Evaluation of the Environmental Impacts of Blasting in Okorusu Fluorspar Mine, Namibia

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Author(s) Akande J.M. | Aladejare A.E. | Lawal A.I.
Pages 101-108
Volume 4
Issue 2
Date February, 2014
Keywords Blasting, Mine, Air blast, Impact, Fly rock

Abstract

Blasting is one of the main methods used in the mining industry to fragment hard rock minerals. Blasting is an inherently dangerous activity which can result in serious injury, death, and/or damage if not designed and performed professionally. The work done in this paper is to evaluate these negative factors associated with blasting operations to the mining environment. Four different monitoring places (Mine Offices, Old Crusher, New Crusher and the Mine Hostel) in the mine were selected. Five experimental trial blasts were conducted as from the 14th to 28th November at various pits (D and B Pits) of the mine during the period of field investigation with varying designs and charging patterns. The magnitude of ground vibration and air blast, sound level data evaluated varied between 1.402 and 11.304 mm/s, 0.00354 and 0.0214 Kpa, 104.963 and 120.599 Lp (dB) respectively. Both the magnitude of ground vibration and air pressure were well within the safe limit, however the level of sound generated(120.599 Lp(dB) ) from Blast No. 5 near the Old crusher, located at a distance of 771.07 m from the blasting site, it was slightly higher than the maximum safe limit of 120 Lp(dB). This indicates that blasting operations in Okurusu Fluorspar Mine are done without noticeable environmental hazards.

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