What is continuous miner?
Definition of continuous miner : a machine that cuts and loads coal in one continuous operation.
What is long wall mining method?
longwall mining Longwall mining is an underground method of excavating coal from tabular deposits, as well as soft mineral deposits such as potash. Large rectangular blocks of coal are defined during the development stage of the mine and are then extracted in a single continuous operation.
What is the difference between room pillar and longwall?
Room-and-pillar mining generally is not economical at such depths because the very large pillars are required to support the roof, which significantly reduces the amount of coal that can be recovered. Longwall mining is well suited to deep coalbeds because there is no need to support the roof.
How long is a continuous miner?
These miners have maximum cutting heights ranging from 3.1 m (122 in) to 4.6 m (181 in). For thin- to mid-seams we have the CM200 Series – from the thin- seam CM210 with a minimum cutting height of 0.76 m (30 in) to the mid-seam CM240 for seams of up to 3.4 m (134 in).
What is long wall and short wall method?
For measuring the long wall and short wall the external out-to-out length of walls running in the longitudinal direction generally is considered as “long wall” while the in-to-in internal length of walls running in the transverse direction is called as “short wall” or “cross wall”.
What is bord and pillar method?
A system of mining in which the distinguishing feature is the winning of less than 50% coal on the first working. It is more an extension of the development work than mining. The second working is similar in principle to top slicing.
How does longwall mining compare to room and pillar mining?
Longwall has better resource recovery (about 80% compared with about 60% for room and pillar method), fewer roof support consumables are needed, higher volume coal clearance systems, minimal manual handling and safety of the miners is enhanced by the fact that they are always under the hydraulic roof supports when they …
Who made the continuous miner?
Joy Global
Cutting system 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.
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 |
How does a continuous miner work?
Continuous miner: Mining machine designed to remove coal from the face and to load that coal into cars or conveyors. Cutting: Operation of making openings across a coal seam. Cutting drum: Rotating drum with carbide teeth that cuts the coal from the seam.
What is the best continuous miner for coal mining?
Sandvik MC390 is a top-performing continuous miner designed for coal and potash mining in applications where space is limited and high cutting power is needed. MC350 Continuous miner Sandvik MC350 is a top-performing continuous miner designed for coal and potash mining in applications where space is limited and high cutting power is needed.
Can a continuous miner cut the full width of a road?
Some continuous miners (at one time almost all) could not cut the full roadway width in one pass but had to be moved backwards and forwards and from side to side in order to cut the full profile.
How does a coal mining machine work?
A loading mechanism to pick up cut coal and deliver it into the central part of the machine A conveying system, usually a chain conveyor running in a steel trough from front to rear of the miner