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- Tasks and activities:
- Blasting
- Document types:
- Information Circulars
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1/1/1986 - Information CircularsResearch was conducted to determine whether the total elapsed delay time for blasting bituminous coal in underground coal mines could be safely expanded beyond the 500-ms limitation without igniting a methane or methane-coal dust atmosphere.
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Content source: National Institute for Occupational Safety and Health, Mining Program