What is open face mining?

Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, is a surface mining technique of extracting rock or minerals from the earth from an open-air pit, sometimes known as a borrow.

What is a coal face in mining?

the surface in a mine from which coal is cut.

What is open cut coal mining?

Open cut is sometimes referred to as ‘strip mining’. It is commonly used in shallow, near surface coal and mineral mines. It uses very large machinery (draglines, shovels, dump trucks) to move soil, extract coal or other minerals, and transport them for processing.

Why is open-cast mining bad for the environment?

Environmentally, open-pit mining is devastating. It consumes enormous amounts of water, heavily pollutes water and air, disfigures landscapes, and permanently destroys habitat. Even after pits are exhausted and sites are rehabilitated, the pit area retains elevated risks of erosion and flooding.

What does face mean in mining?

In mining, the face is the surface where the mining work is advancing. In surface mining it is commonly called pit face, in underground mining a common term is mine face.

Do coal miners still exist?

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 — miners have to deal with toxic gases, plus the threat of being crushed, drowned, or injured from fires and explosions. Some miners love it.

Why is open-cut mining good?

After the mineral deposits have been exposed, the area is drilled, fractured and the mineral extracted. This method has a high recovery rate when compared to the underground, as 90 percent of mineral deposits are recovered. Overall when compared to other methods, open-cut is much safer.

What are the advantages of open-cut mining?

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.

Why are men employed in open cast mine?

Answer. Males are mostly employed in open cast mines because they have more strength than females. They can work for more hours than female can.

Is open-pit mining the safest?

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.

What are the 4 main 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 is the top of a coal mine called?

The bank, pit bank or pit brow is the area at the top of the shaft. A banksman, banker, hillman or browman works at the pit bank to dispatch the coals, and organise the workforce.

Are coal miners well paid?

The salaries of Coal Miners in the US range from $11,105 to $294,800 , with a median salary of $53,905 . The middle 57% of Coal Miners makes between $53,905 and $133,947, with the top 86% making $294,800.

Do coal miners still get black lung?

Today, not only do coal miners still suffer from this lethal but preventable lung disease, they do so at younger ages, some even in their thirties, and they are contracting the most advanced form of black lung at the highest rates ever recorded.

What is a disadvantage of open-cut mining?

Open pit mining is used for the extraction of both metallic and nonmetallic ores….1.1 Features, technical and economic indicators of open pit development.

Advantages	Disadvantages
Lowest cost along with open cast mining	High capital investment associated with large equipment

What is meant by working face in coal mining?

Working- When a coal seam is being squeezed by pressure from roof and floor, it emits creaking noises and is said to be “working”. This often serves as a warning to the miners that additional support is needed. Working face- Any place in a mine where material is extracted during a mining cycle.

What is open-cut coal mining?

When coal seams are near the surface, it may be economical to extract the coal using open-cut (also referred to as open-cast, open-pit, mountaintop removal or strip) mining methods. Opencast coal mining recovers a greater proportion of the coal deposit than underground methods, as more of the coal seams in the strata may be exploited.

Where is open cast coal mined?

Most open cast mines in the United States extract bituminous coal. In Canada (BC), Australia and South Africa, open cast mining is used for both thermal and metallurgical coals. In New South Wales open casting for steam coal and anthracite is practiced.

What is face cleat in coal mining?

Face cleat- The principal cleavage plane or joint at right angles to the stratification of the coal seam. Face conveyor- Any conveyor used parallel to a working face which delivers coal into another conveyor or into a car. Factor of safety- The ratio of the ultimate breaking strength of the material to the force exerted against it.