Open-pit mining is used when coal is located deeper underground. A pit, sometimes called a borrow, is dug in an area. This pit becomes the open-pit mine, sometimes called a quarry.
Which technique is used to take out coal?
The most economical method of coal extraction for surface mines is the electric shovel or drag line . The most economical form of underground mining is the long wall, which is a shear blade that runs along sections of the coal seam.
Which type of mine may be used to remove coal from a coal seam deep underground open pit mine strip mine subsurface mine none of the above?
Open-pit mining is used when coal is located deeper underground. A pit, sometimes called a borrow, is dug in an area. This pit becomes the open-pit mine, sometimes called a quarry.
What are the 4 types of mining?
There are four main mining methods: underground, open surface (pit), placer, and in-situ mining . Underground mines are more expensive and are often used to reach deeper deposits.
What are the 3 types of mining?
Open-pit, underwater, and underground mining . These are the three main methods of mining we use to extract our products from the ground.
Is surface or subsurface mining worse?
Subsurface mining is actually less disruptive to the earth and produces less waste than surface mining, but it’s also much less effective and more dangerous . Many workers die in mine collapses, which then also leaves behind a large hole from caving in of the ground above.
Why is strip mining bad?
Strip mining presents many different problems, including the destruction of ecosystems through removal of vegetation and dumping into streams (such as in mountaintop removal mining), problems with blasting damage and noise pollution, flooding, the extreme hazards presented by the impoundment of wastes generated from ...
What are 3 advantages of coal?
- It is available in an abundant supply. ...
- It has a high load factor. ...
- Coal offers a rather low capital investment. ...
- Carbon capture and storage technologies can reduce potential emissions. ...
- It can be converted into different formats. ...
- Coal can be used with renewables to reduce emissions.
What are disadvantages of coal?
- Coal is nonrenewable. ...
- Coal contains the most CO2 per BTU, the largest contributor to global warming.
- Severe environmental, social and health and safety impacts of coal mining.
- Devastation of environment around coal mines.
- High cost of transporting coal to centralized power plants.
What are two methods of removing coal from deposits?
Coal miners use two primary methods to remove coal
In surface mining, large machines remove the topsoil and layers of rock known as overburden to expose coal seams. Mountaintop removal is a form of surface mining where the tops of mountains are dynamited and removed to access coal seams.
What is difference between mining and quarrying?
Mining is the process of extracting buried material below the earth surface. Quarrying refers to extracting materials directly from the surface. In mining and quarrying, water is used and gets polluted in a range of activities, including mineral processing , dust suppression, and slurry transport.
What are the 5 methods of mining?
There are five recognized types of surface mining, each with specific variations depending on the minerals being extracted. These include strip mining, open-pit mining, mountaintop removal, dredging and highwall mining .
Which are two main techniques of mining?
Primarily, there are two types of mining methods being used for the extraction of minerals and ores – surface/opencast mining and underground mining .
Why is a mine called a mine?
A mine is an explosive placed underground or underwater that explodes when disturbed, or when remotely triggered. The term originated from the use of mining to go under the enemy’s city walls .
What type of activity is mining?
Mining is the extraction of valuable minerals or other geological materials from the Earth , usually from an ore body, lode, vein, seam, reef, or placer deposit. These deposits form a mineralized commodity that is of economic interest to the miner.
