A bench above an area containing compressor and generator began fretting. On inspection of the bench some significant cracks had appeared in the bench.
The area at the toe of the bench was immediately bunded and an exclusion zone put in place. Drainage was also installed on the bench to drain water away from the cracks.
Daily monitoring of the cracks has been put in place to identify potential failure.
It is critical that once identifying any cracks, rock falls or potential ground instability, monitoring/measurement of movement is put in place to identify any increase in movement that could indicate imminent failure.