Back yard blasting on the quiet

Journal Article · Wed Jun 01 00:00:00 EDT 1983 · Coal Age; (United States)

OSTI ID:5237325

Chironis, N P

When R and F Coal Company of Ohio ''sweeps out the corners'' of many of its old sites, it often blasts ''literally in some family's back yard.'' Sequential blasting patterns allow for such work without unduly disturbing the residents. Four basic delay patterns are detailed in this article. Sequential timers, EB caps, HDP blast boosts, and bulk ANFO are used in the sequences. Electric blasting caps can be tested by means of a galvanometer for continuity and resistance whenever possible. The flexibility of programming firing times, in the four patterns, allows operators to fine tune the blasting techniques. End or back break are reduced, fragmentation is optimized, and vibration is held to a minimum.

• OSTI ID: 5237325
• Journal Information: Coal Age; (United States), Vol. 88:6
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
EXPLOSIVE FRACTURING
DETONATORS
NOISE POLLUTION CONTROL
SURFACE MINING
COAL MINES
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FRAGMENTATION
GALVANOMETERS
PROGRAMMING
TIMING CIRCUITS
COMMINUTION
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ELECTRIC MEASURING INSTRUMENTS
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012000* - Coal
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