglines in Open Cast Mines Atma Ram Sahu* and Dr. Hrushikesh Naik** *M.Tech. student, Mining Engg. Dept. NIT Rourkela **Associate Professor, Mining Engg. Dept. NIT Rourkela Abstract Draglines are the most expensive piece of excavating equipment at the mine site and it is important …
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Reliability Analysis of Dragline Using Equivalent Aging Model
Traditional models for reliability analysis of mining equipment are developed from time to failure data. However, inclusion of operational data and environmental stressors in reliability analysis makes models realistic and can predict the reliability as well as availability of equipment more precisely. It also allows us to understand the aging …
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(PDF) Open Pit Mining
Hani M. Alnawafleh. Open pit mining method is one of the surface mining methods that has a traditional cone-shaped excavation and is usually employed to exploit a near-surface, nonselective and ...
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(PDF) Productivity Analysis of Draglines Operating in
Last Updated: 31 Mar 2023. PDF | The tandem operation of draglines is in use in some of the major Indian opencast coalmines owing to the favourable geo-mining conditions,... | Find, read and...
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Selection Procedure of Draglines for Stripping Operations in Surface Mining
where (Q_{{wr}}) are workable coal reserves, thou t; (k) is the coefficient taking into account the decline in annual production at the beginning and end of the mine operation (for coal and shale deposits mined by the open-pit method 0.92–0.96); (T) is the asset life of main mining equipment, years [].. In the case of block mining, the …
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Applicability of Controlled Blasting in Large Opencast Mine at Dragline
Normal dragline blast of Jayant opencast project consists of detonation of 3-8 rows involving 16-70 blastholes in a round. Controlled blasting technique, line drilling was planned and line drill holes of 20 to 27 m depths were drilled at a spacing of 3 to 4 m. The line drill holes were kept at a distance of 4 m from the final production holes ...
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SCIENCE OF MINING MACHINES Recent …
Abstract—This paper discusses about the robust machine "Dragline", from century old techniques employed for power transmission, control and operation to the recent trends. …
ادامه مطلبRole of the Operator in Dragline Energy Efficiency
The dragline is one of the most energy-intensive equipments in surface coal mines. With high production rate and low cost of operation, draglines are commonly used for removing large amounts of overburden to expose coal seams for extraction. Draglines consume about 15–30% of total mine energy consumption. Improving dragline energy …
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Brochure SIMINE DRAGLINE EN
equipment at the point of common cou-pling (PCC). This feature can be used to minimize voltage fluctuations in the mine's distribution system. In addition, the AFE's high pulse rate, as registered by the net-work, results in a very low total harmonic distortion (THD), typically less than 2.5 %. These features improve the power quality
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(PDF) Reliability Analysis of a Dragline for
Dragline is a HEMM used in surface mines to remove overburden and dump into the decoaled area.The occurrence of failure of the dragline and its components influences the production of the mines ...
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Limestone extraction – underground mining techniques, drilling
The rock face to be gusted is typically 40-feet in width by 20- to 25-feet high. A premeditated pattern of 40 to 50 horizontal holes are drilled for the dimensions of 2 inches wide by 12- to 14-feet deep. ... Roof bolting equipment is also used in underground mining. The room and pillar type operations are undergone to recover the ore from both ...
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Glossary of Mining Terms
Panel - A coal mining block that generally comprises one operating unit. Panic bar - A switch, in the shape of a bar, used to cut off power at the machine in case of an emergency. Parting - (1) A small joint in coal or rock; (2) a layer of rock in a coal seam; (3) a side track or turnout in a haulage road.
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Critical Analysis of Tandem Dragline Performance in Open
Planning and managing equipment systems of surface mining are critical for achieving higher production and productivity. Poor performance of equipment systems can endanger the economic viability of mining operations []–[].OB removal is a major process in the surface mining of coal, accounting for over 60% of the mining cost [4, …
ادامه مطلبMaintenance and Performance Analysis of Draglines …
Boom Failures, Rope Failures, Ring Gear And Pulleys Failures Are Major Breakdowns Of Dragline Which Occur Due To Improper Maintenance Of System [4]. This Study Discusses About Calculating The Annual Output And Ownership Cost, Maintenance Of Dragline.
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(PDF) Productivity Analysis of Draglines Operating in
Using machine learning algorithms to predict cast blasting performance in surface mining predicted the performance of dragline in production (Rai et al. 2011), which involved removal of overburden ...
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Groundwater and coal mining
The majority of coal mines encounter groundwater during mining. The water creates environmental, operational and stability problems. Water also creates stability problems with dams, dykes and spoil piles, particularly on dragline mining projects. This paper describes typical problems and presents recommendations to deal with water …
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Appalachia comes up small in era of giant coal mines
The giant dragline can be operated with as few as three people, and each truck requires just one driver. Of course there are many more mine jobs other than excavating, but these mammoth machines ...
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Coal mining
Draglines are by far the most commonly used overburden-removal equipment in surface coal mining. A dragline sits on the top of the overburden, digs the overburden material directly in front of it, and disperses the material over greater distances than a shovel. Compared with shovels, draglines provide greater flexibility, work on higher benches ...
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Bayesian Network Approach for Dragline Reliability …
Frequent failures, faults, and various malfunc-tions of mining equipment are common. These failure events lead to substantial financial and production loss. In order to …
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"Giant Shovel on I-70"Ohio Strip Mine Fight: 1973
The February 1973 issue of Smithsonian magazine ran a dramatic shot of "The GEM of Egypt" in operation in the Egypt Valley of Ohio, just north of I-70, as the magazine featured a story on "the need for energy vs. strip mining.". Note size of the shovel's bucket relative to the vehicles on the road below. Photo, Arthur Sirdofsky.
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DRAGLINE PERFORMANCE STUDY IN INDIAN COAL MINES
Draglines are being used in coal mining. This equipment has been chosen because of its certain advantages like economically excavate deposits at greater and greater depths. Dragline is a one of the surfacemining equipment which is used to excavate materials and is so designed so that it can excavate below the level of the machine also.
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Old Dragline Machine | Maintenance & Repairs | Dragline Onsite …
Although an old dragline can be an essential part of mining operations, the equipment is not without fault or maintenance needs. Bottom line is, draglines don't last forever. They are among mining-class machines with booms that reach hundreds of feet into the sky. The cost of dragline machines is somewhere between $50M and $100M. …
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Dredging Practices and Environmental Considerations
Dragline buckets can be operated as a dredge from shore or mounted on a barge. The bucket does not load vertically. Instead, it is lowered to the bottom and then loaded by dragging toward the crane. A dipper dredge is a floating face shovel that digs forward into the face of the excavation and is mounted on a spud barge.
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Exploring 7 Excavator Types and Their Construction Site Roles
On the other side of the bucket is a dragline from the bucket to the cab. The machinery is operated with the hoist rope to raise and lower the bucket, while the dragline is used to drag the bucket towards the driver or the cab. For large-scale excavation and mining operations, dragline excavators are the heavy weights of choice.
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