The dust storm that has engulfed Ohio has sent mining companies scrambling to keep the mines safe.
The state has been hit hard by an increase in the number of dust storms that have been triggered by lightning strikes and avalanches, leaving some mines shut down.
The most recent dust storm struck at the end of June, causing the collapse of the mine shafts and the loss of about 300 workers.
The company, Geico, said it is still working to repair the shafts but expects to be back in operation later this month.
The Ohio Department of Natural Resources said Monday it is reviewing the incident to see if there are any new safety concerns.
The agency said it has received a total of 11 reports of dust storm-related injuries, including three deaths.
It has sent more than 500 people to local hospitals to treat injuries.
“It’s a very dangerous time,” said John Travaglini, the governor’s top safety official.
“We’re very much aware of the issue and we’re trying to figure out what the best way forward is.”
Geico said it will conduct a safety review.
“Our hearts go out to everyone affected by this,” said Geico spokesman Chris Williams.
“The company is working with the state and will be conducting an ongoing safety review.”
He said the company is still planning for the dust storm.
The dust is usually released by lightning.