Outburst

Question 1

What is the definition of an outburst?

Answer 1

A Violent ejection of coal and an expulsion of large volume of noxious and/or flammable gas from a working face area

Question 2

What are the Outburst Indicators you should know?

Answer 2

Structural Indicators
- Presence of Structures or Faults
- Presence of Dykes
- Presence of Calcite and/or mylonite

Risk Related Indicators
- Sudden Deterioration of Strata – Roof and/or Ribs
- Presence of Slickensides
- Chemicals being blown out of drill holes
- Increase or decrease in bumping
- Increase or Decrease in Gas emission/ Gas Pressure
- Increase or Decrease in Water make at Face
- Presence of Slickensides
Oh No Indicators
- Face Spitting
- Face Movement and/or Seam Separation Events
- Conical Structures in Face