What started as a 911 call at 2:15 p.m. Oct. 10 quickly turned into a dramatic standoff between Knoxville Police Department bomb technicians and a 5-foot-by-5-foot steel box filled with explosives.

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In an expansion project at its Chambishi mine, in Zambia, metals company Non-Ferrous China Africa (NFCA) opted to install explosives company AECI Mining Explosives’ emulsion vertical delivery system ...