Kimberley Diamonds has seen a wall slippage at its Ellendale mine.
During routine blasting at its E9 open pit yesterday some slippage of the pitwall happened underneath the main access ramp, temporarily rendering it unsafe for use.
Due to safety concerns mining operations have been suspended pending a review and repairs.
Luckily there were no workers in the mine during the blast, and no equipment was damaged.
Kimberley says it has enough surface stockpiles of ore to continue treatment plant operation for at least two months on high grade ores.
In addition to these stockpiles, it also has lower grade stockpiles that would ensure operations continue for at least another 12 months.
Meanwhile access to the Far East zone of the E9 open pit has been unaffected.
"The impact that this interruption will have on the continuing production is estimated to be minimal and we do not expect that it will have any negative impact on the company's financial results," the miner said in a statement.