This document discusses longwall mining, an underground coal mining method. It provides details on longwall mining equipment and operations. In India, longwall mining has faced challenges with low production rates. Issues included improper site selection, faulty planning, and support deficiencies. However, longwall mining is important for India's future coal needs as reserves suitable for open-cast mining are depleted and extraction moves to deeper horizons. Future needs include addressing geo-mining conditions, standardizing equipment, monitoring performance, and developing Indian longwall expertise.

1. Status in India and
its application for deep seated
deposits in international
scenario

2.  Longwall : Introduction
 LW mining equipments
 LW mining : Importance
 Status in India
 Analysis of the problem
 Present and Future

3.  This is a form of underground coal mining where
a long wall of coal is mined in a single slice
(typically 0.6–1.0 m thick).
 The Longwall panel (the block of coal that is
being mined) is typically 3–4 km long and 250–
400 m wide.
 As a cut or slice is taken along the length of the
wall, the supports are collapsed, advanced
closer to the face, and re-engaged, allowing roof
to cave behind.

6.  Powered Face Supports

7.  Shearer

8.  Armored Face Conveyor

11.  Present ratio of production:
UG : OC = 20 : 80
 The reserves suitable for OC mining are
gradually depleting.
 To meet the future coal demand we need
bulk production underground technologies.
 The present UG mines are operating at
depths of 350m and the future extraction is
from deeper horizons(300-600m).

12. Higher extraction
Increased safety
Higher Quality of coal
LW Mining
Suitable for thick seams Better for deep seated
mines

13. First mechanized powered support Longwall
caving face:
• August 1978 at Moonidih, CIL.
First Longwall face
• GDK 7 Incline in September 1983 in SCCL

14.  Indian
coal industry’s experience with LW has
been somewhat mixed .
 Between 1978 and 1987, nine LW packages
were deployed to extract some 5.4 million
tons of coal in Jharia, Raniganj, Satpura and
Godavari Valley coalfields.

15.  Theexperience from the first generation
Longwall faces was not encouraging.
 Average production at Moonidih was around 750 tpd
while Dhemo Main and Pathakhera gave around 550 tpd
 However, SCCL achieved around 1500 tpd .
 The production from about twelve operating mechanised
Longwall faces in India was just 1.15 million tons in
1993-1994
 utilisation factor of man and machine was within just
26%-35%.

16. Geo-mining Conditions
Improper Selection
Management of Face
Faulty Planning
ANALYSIS
OF THE
PROBLEM
Longwall Support
Selection Deficiencies Research needs
Large expansion in
opencast mining

17. Standardisation
Planning of Equipment
Monitoring of
Spare Parts PRESENT Performance
Management
ACTIONS AND
FUTURE
NEEDS
Workshops and Indigenisation
Overhauling Facilities
Manpower
Development

18. Thank You!