This document discusses coal mining methods. It begins with an introduction and overview of the history of coal mining. It then describes and compares various surface mining techniques like strip mining and horizon mining as well as underground mining methods like bord and pillar, longwall and shortwall. Factors that influence the selection of mining methods and latest developments in coal mining techniques are also summarized. The conclusion restates that coal is an important energy source and mining methods continue to evolve and improve.
The mineral reserves & reserves estimation using triangular methods Numan Hossain
It includes the introduction about mineral reserves. It also introducing triangular method to estimate the mineral reserves. Here after solving related problems some relevant problems are introduced for practice.Hope, it will be helpful who wants to estimate ore reserves using triangular methods. Here, the differences between probable and proven reserves also displayed.
Longwall; Longwall in coal; Longwall in Hard Rock; Sublevel Caving; Characteristics of the ore body and mining method; Development; Production; Equipments Used; Block Caving, Introduction, Historical evolution of the method, Condition deposit; Principles of the method; Methodology of block caving; Basic issues of geomechanical to the black caving method; Caveability;Mine design Block caving; Fragmentation and extraction control; Subsidence associated; Advantages and Disadvantages of Block Caving
In this ppt you will get all information regarding shaft sinking. Like what is permanent lining and temporary lining. How to decide shape of shaft, drilling blasting, support, lighting in shaft. Use of shaft and skips.
Dense Medium Separation is Gravity Separation Method in Mineral Processing. It is widely used in coal cleaning technology and Coal preparation and in other ores like lead, zinc, manganese, fluorspar, diamond.
The mineral reserves & reserves estimation using triangular methods Numan Hossain
It includes the introduction about mineral reserves. It also introducing triangular method to estimate the mineral reserves. Here after solving related problems some relevant problems are introduced for practice.Hope, it will be helpful who wants to estimate ore reserves using triangular methods. Here, the differences between probable and proven reserves also displayed.
Longwall; Longwall in coal; Longwall in Hard Rock; Sublevel Caving; Characteristics of the ore body and mining method; Development; Production; Equipments Used; Block Caving, Introduction, Historical evolution of the method, Condition deposit; Principles of the method; Methodology of block caving; Basic issues of geomechanical to the black caving method; Caveability;Mine design Block caving; Fragmentation and extraction control; Subsidence associated; Advantages and Disadvantages of Block Caving
In this ppt you will get all information regarding shaft sinking. Like what is permanent lining and temporary lining. How to decide shape of shaft, drilling blasting, support, lighting in shaft. Use of shaft and skips.
Dense Medium Separation is Gravity Separation Method in Mineral Processing. It is widely used in coal cleaning technology and Coal preparation and in other ores like lead, zinc, manganese, fluorspar, diamond.
Criteria for selection of Board and pillar for multiple seamsAsim kumar Satapathy
So the main purpose of this project is to focus on the selection criteria of Bord and Pillar workings without compromising the safety factor in multiple seam.
Jamalganj Coal field is the largest underground coal deposit placed in Jaypurhat district. I tried to include some information about the coal field. I made the slide for my course presentation purpose.
COAL Union of Concerned ScientistsContents· How Coal Was.docxclarebernice
COAL: Union of Concerned Scientists
Contents
· How Coal Was Formed
· How Coal is Mined
· Where Our Coal Comes From
· How Coal is Transported and Processed
· How Coal is Burned
· Environmental and Public Health Impacts of Coal
· The Future of Coal
Many people think coal represents a bygone way of life and that America has moved on to safer and cleaner energy sources. On the contrary, coal provides roughly half the nation’s electricity—far more than any other source of power—and our coal use has nearly tripled since 1960. Our coal use will continue to expand if the power industry succeeds in building the many power plants it has proposed for construction.
Coal’s proponents claim coal power is cheap. While the direct price of electricity from the nation’s aging fleet of coal plants may be low, it doesn’t reflect the staggering and lasting costs of coal-related air and water pollution, mining accidents, permanently altered landscapes, and, most importantly, climate change. Even the newest proposed plants – which would cost far more than existing plants—would have major impacts on air and water quality, and almost the same mining and climate impacts as existing plants.
Technology is evolving that has the potential to substantially reduce coal’s contribution to global warming by capturing carbon emissions before they are emitted. This technology could become an important part of the battle against global warming, but it remains to be seen whether it will work at a commercial scale and at what cost.
Meanwhile, a 2009 UCS study found that we can dramatically reduce our coal use—and all the environmental and social costs associated with it—while saving energy consumers money with policies that aggressively promote energy efficiency and renewable power.
How Coal Was Formed
Coal was formed when dead plant matter submerged in swamp environments was subjected to geological forces of heat and pressure over hundreds of millions of years. As time went by, the plant matter evolved from moist and low-carbon peat, to coal, which is much higher in energy and carbon content. Coal itself has a wide variation in properties, so it is categorized into 4 ranks—lignite, sub-bituminous, bituminous, and anthracite—in order of increasing carbon and energy content. Most of the coal burned in U.S. power plants is of the bituminous or subbituminous variety.
Figure 1: The Process of Coal Formation (Source: KGS)
Coal of all types can vary widely in the amount of sulfur contained. These differences are determined by the conditions under which the coal formed. Low-sulfur coal deposits formed in a freshwater environment, while those containing higher proportions of sulfur developed in brackish swamps or marine-influenced environments.[1] In the United States, the sulfur content of coal resources varies along geographic lines, with most of the eastern coal containing high levels of sulfur, and the younger western coal containing much less.
How Coal is Mined
In 2 ...
Open pit mining is the process of mining a near surface deposit by means of a surface pit excavated using one or more horizontal benches.
The term open pit mining is usually used for metallic or non-metallic deposits and sparingly used for bedded deposits like coal.
Coal Mines How and where are coal mines found in Chhattisgarh Basically, the coal mine of Vishrampur is shown in this, which is spread in its area of Bishrampur or South of Chhattisgarh.
There is coal mine in south east along with it there is also coal mine in Parsa Amira .
Coal mine is basically of 2 types open casting and underground coal mine. Coal mine of Vishrampur both type.
Both types of coal come under the category of mines, in which first open casting is done, after that the underground coal itself comes in different types of coal mines in different districts of Chhattisgarh. There is a coal mine, it has seen different types of uses such as in the food industry, in the cement industry, in the three industries, in the bauxite industry, in the sugarcane industry, as well as in the iron industry.
Coal There are four types of coal, which are shown in the following way in this article,
so you read and understand this article and how did you like it, definitely write in the comment thank you.
A study into the feasibility of application of longwall top coal caving (ltc...nasina balasubrahmayam
Longwall Top coal Caving is going to be the significant method of thick seam mining at higher depths in India. Limiting depth of present opencast mining is about 300m. In this paper concepts of LTCC were discussed for Indian application.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
2. Introduction
History of coal mining
Procedure for exploration of coal
Classification of coal mining methods
Latest techniques of coal mining
Factors influencing the choice of coal mining
methods
Conclusion
Reference
3. Coal Mining is the term that encompasses the physical extraction or
removal of coal from the Earth’s Surface.
When coal is used as fuel in power generation, it is referred to as
Steaming or Thermal coal while those which are used to create coke
for steel manufacturing is referred to as Coking or Metallurgical Coal.
Coal can be mined by both Surface and Underground Mining methods.
Surface mining is a form of mining in which the soil and the rock
covering the mineral deposits are removed. Surface mining carried out
when the deposits are found closer to the surface.
Underground mining is carried out when minerals deposits are located
at a distance far beneath the ground to be extracted with surface
mining.
4. In Wales there is archaeological evidence of using coal in funeral pyres in
bronze age, some 3000-4000 yrs ago.
Coal was mined in colonial America in the early 1700s and commercial
mining first occurred around 1730 in Midlothian, Virginia.
Coal cutting machine were invented in the 1880s. Before the invention,
coal was mined from underground with a pick and shovel.
In 1900 about 95% of the world’s commercial energy was derived from
coal, 4% from oil and gas and less than 1% from hydraulic sources.
With the advent of oil in the present century, the industrialized nations
of the world became more and more dependent on oil for their needs
and share of coal to meet the energy requirement felt down
considerably.
But the picture again changed after the energy crisis of 1973 which
resulted in the manifold increase in the price of petroleum leading to the
increased demand for coal.
5. Study the general topography of the area.
Look for the outcrop of the coal in the hillsides, roads or railway
cuttings, riverbeds. These features indicate the presence of coal
bearing strata.
Look for fossils, which help in determining the age of rocks and
also if coal is likely to exist in the area or not.
Reserve, structure and thickness of coal seams should be
estimated.
Various parameters regarding the purity and rank of the coal
should be tested. For example, calorific value, moisture
content, carbon content, hydrogen content, volatile content
and so on.
7. Surface MiningSurface Mining is used for about 40% of coal production in the world.
Ore bodies close to the surface at depths less than approximately 180 ft
(50 m), are usually surface mined. Coal that occurs at depth of 180 to
300 ft (50 to 100m) is usually deep mined but, surface mining
techniques can be used.
a). Strip Mining:a). Strip Mining:
It is one of the open cast mining methods with a high degree of
mechanization employing either power shovel or a combination of
dragline and power shovels for striping the overburden.
The overburden to coal ratio may be as low as 1:12 upto a depth of 30
or 50 ft or 1:15 where the overburden is about 90 ft.
If the overburden is very thin, being only a few feet and conditions are
favorable then stripping can be managed with bulldozers. In this
method single stripping shovels and single draglines are use to remove
coal. It is commonly practiced in the U.S.A.
9. b). Slice Mining:b). Slice Mining:
In slice mining method, a coal seam is divided into slices of suitable
thickness and individual slices are worked. The common types in slice
mining are inclined slicing, horizontal slicing and diagonal slicing. Slice
may be taken in both ascending order and descending order or in mixed
order.
10. c). Horizon Mining:c). Horizon Mining:
This method is adopted in case of very highly disturbed areas
where the coal measures have been folded and faulted.
It is the system of mining which consist of more than one level
and the coal seam are opened up by the level roads driven in the
rock.
This method can be employed with advantage in highly disturbed
areas where a no. of coal seam is known to occur.
It is commonly practiced in Germany, France and Belgium.
11. Deep Underground Mining is needed when coal seams are found too
deep underground. 60% of the world coal production is mined by
underground mining method. Bord and Pillar method, Longwall method
and short wall method are the most commonly used mining method.
1). Bord and Pillar method:1). Bord and Pillar method:
The Bord and Pillar method of mining coal seam involve the driving of a
series of narrow heading in the seams parallel to each other. These
headings are connected by cross headings so as to form pillars for
subsequent extraction either partially or completely.
Ideally the pillar should be square but they are sometimes rectangular or
of rhombus shape and the galleries surrounding the pillars are invariably
of square cross section. The method is best suited to work flat coal
seams of 1.8 to 3 m thickness at shallow depth.
12. 2. Longwall Method:2. Longwall Method:
There are two types of long wall methods of mining.
a). Longwall Advancing:a). Longwall Advancing:
It involves the extraction of panel of coal to be worked by advancing the
face forward on a wide front leaving behind the roadways serving it.
Fig. Longwall Method
GOAF
Direction of Advancing
F
A
C
E
13. b). Longwall retreating:b). Longwall retreating:
In case of longwall retreating, the face is retreated
on the roadways driven before opening out the face
and as the face is retreated backwards, the Goaf is
allowed to cave in or it is filled and gate roadway is
lost in the Goaf.
This method can be employed almost in all
geological conditions, though it is eminently suited
for working thinner seams.
In India, the first longwall face was operated at
Narsumuda colliery around 1880 in Raniganj coal
field.
3). Short wall method:3). Short wall method:
This is variant of longwall and bord and pillar method in which the length of
face is much smaller than normal with longwall mining and the short wall was
developed to employed the usual room and pillar equipment but with
geometric simplicity and advantages of self advancing hydraulic roof support.
This method incorporates the advantage and disadvantage of both board and
pillar method and longwall method.
F
A
C
E
GOAF
Direction of Retreat
Fig. Longwall Retreating
14. 3. Miscellaneous Methods:3. Miscellaneous Methods:
a). Hydraulic mining of coal:a). Hydraulic mining of coal:
Hydraulic mining of coal comprises two operations. They are hydraulic cutting of
coal from seam and hydraulic transport of the resultant mixture of coal and water
from the mined.
Coal is broken down by a high pressure water jet against the face, the pressure
being increased or decrease according to the hardness of the seam. The minimum
pressure Pef
necessary for effective breaking down of coal ranges from 10 to 20 MN
and water discharged from 200 to 500 m3
/hr depending on the coal conditions and
coal hardness. Hydraulic transport of broken coal is done in three ways, they are
1. Along the floor1. Along the floor
2. In flumes2. In flumes
3. In pipe ranges3. In pipe ranges
15. Extended application of open cast mining method, long wall mining
methods, particularly advanced technology mining (ATM) faces and
automations.
Increased level of mechanization and adaptation of various technique
of thick seam mining developed abroad.
Hydraulic Mining Methods
Underground Gasification of Coal
Evolution of suitable techniques for the control of strata and
subsidence and for the protection of environment
Increasing application of computer in mine planning and mining
operations.
16. Thickness and Gradient of the seam
Depth of the seam
Structure and geological abnormalities
Mechanical properties of the coal
Characteristics of roof and floor
Gas content of the coal seam
Hydrogeological conditions of the coal measures.
Availability of machines for mechanizations and development in
technology.
17. Coal is mainly formed by the deposition of plants remains on the
earth’s surface being subjected to several geological processes over
a period of time.
Mining of coal has been started thousands of years ago. The first
published, reference to the mining of coal in India dates back to the
year 1774 in the Raniganj Coal Field.
Coal mining methods can be broadly divided into two types viz.
Surface Mining Methods and Underground Mining Method.
The Indian coal industry is the world’s third largest in terms of
production and fourth largest in terms of reserves.
Top coal producing states of India are Orissa, Chhattisgarh,
Jharkhand and other states can be named are Maharashtra, West
Bengal, Tamil Nadu.
18. Books:Books:
i). R.D. Singh (1997), “Principles and Practices of Modern Coal Mining”,
Page No. (142-143), (149- 155), 206, (343-347), (367-368).
New Age International (P) Ltd.
ii). R.N.P Arogyaswamy (1996), “Courses in Mining Geology”,
Page No.( 395-412), 4th
Edition,
Oxford and IBH Publishing Co. Pvt. Ltd.
Websites:Websites:
i). www.wikipedia.com
ii). www.britannica.com
iii). www.coaleducation.org