1. Development and extraction
of coal pillar by continuous
miner technology
SUBMITTED BY-
SHUBHAM AGARWAL
B. Tech in mining engineering
ISM Dhanbad
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2. OBJECTIVE:-
1.Development of coal pillars by
continuous miner technology
2.Extraction of coal pillars by continuous
miner technology
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3. Coal mining –
The goal of coal mining is to economically
remove coal from the ground. Coal is valued
for its energy content, and since the 1880s is
widely used to generate electricity.
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4. Pillar- A block of coal left behind in a coal seam to aid support
of the overlying strata. Pillars may be needed to prevent
excessive subsidence on the ground surface or to avoid
excessive geological distortions in the mine workings. For
example - a pillar is usually left between two panels of coal
being extracted by longwall mining.
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5. DEFINITIONS:
Pillar boss: In bituminous coal mining, a person who supervises the work of
robbers in removing pillars of coal that were left to support the roof of
working places during mining operations.
Pillar robber: In anthracite and bituminous coal mining, one who breaks down
and rips out with a pick, pillars of coal left to support the roof in rooms when
the usual mining was being done.
Pillar man: A person who builds stone packs in mine workings.
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6. ROOM AND PILLAR MINING-
This drawing depicts the room and
pillar method of underground
mining. Most underground coal is
mined by the room and pillar
method, whereby rooms are cut
into the coal bed leaving a series of
pillars, or columns of coal, to help
support the mine roof and control
the flow of air.
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7. DEVELOPMENT OF PILLARS-
Room and pillar mining is defined by the fact
that portions of the coal seam being extracted
are left in place to support the roof of the
mine. Room and pillar mines are developed by
using machinery to extract the coal seam in a
grid like pattern through the development of a
parallel series of extraction areas referred to as
entries.
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8. Types of pillar mining-
1. conventional mining
2. continuous mining
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9. Conventional mining-
Conventional mining is the oldest method.
In conventional mining, the coal seam is
cut, drilled, blasted and then loaded into
cars.
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10. Continuous mining –
Continuous mining is the most prevalent form
of underground mining. In continuous mining,
a machine known as a continuous miner cuts
the coal from the mining face, obviating the
need for drilling and blasting.
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11. Continuous miner-
A machine with a large rotating steel drum
equipped with tungsten carbide teeth that
scrape coal from the seam.
The JOY continuous miner product line has
been developed to meet the high productivity
requirements of today's underground mining
industry.
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12. CONTINUOUS MINER
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13. Types available in the market–
The continuous miner product range is segmented by mining
height requirements into three machine classes for low,
medium and high-seam applications.
14CM Series Continuous Miners
12CM Series Continuous Miners
12HM Series Continuous Miners
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14. Main parts of a Continuous Miner-
• CUTTER
• GATHERING HEAD
• CONVEYOR
• TRACTION
• DUST COLLECTOR
• MANIFOLD HYDRAULICS
• ELECTRICAL CIRCUITS
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15. PILLAR EXTRACTION USING CONTINUOUS
MINERS
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16. The continuous miner has a large rotating steel
drum equipped with tungsten carbide teeth that
cut coal from the seam.
These machines are designed to remove coal
from the seam and to load it into shuttle cars and
then conveyor belts in a continuous process.
This allows the coal to be rapidly removed from
the working area and transported to the surface.
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17. Thank you
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