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Mine Disasters in
the United States


Montana Ore Purchasing Company
Cora Copper Mine Explosion

Butte, Montana
May 12, 1905
No. Killed 7



Seven men were killed at this mine in an explosion.  It was reported that one of them was handling explosives in the magazine on the 1,500-foot level, when grease from the candle in his cap dropped into a box of explosives at his feet, causing it and three other boxes to explode.

Source:
Historical Summary of Mine Disasters in the United States - Volume III



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