Breach of Road Bund

Mines safety alert no. Newsflash | 10 April 2019 | Version 1

What happened?

An incident occurred at an Open Cut Coal Mine where a truck has breached the bund and rolled over coming to rest below the road level. The Operator was not injured. The causation factors of the incident are yet be determined. Bunding is key in managing the risks associated with vehicles travelling over exposed edges

How did it happen?

Comments

Key issues

Recommendations

Things to Consider

Mines should review the size of bunding along exposed edges where a vertical drop-off exceeds 0.5m and develop appropriate edge protection considering the following:

  • The potential risk based on equipment used.
  • Vertical drop
  • Bund material used and drainage through bunds.
Below is an example of good practice design for bund construction:
  • Vertical drop greater than >5 metres require bunds 3metres high with a minimum   base width of 7 metres
  • Standard trapezoidal safety berms shall have a minimum height equal to or  greater than 50% of the tyre diameter of the largest vehicle regularly using the road (Refer to Figure 6 below)
  • Standard triangular safety berms shall have a minimum height equal to or greater than 66% of the tyre diameter of the largest vehicle regularly using the road (Refer to Figure 6 below)
  • The roadside facing batter angle of safety berms should be 45 degrees (1Vert. to 1Horiz.)

References and further information


Authorised by Peter Newman - Chief Inspector of Coal Mines
Contact: QldMinesInspectorate@rshq.qld.gov.au

Issued by Resources Safety & Health Queensland


Safety: This information is a guide only and is issued to promote safety through experience. It is not to be taken as a statement of law and must not be construed to waive or modify any legal obligation.; General: This information is a guide only. It is not to be taken as a statement of law and must not be construed to waive or modify any legal obligation.; Placement: Place this announcement on noticeboards and ensure all relevant people in your organisation receive a copy.

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