About 30 homes were damaged by the water and slurry
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A mining company has explained what caused a lagoon to burst, sending a wall of mud through the village of Stoney Middleton.
About 30 homes were damaged when water and slurry flooded into the north Derbyshire village on Monday.
Glebe Mines said unprecedented high levels of rainfall led to a "sudden and totally unforeseen breach".
The firm, which had not commented until now, said it alerted the emergency services "at the earliest opportunity".
Insurers estimated the cost of cleaning up would probably run into hundreds of thousands of pounds.
Stoney Middleton school was closed all week and there were diversions around the village because the A623 was shut for safety reasons.