Shullsburg, Wisconsin February 10, 1943 No. Killed - 8
Eight men were killed in the worst mine accident in the long history of the Platteville lead-zinc mining district when the back of a low slope in the C. F. & H. Mine collapsed, burying the men.
Two of the victims were buried in an initial collapse, which occurred while they were preparing to shoot down a section of the rock suspected of being weak. Six others were buried in a second cave-in, which occurred while they were attempting to dig out the bodies of the first two men.
Source:
Historical Summary of Mine Disasters in the United States - Volume I