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- W68660055 abstract "The Bureau of Mines has conducted research to determine whether the total elapsed delay time for blasting bituminous coal in underground mines could be safely expanded beyond the present 500-ms limitation without igniting a methane or methane-coal dust atmosphere. The results indicated that the increase of total delay from 500 to 1,000 ms had no detectable effect on safety relative to incendivity as long as permissible practices were observed in all other aspects. Research was also conducted to evaluate the safety of 18-in hole spacing for delay blasting in coal relative to misfires." @default.
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- W68660055 date "1986-01-01" @default.
- W68660055 modified "2023-09-27" @default.
- W68660055 title "Short-delay blasting in underground coal mines. Information Circular/1986" @default.
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