An explosion at the Massey Energy Co. mine in Montcoal, West Virginia, killed at least 25 miners. The cause of the explosion had not been determined as rescuers worked Tuesday to bore ventilation holes into the Upper Big Branch Mine. This is a chronological list of notable coal mine accidents in the United States over the last century. The list is not all-inclusive. * December 6, 1907 -- Worst coal mine disaster in U.S. history: 362 miners are killed in an explosion at the Monongah Nos. 6 and 8 Coal Mines in Monongah, West Virginia.
A criminal investigation should be opened into whether the operators of Utah's Crandall Canyon mine purposely misled safety officials about mine conditions before the deadly 2007 collapse, the chairman of a House investigation committee said Thursday.
A video camera that was lowered down a seventh hole Thursday in search of six coal miners trapped inside a mountain found only a few feet of clear space and piles of rubble and mud, federal officials said.
Crews searching for any sign of six miners trapped for more than three weeks are "hoping a miracle could happen," a federal official told lawmakers Wednesday, while another hole was drilled to insert a robotic camera into the mountain.
A robotic camera lowered into a mountain became stuck 10 feet from its target, forcing crews to come up with another route to attempt getting video of an area where six miners might be trapped, an official said Tuesday.
A sixth bore hole drilled into a space where six Utah miners were thought to be trapped found that the chamber contained no space where the men could have survived, an attorney representing some of the miners' families told CNN.