What is a continuous miner?

: a machine that cuts and loads coal in one continuous operation.

How much does a continuous miner cost?

EQUIPMENT OPERATING COST CALCULATIONS
PRODUCTION # UNITS TOTAL R&M
CONTINUOUS MINERS 2 $848.00
SHUTTLE CARS 4 $416.00
ROOF BOLTERS 2 $176.00

What is continuous mining method?

In a continuous operation, one machinethe continuous minerrips coal from the face and loads it directly into a hauling unit. In both methods, the exposed roof is supported after loading, usually by rock bolts.

How long is a continuous miner?

As the 12HM continuous miners are the largest manufactured by Joy Global, the cutting systems have been designed to match the machine mass. This series of miners is available with a chainless cutter head with drum diameters from 1118mm to 1320mm.

Where is continuous miner used?

Continuous miners cut and gather the material simultaneously and convey it into shuttle cars, haul trucks or a continuous haulage system. They are typically used for full-scale production in room-and-pillar mining operations.

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.

  • 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.

Who invented the continuous miner?

The first successful use of a continuous miner took place in 1943; the machine was built by the American Harold Silber. Joy acquired the patent for this continuous miner. In 1958, the first continuous miner was used in South African coal mining. In Europe, the first continuous miner were used in the 1960s.

What is bord and pillar mining method?

Bord-and-pillar mining comprises excavating boards and leaving a grid of pillars at predetermined intervals for stability purposes. These roadways are cleaned with LHDs that transfer the broken ore onto a conveyor belt system, which transports it to the surface rock handling facilities.

What is a coal cutter?

: a hand-manipulated but power-driven machine that is used to detach coal from the vein usually by sawing or drilling.

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What are the 3 methods 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. In this Digging Deeper article, we take a look at these different methods and provide a glimpse into what each involves.

What is coal used for?

Coal is primarily used as fuel to generate electric power in the United States. In coal-fired power plants, bituminous coal, subbituminous coal, or lignite is burned. The heat produced by the combustion of the coal is used to convert water into high-pressure steam, which drives a turbine, which produces electricity.

What tools are used to mine coal?

To understand the available options you have for machinery, here is a list of mining equipment used for surface or underground mining operations, plus their uses:

  • Large Mining Trucks. …
  • Hydraulic Mining Shovels. …
  • Large Dozers. …
  • Electric Rope Shovels. …
  • Rotary Drill Rigs and Rock Drills. …
  • Motor Graders. …
  • Large Wheel Loaders. …
  • Draglines.

What is joy miner?

[ji mnr] (mining engineering) A continuous miner weighing about 15 tons (13,600 kilograms) and made up of a turntable, a ripper bar, and a discharge boom conveyor; used mainly in coal headings and in extraction of coal pillars.

How much does a joy miner weigh?

145,000 lbs. Specifications for 12CM12

Cutter head design Solid head
Minimum cutting height *Without dust collector 55 in 59 in 85 in
Weight 145,000 lbs.
Ground pressure 31 psi
Ground clearance 12 in

What is the shuttle car?

A vehicle on rubber tires or continuous treads to transfer raw materials, such as coal and ore, from loading machines in trackless areas of a mine to the main transportation system. See Also: rubber-tired haulage, trackless tunneling.

How does a surface miner work?

Surface miner completely eliminates drilling blasting and primary crushing unit and thus reduces their associated environmental hazards. Apart from this, the sized excavated material increases the transport/conveying efficiency and thus saves the energy requirement in transportation.

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How does underground coal mining work?

Underground mining involves opening one or more portals or shafts into the earth that follow or intercept coal seams that are too deep for surface mining methods. … As the ‘room’ is mined, large ‘pillars’ of coal are left behind to support the weight of the overburden and rock layers above.

What is a roof bolter machine?

Bolting rigs (also called mining bolters) are specialized mining machines designed for drilling holes and installation of safety bolts in roof and walls of underground mining excavations.

What are the 2 main types of mining?

What are the main methods of mining?

  • 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.

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.

What’s the best type of mining?

Underground mining is best suited to extract minerals that are located deep under the surface of the earth. Common minerals extracted using underground mining include gold, lead and silver. It is important to remember that many minerals can be extracted using either surface or underground mining.

What was the first continuous mining machine?

The Joy Ripper The Joy Ripper (1948) was the first continuous miner applicable to the room-and-pillar method.

What is a longwall move?

Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.61.0 m (2 ft 0 in3 ft 3 in) thick). The longwall panel (the block of coal that is being mined) is typically 34 km (1.92.5 mi) long and 250400 m (8201,310 ft) wide.

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Who invented the coal machine?

Richard Sutcliffe (26 January 1849 23 July 1930) was an Irish mining engineer and inventor, active in England. He was born on a farm in Tipperary and worked at coal mines in Ireland between 1857 and 1885. He moved to Barnsley, England in August 1885. In 1892 he invented the world’s first coal cutting machine.

What is sublevel caving?

Sublevel caving (SLC) is a mass mining method in which the ore is drilled and blasted while the waste rock caves and fills the space created by the extraction of ore (Cokayne 1982. … The ore body is divided into vertical intervals called sublevel intervals.

What is Panel mining?

Panel – A coal mining block that generally comprises one operating unit.

What is a Bord in mining?

The word bord is not a misspelling of board, but a mining term for an underground space or room created to access the coal deposit. It originally meant a face of coal parallel to the natural fissures.

What are the various types of cuts given by coal cutting machine?

The coal cutting machine which are generally used to give either an undercut, middle cut, to cut or side cut for making a free face for efficient blasting operation are as follows: 1) Long wall coal cutters. 2) Short wall coal cutters. 3) Arc wall coal cutting.