method of mining of coal

As one of the most popular methods of coal mining the surface technique consists of five main forms strip mining open-pit mining mountaintop removal dredging and highwall mining Room Pillar The room pillar method of coal mining consists of extracting the mineral across a horizontal plane creating a horizontal array of rooms and pillars

Dec 29 2016· Commonly coal mining methods are divided into two kinds open pit mining and underground mining Open pit mining or surface mining method is used when coal seam position near the surface While Underground mining is used when coal seam is far belo

Apr 13 2011· In the early years of coal mining primitive production methods meant individual workers owned and operated their own tools and were paid piece-wages according to the amount of coal mined

Surface mining is only economic when the coal seam is near the surface This method recovers a higher proportion of the coal deposit than underground mining as all coal seams are exploited - 90 or more of the coal can be recovered

Oct 23 2014· Caving Underground Mining Methods longwall Sublevel caving Block caving 1 This material is intended for use in lectures presentations and as handouts to students and is provided in Power point format so as to allow customization for the individual needs of course instructors

Jul 14 2009· Accounts for about 50 of coal production o Blast An older mining method that uses dynamite and explosives to break away the coal seam Accounts for less than 5 of coal production o Retreat Mining One of the most dangerous coal mining methods Pillars are used to hold up the mine roof as coal is extracted The pillars collapse as miners

Mining coal Coal miners use large machines to remove coal from the earth Many U S coal deposits called coal beds or seams are near the earth s surface while others are deep underground Modern mining methods allow coal miners to easily reach most of the nation s coal reserves and to produce about three times more coal in one hour than in 1978

Coal mining - Coal mining - Choosing a mining method The various methods of mining a coal seam can be classified under two headings surface mining and underground mining Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods and the choice of which method to use in extracting a coal seam depends on many …

Mar 08 2018· These surface mining methods are considered to be more efficient and economical in extracting minerals as compared to most methods of underground mining In fact it can extract almost 90 of ore from a deposit For this reason surface mining is the most widely used method …

An underground mine consists of the portals entrance and exits to the mines mains submains panels and working faces The panels are the working sections of the production operation Depending on the mining method a working section can have one or more working faces The mining activities that

The essential geomechanical features of longwall and caving methods of mining were outlined in Chapter 12 Longwall and caving methods are distinguished from other mining methods by …

Methods of Mining For more infomation about download this image please click here According to the Kentucky Department of Mines and Minerals 131 8 million tons of coal was mined in Kentucky in 2000 62 percent 81 million tons was from underground mines …

Nov 10 2017· Subject GEOLOGY Course ENERGY RESOURCES AND MINERAL EXPLORATIONS Keyword SWAYAMPRABHA

Apr 03 2017· 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

Apr 25 2018· Here in this video we have discussed different types of mining methods including coal mining methods - 1 Surface Mining - Opencast Mining Auger Mining Strip Mining Contour mining Highwall Mining

Mining the Coal Coal miners use giant machines to remove coal from the ground They use two methods surface or underground mining Many U S coal beds are very near the ground s surface and about two-thirds of coal production comes from surface mines

In any discussion of Methods of Underground Mining Comparison one is repeatedly confronted with the difficulty of dealing with so many variable conditions It is not an exact science and in the choice of a method each varying factor has a certain weight which in many cases experience alone can determine

The booklet discusses the environmental aspects of metal mining and illustrates the ways science and technology assist in preventing or reducing environmental impacts Coal Mining and Transportation Webpage U S Energy Information Administration Webpage describing different methods used for mining processing and transporting coal

In Alaska underground mining was the primary form of coal mining used until about the late 1930 s early 1940 s I was unable to find an exact date The method of surface mining was first recorded being used in the Healy River area where it is still in use by the Usibelli Coal Mine

Longwall Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground with room-and-pillar being the traditional method in the United States Both methods are well suited to extracting the relatively flat coalbeds or coal seams typical of the United States Although widely used in

Conventional mining is the oldest method and accounts for only about 12 of underground coal output In conventional mining the coal seam is cut drilled blasted and then loaded into cars Continuous mining is the most prevalent form of underground mining accounting for 56 of total underground production In continuous mining a machine

Mining Methods Development of Mining Methods The first method of mining coal from Kansas rocks was a primitive form of strip-mining which may be aptly termed crop-working Possibly the Indians were the first to employ this method of removing coal from the outcrop by means of crude hand implements

The underground mining methods we use include room and pillar narrow vein stoping and large-scale mechanised mining Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds We use this for mining coal

The underground mining methods we use include room and pillar narrow vein stoping and large-scale mechanised mining Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds We use this for mining coal

Mountaintop removal mining involves taking off the top of the mountain to reach the ore underneath and is usually associated with coal mining Most surface mines only extend to about 650 feet after which the underground mining method is used

Surface Coal Mining Methods in Australia 5 2 Open cut mining methods strip mining Large-scale open cut coal mining operations commenced in Australia in mid 1960s and since then there has been significan t developments in this method of mining The mines are now operating at significantly higher annual tonnages growing deeper more complex and

The Mining Process Once a mining lease has been awarded to an operator exploration i e evaluation of the resource takes place followed by a planning and development process before excavation or mining …

Coal mining extraction of coal deposits from the surface of Earth and from underground Coal is the most abundant fossil fuel on Earth Its predominant use has always been for producing heat energy It was the basic energy source that fueled the Industrial Revolution of the 18th and 19th

The methods of mining of coal varies from deposit to deposit This report highlights the coal mining methods their significances issues of concern and the stages of using coal after mining

Early Mining Methods - History of Coal Mining Feb 3rd 2016 Before coal mining wood was the main source of fuel Wood provided good levels of heat when in the form of charcoal but to fuel the industrial revolution this wasn t enough Let us take you on a journey through early mining methods