Abstract
Modernization to blasting works has not much improved at limestone quarries in Japan, although heavy machinery and computers were introduced to mining works.Shuhou quarry has attempted to modernize fragmentation due to blasting and improved the works, recently.Continuous monitoring of indices, such as number of secondary blasting, amount of dozing job and loader productivity, as well as performance of trial blasting, to find effects of blasting on fragmentation was conducted.It was found that the bottom charges using non-electric detonator and AN-FO charger for open pits made those indices more desirable. Also, the labor for charging work was reduced due to mechanization. A further improvement is planned for fragmentation control due to blasting.
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