1. PRESENTATION
ON
Highwall Mining
I. Satyanarayana, M.Tech,MBA,MCA
Dy. Manager, Project Planning, SCCL,
isnindian@gmail.com,
visit at
www.slideshare.com/isnindian

2. High Wall Mining Technology
• Highwall Mining is a remotely controlled mining method, which
extracts coal from the face of a coal seam under a highwall in a
surface mine, which has reached the final highwall position due to
uneconomic stripping ratios Or due to local constraints which limit
further surface mining.
• The coal left in the High wall can be extracted by this technology
which otherwise would be lost for ever
• SCCL is the 1st company implementing this technology in India
• The following mines are identified for extraction of coal from the
Highwall by using this technology
• RG OC II Extension (already extracted)
• RG OC I Expansion
• Medapalli OC Expansion
• Koyagudem OC II

3. Highwall Mining Technology:
• This method relies upon the self supporting capacity of the strata
above the series of parallel entries driven mechanically to a
considerable depth without artificial roof support and ventilation in
the seam horizon.
• This technology provides an economical way to extract coal reserves
locked up in the highwall.
• The extent of an opencast project is limited by the financial viability,
though coal seam continues to exist beyond the quarry limits.
• Non-replenishable coal is getting lost forever within the highwalls of
the opencast projects.
• This technology is being practiced in USA, Australia and Indonesia
• Limiting gradient – 1 in 3.5 and maximum penetrating depth (in level
gradient) is around 500 m

4. HIGH WALL MINING

5. Highwall Mining system

6. Highwall Mining system
Video

7. High wall Mining Technology

8. High wall Mining Technology – Auger Type
• Consisting of single or dual cutting heads with coal being cleared
by spiraled flights, creating circular entries

9. High wall Mining Technology – Auger Type
DUAL HEAD AUGER

10. Highwall Mining Methods -
Continuous Highwall Miner (CHM)
Consisting of a remotely operated continuous miner followed by a series
of material transfer cars, creating rectangular entries

11. PUNCH LONGWALL