W. R. Grace and Company
Bonnie Lake Mine Hydrogen Sulfide Asphyxiation
Bartow, Polk County, Florida
June 4, 1975
No. Killed - 2
MESA Final Investigation Report 
More Double and Triple Fatality Mining Accidents
From the Google News Archives: 
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Victims were killed when they were overcome by hydrogen sulfide gas while placing flashboards near the bottom of a spillway decant tower.
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