AUSTAR IN BRIEF Owned and operated by Yancoal Australia. Better know for the introduction of the LTCC Longwall Face Mines the Greta Coal Seam. Development to date utilising 2x ABM20 and 1x ABM25 Continuous Miners. Austar Coal Mine
MINE OVERVIEW Austar Coal Mine CURRENT WORKINGS PROPOSED WORKINGS OLD ABANDONED WORKINGS A2 Maingate
A2 MAINGATE Total Block Length 1179m Design Pillar Dimensions of 100m x 35m Profile – 5m wide x 3.2m high Mining Horizon – 1.5 > 2m Coal Tops 2x ABM20 – Twin and Super Unit Austar Coal Mine
AUGER STEELS Austar Coal Mine The Auger Steel cleared the cuttings far more effectively then the standard Scroll Steel in sugary coal.
ZONE 1 – Floor Conditions Austar Coal Mine Water from the flooded workings immediately Up Dip of the A2 Maingate caused the soft mudstone floor to break up during wheeling.
FLANKING HOLES Drilled in advance of the Development Roadways to control the water seepage into the roadways. Repeat of the practise adopted for the A1 Maingate. Peak water make from some of the holes + 5 l/s. Austar Coal Mine A1 Flanking Holes A2 Flanking Holes
ZONE 1 – Floor Conditions Austar Coal Mine Skulls and Brattice
ZONE 2 Zone 2 –High Pressure Stress Zone –Cavities forming in front of the Miner –Face busting out 2m ahead of the cutter head and 2m above the Top of Coal Austar Coal Mine
MESHXPRESS PLATES Austar Coal Mine MESHXpress Plates used to pin the mesh to the spot bolts
Wyberex Bolts Austar Coal Mine Wyberex Bolts installed and PUR’d to form an artificial beam in the roof above the Dosco marker band. Bolts in the Rib angled out to reinforce the Rib inbye the face. 300mm x 300mm Pattern Dosco Band 4m Wyberex Bolt 2m Wyberex Bolt
Cavity Recovery Permit Permit System introduced due to the high risk nature of recovering the Cavities. Permit includes: –A minimum number skilled competent and experienced operators –The correct materials for the task Austar Coal Mine
ZONE 3 Zone 3 –Continuous Cavity forming between the face and the last line of support. Austar Coal Mine