Design For Accessibility: Getting it right from the start
longwall mining
1. M.B.M. ENGINEERING COLLEGE,JODHPUR
DEPARTMENT OF MINING ENGINEERING
LONG WALL MINING
METHOD
PRESENTED BY- PRAKASH SUTHAR
TEAMMATES- PRADEEP SINGH RATHORE
PRAKASH VISHNOI
PRIYANSHU
RAMSWAROOP
2. CONTENTS FOR LONGWALL
INTRODUCTION
EQUIPMENT
MACHINERY USE IN LONG WALL
ADVANTAGE
DISADVANTAGE
REASON FOR SLOW PROGRESS OF LONGWALL IN INDIA
PRESENT ACTION AND FUTURE NEEDS
CONCLUSIONS
3. INTRODUCTION
This is a form of underground coal mining where a longwall of coal is mined in
a single slice (Typically 0.6m -1.0m thick).
Longwall panel is typically 3-4 km long and 250-400m wide.
As a cut or slice is taken along the length of the wall.
4. EQUIPMENTS
o Powered support system
o Shearer
o Armoured face conveyor
o Conveyor system
o Electricals & communications
7. ADVANTAGE OF LONG WALL MINING
o High recovery
o Lower operating cost
o Easier to supervise
o Increased safety
o Higher quantity of coal
o Suitable for thick seam
o Simple ventilation
o Better for deep seated mines
8. DISADVANTAGE OF LONGWALL MINING
o Small problem = Big production losses.
o Dust control difficult.
o Overloading conveyor system.
9. REASON FOR SLOW PROGRESS OF
LONGWALL IN INDIA.
o Long wall had to co-exist with the conventional mining in most
of the mines ,which caused management problem.
o Coal companies were sensitive to the failure of a few long wall
faces and were prepared to risk huge investments.
o Geological and geotechnical condition were more difficult then
expected.
o Problems in the maintenance of the equipment.
o Equipment sourced from many suppliers with no accountability.
10. PERSENT ACTION AND FUTURE
NEEDS.
o Spare parts of management.
o Workshops and overhauling facilities.
o Manpower development.
o Indigenisation.
o Monitoring of performance.
11. CONCLUSIONS.
o Mechanised longwall mining has emerged as the most
successful production technology in the global coal mining
scenario.
o Introduction of fully mechanised longwall technology was
made in China and India almost simultaneously.
