Health Hazards of Mining and Quarrying ILO Encyclopaedia
Health Hazards of Mining and Quarrying ILO Encyclopaedia The most common processes that produce respirable silica dust in mining and quarrying are drilling blasting and cutting silicacontaining rock Most holes drilled for blasting are done with an air powered percussion drill mounted on a tractor crawler The hole is made with a combination of rotation impact and thrust of the drill bit how to