Skip to main content
Conference Proceedings

2022 Open Pit Operators' Conference

Conference Proceedings

2022 Open Pit Operators' Conference

PDF Add to cart

Minimising coal damage and loss due to cast blasting

The main objective of the blasting phase in a coal mining operation is to maximise the coal recovery. However, coal loss due to blasting is a serious problem. The Australian Coal Association Research Programme (ACARP) reported in 2011 that in Australia one in every ten coalmines is completely wasted due to such losses. Coal is either lost in the spoil, largely due to the blasting operation or becomes diluted and cannot be recovered entirely. The major coal loss mechanisms include losses from the coal seam roof, the floor, the front edge and from dilution.The Australian coal mining industry has gone a long way towards addressing the coal loss issues since 2011 – almost all operations now deploy touch-coal drilling and sporadically use gamma logging for loading overburden. A study was conducted to compare the effectiveness of touch-coal information in which some touch-coal blastholes were drilled on a fixed or random pattern. In another study, some blastholes were drilled to the touch-coal, gamma-logged and mapped to determine stand-off distances. It was found that the coal roof surface created by gamma-logged holes was the most effective option for minimising coal loss. As a result, a variable stand-off distance was found to be the key to minimising losses.This paper discusses the importance of coal mapping, the rock properties of the roof and floor interface of the coal seam, and the significance of loading and initiating designs in minimising coal damage. Furthermore, the importance of using electronic initiators cannot be emphasised enough. This paper also discusses how a cast blast can be initiated from many locations by mitigating geological abnormalities and thereby avoiding spatial movement of rock shearing in a plane above the coal seam.
Return to parent product
  • Minimising coal damage and loss due to cast blasting
    PDF
    This product is exclusive to Digital library subscription
  • Minimising coal damage and loss due to cast blasting
    PDF
    Normal price $22.00
    Member price from $0.00
    Add to cart

    Fees above are GST inclusive

PD Hours
Approved activity
  • Published: 2022
  • Pages: 11
  • PDF Size: 1.632 Mb.
  • Unique ID: P-03028-T4M4B5

Our site uses cookies

We use these to improve your browser experience. By continuing to use the website you agree to the use of cookies.