What is open pit coal mining?

What is open-pit mining? Open-pit mining, also known as opencast mining, is a surface mining technique that extracts minerals from an open pit in the ground. … This surface mining technique is used when mineral or ore deposits are found relatively close to the surface of the earth.

Can coal be found in open pits?

Open-pit mine [16]. Surface mining is usually used to develop coal seams and deposits of many other minerals, but their feasibilities vary with the nature of the body ore.

What is an open pit mine used for?

Open pit mining is a technique used to extract copper ore near the earth’s surface. Open pit mining is the most widely used technique of mining copper today. It is accomplished by creating and using benches or terraces to gradually reach deeper under the earth’s surface.

Why is open pit mining bad?

Open-pit gold mining is one of the highest potential mining threats on the environment as it affects the air and water chemistry. The exposed dust may be toxic or radioactive, making it a health concern for the workers and the surrounding communities.

Why is open pit mining cheaper?

Open-pit mining occurs on surface and is generally the cheapest way to extract ore. This is because rock doesn’t have to be moved far up hill against gravity, equipment used can be larger than underground, and it doesn’t require more expensive features like ventilation, communications, etc.

Is open pit mining safe?

Open-pit mining is much safer than shaft mining. In underground mining, the threat of a cave-in or release of toxic gas is a constant concern. When shaft mining was the most common method of ore extraction, thousands died in cave-ins, gas events and accidents involving equipment.

Where is open pit mining done?

Open-pit mines are used when deposits of commercially useful minerals or rocks are found near the surface; that is, where the overburden (surface material covering the valuable deposit) is relatively thin or the material of interest is structurally unsuitable for tunneling (as would be the case for sand, cinder, and …

What is the difference between an open pit mine?

A quarry is the same thing as an open-pit mine from which minerals are extracted. The only trivial difference between the two is that open-pit mines that produce building materials and dimension stone are commonly referred to as quarries.

What is open pit mining Class 10?

Open Pit Mine. Quarry. Underground Mine with Shafts. Minerals are removed from a pot dug in the ground. Minerals are removed from a shallow pit dug in the ground.

How are open pit mines dug?

Open Cut. Open cut (or open pit) mining involves digging and/or drilling and blasting to remove the resource or ore for processing. Often there is ‘overburden’ or waste rock material, which must be removed before the actual resource can be mined. … It is commonly used in shallow, near surface coal and mineral mines.

What are 4 types of mining?

The American Geosciences web site defines four main mining methods: underground, open surface (pit), placer, and in-situ mining.

How deep can Underground mining go?

Undergrounds coal mines can drive 2,500 feet (750 meters) into the Earth and other types even deeper — uranium mines can reach 6,500 feet, or 2 kilometers. But those depths are extreme; most top (or bottom) out at about 1,000 feet (300 meters) [sources: Times Wire, ARMZ, Illinois Coal Association].

What is the dirtiest type of mining?

The Nation’s Top Polluter According to the U.S. Environmental Protection Agency’s Toxics Release Inventory, metal mining is the nation’s #1 toxic polluter.

Is open-pit mining good for the environment?

This type of mining is particularly damaging to the environment because strategic minerals are often only available in small concentrations, which increases the amount of ore needed to be mined. Environmental hazards are present during every step of the open-pit mining process.

How is coal extracted from an open cast mine?

Open-pit mines use draglines, as well as truck and shovel operations to extract coal. A dragline excavator uses a dragline to pull a bucket by a wire cable. The operator lowers the bucket down to the coal deposit to be excavated.

What are the disadvantages of open mining?

1.1 Features, technical and economic indicators of open pit development

Advantages Disadvantages
High production rate (essentially unlimited, although small surface mines also possible) Limited by stripping ratio
Lowest cost along with open cast mining High capital investment associated with large equipment

What is the most expensive mining method?

Underground mines Underground mines are more expensive and are often used to reach deeper deposits. Surface mines are typically used for more shallow and less valuable deposits. Placer mining is used to sift out valuable metals from sediments in river channels, beach sands, or other environments.

Why is open-pit mining good?

Advantages of open-pit mining include: Powerful trucks and shovels can be used to move large volumes of rock. Equipment not restricted by the size of the opening you are working in. Faster production. Lower cost to mine means lower grades of ore are economic to mine.

How does open-pit mining affect human health?

Mine dusts in ambient air are generally above allowable limits. Prolong exposure to these dusts by miners could lead to respiratory diseases (asthma, silicosis and tuberculosis) and skin disorders.

How deep is the deepest open pit mine?

1.2km deep The Bingham Canyon Mine, also known as the Kennecott Copper Mine, is in the US state of Utah. Originally discovered by Mormon pioneers in the 1800s, it is the deepest open pit mine in the world at over 1.2km deep and covering an area of 7.7km2 (visible from outer-space).

Where is the biggest open pit mine?

Bingham Canyon Mine Bingham Canyon Mine, located near Salt Lake City, is the world’s deepest man-made open pit excavation. The mine is 2.75 miles (4,5km) across and 0.75 mile (1,2km) deep.

What is the largest open pit mine?

Bingham Canyon Mine The Bingham Canyon Mine, more commonly known as Kennecott Copper Mine among locals, is an open-pit mining operation extracting a large porphyry copper deposit southwest of Salt Lake City, Utah, in the Oquirrh Mountains. … Bingham Canyon Mine.

Location
Type Open-pit
History
Discovered 1848
Opened 1906

Which is one of the deepest gold mine of the world?

Mponeng gold mine The Mponeng gold mine located in the Gauteng province of South Africa, is the deepest operating mine in the world.

What is Open cast mining Class 8?

Open Cast Mining: When minerals are taken out by removing the surface layer, the process is called open-cast mining. Minerals which lie at shallow depths are extracted by this process. … Quarrying: When minerals are simply dug out from near the surface, the process is called quarrying.