Organisational Factors » LTA testing equipment

15Toe Amputation by Drill String

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Brief Description of Incident/Accident & Description of Consequences/Outcomes:

Toe amputation by drill string.

Identified Root Causes:

A contractor engaged in installing secondary roof support for a main gate roadway was carrying out a maintenance task on a track mounted drill rig when struck on the foot by the falling drill string. The drill string was held in the jaws of hydraulically operated "grippers" fell from the roof as the hydraulic pressure relaxed, resulting in the traumatic amputation of two small toes 4th and 5th digits, of the right foot.

Root & Contributing Cause(s):

LTA maintenance

Stated or Potential Consequence(s):

Potential Fatality

Serious Injury

Preventative/Recommended/Accepted Steps of Risk Mitigation, Points of Interest:

Conduct a risk assessment for maintenance tasks.

The following controls should be considered

Drill strings to be effectively retained or removed from the machine prior to any task taking place which may expose personnel to harm.

Stored pressure circuit configurations to be assessed to prevent re-occurrence. For instance, load lock valves to guard against circuit de-pressurisation.

Provision of a gauge in the circuit to allow the pressure to be monitored and the fault detected.


Queensland Government Department of Employment, Economic Development and Innovation (DEEDI)


Here are the results.


Reference Type:

Safety Alert #8

Mine Type:

Any Mine Type


Potential & Kinetik - Pressure





Australia, Queensland

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