The document provides information about highwall mining technology. It discusses how highwall mining can extract coal from the face of a coal seam under a highwall in a surface mine. It notes that SCCL is the first company implementing this technology in India at certain mines. Highwall mining provides an economical way to extract coal reserves locked in the highwall that would otherwise be lost. The technology involves driving parallel entries into the coal seam without artificial support using auger heads or continuous miners.

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