united states mine rescue association Mine Disasters in the United States
Montana Ore Purchasing Company Cora Copper Mine Explosion
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.
Historical Summary of Mine Disasters in the United States - Volume III