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why are coal mines deep inside the earth

Why are coal mines found deep inside the Earth? Quora

Nov 17, 2019· The reason coal is formed deep (ambiguous) inside the earth’s crust has a lot to do with the way coal is formed. Coal is formed by accumulation of vegetative material, which due to time, pressure, and heat decompose from their complex organic mole...

How does one go inside an underground coal mine?Nov 08, 2019Are coal mines cold?Apr 12, 2019Why do coal and petroleum have to be mined from deepJan 09, 2019查看更多结果

Why are coal mines deep inside the earth? Answers

问:Why are coal mines deep inside the earth?答:because coal is deep inside the earth查看有关answers的更多信息

Coal National Geographic Society

Dec 22, 2012· Underground mining, sometimes called deep mining, is a process that retrieves coal from deep below the Earth’s surface—sometimes as far as 300 meters (1,000 feet). Miners travel by elevator down a mine shaft to reach the depths of the mine, and operate heavy machinery that extracts the coal and moves it above ground.

Opportunities and Challenges in Deep Mining: A Brief

Aug 01, 2017· Since the exploitation of the earth’s resources has a long history, coal and mineral resources at shallow depths have gradually become exhausted, and the exploitation of coal and mineral resources continues ever deeper into the earth. At present, deep mining at 1000 m is normal; the depth of coal mines has reached 1500 m, the depth of

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How did coal get so deep inside earth? Answers

Deep inside Earth rocks are hotter and softer, so they will deform in a ductile manner, stretching and flowing like taffy. Coal mining is a dangerous job in the coal mines, as you see by the

12 Environmental Effects of Coal Mining Environment 911

Climate Change. High levels of methane, a potent greenhouse gas, is released during the mining

The Temperature Of The Earth As Shown By Deep Mines

At a recent meeting of the American Society of Civil Engineers, observations on the temperature of the earth, as shown by deep mines, were presented by Messrs. Hamilton Smith, Jr., and Edward B Dorsey. Mr. Smith said that the temperature of the earth varies very greatly at different localities and in different geological formations.

Why is the air temperature very hot in deep mines? Yahoo

Aug 25, 2010· The core of the Earth is around 6000 degrees celcius, about halfway to the core is about 3000, and so on. It should make sense then, that when you go very deep within the crust, where deep mines are located, it gets hotter. The gradient is something like 25 or 30 degrees celcius per kilometer you go within the Earth. Hope this was helpful.

Nation's Deepest Coal Mine Now Ranks Among Deadliest

Sep 26, 2001· The mine operator spends up to a year removing methane before the tunnels are dug, then extracts more just ahead of the mining machine and again after the coal has been removed.

12 Environmental Effects of Coal Mining Environment 911

Coal is either extracted from deep inside the earth or removed from its surface. The former is known as underground mining, the latter as strip mining or mountaintop removal. Either process contributes a high level of damage to the environment: #12 Noise pollution. One of the most obvious (albeit perhaps least harmful) environmental effects of

What Is the Environmental Impact of Mining and Burning Coal?

Surface coal mining damages the environment. Mountaintop removal mining is used to access layers of coal buried deep within mountains. This mining technique alters the landscape and damages ecosystems. Because coal is so abundant and relatively inexpensive, many people are reluctant to give it up as a fuel source.

Coal mining Wikipedia

Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine is a 'pit', and

The Temperature Of The Earth As Shown By Deep Mines

At a recent meeting of the American Society of Civil Engineers, observations on the temperature of the earth, as shown by deep mines, were presented by Messrs. Hamilton Smith, Jr., and Edward B Dorsey. Mr. Smith said that the temperature of the earth varies very greatly at different localities and in different geological formations.

OOPArts Found in Coal and Stone: Is There an Explanation

Sep 28, 2018· According to the World Coal Association, the process responsible for the formation of coal began 360 to 290 million years ago. With this in mind, it would seem absolutely impossible for any human artifacts to be found within this ancient substance; but incredibly, many items have reportedly been found in such deposits, either buried inside the coal itself or found buried deep down within coal

The Actual Difference Between Surface and Underground Mining

As can be seen, surface mining is much more advantageous than its counterpart. However, when an outcropping ore body stretches deep inside the Earth, surface methods can be used to begin the mining operation, which then need to be continued further by underground mining.

How does one go inside an underground coal mine? Quora

Nov 09, 2019· There are many ways to go into an underground coal mine, and it totally depends on the geology and the size of the site. If you are a person, you would almost certainly be transferred to the underground by an elevator like structure where the pers...

Nation's Deepest Coal Mine Now Ranks Among Deadliest

Sep 26, 2001· The mine operator spends up to a year removing methane before the tunnels are dug, then extracts more just ahead of the mining machine and again after the coal has been removed.

Why underground mines cost higher compared to surface coal

Geographic landscape. Recall that it takes more time, pressure, and heat to form higher-ranked coal. This means higher-ranked coal is largely buried deeper in the Earth’s crust, while lower

Stuff in Coal Welcome to 6000years.org

There are mines where silver is dug. There are places where gold is refined. Men dig iron out of the ground and melt copper out of the stones. Men explore the deepest darkness. They search the depths of the earth and dig for rocks in the darkness. Food grows out of the earth, but underneath the same earth all is torn up and crushed.

Terrifying Facts About the World's Deepest Gold Mine

The mine is as deep as 10 Empire State Buildings, and its 236 miles of tunnels are longer than the New York subway.. Every day, 4,000 workers descend into the mine through elevators—or, as they

Stunning photos show what it's really like to work deep

Oct 06, 2019· In the US, coal mining is a shrinking industry. In 1923, there were about 883,000 coal miners; today there are about 53,000.; Working in coal mines is dangerous

why is coal mine is warm inside

Why is the air temperature very hot in deep mines? Yahoo. Aug 25, 2010· The geothermal gradient can make conditions in the super-deep mines uncomfortable, dangerous and deadly. Hot enough to spontaneously explode rocks or bend steel. The TauTona Gold Mine in South Africa is the deepest mine in the world, bottoming out at roughly 3.9 kilometers.

Earthquakes and mining how humans create seismic activity

Jun 21, 2012· The 1989 Newcastle earthquake has been attributed to deep coal mining in the region. In addition to leaving 13 people dead, more than 160 in