Document Type

Conference Paper

Publication Date


Publication Details

K. McTyer and T. Sutherland, The Duncan Method of Partial Pillar Extraction at Tasman Mine, 11th Underground Coal Operators' Conference, University of Wollongong & the Australasian Institute of Mining and Metallurgy, 2011, 8-15.


Mining commenced at Tasman Mine in late 2006. The current method of mining is bord andpillar using continuous miner-bolters and shuttle cars for first workings and secondary extraction usingbreaker line supports. The two stage process was chosen to accommodate irregular shaped coaldeposits, allowing adjustments to be made to extraction ratios for better management of subsidence andto maximise the efficiency of the operation. Following the completion of the first three full/partial extractionpanels a change in mining method was undertaken due to variable caving. The adopted partial extractionmethod involves stripping the developed square pillars on four-sides on retreat to leave a load-bearingremnant coal pillar. The system of partial extraction has been successful in delivering safety, productivityand subsidence targets.