Problem description This article presents case of the small scale trial excavation utilizing adapted backfilling mining method. Focus herein is on mining method itself and excavation technology. Underground mine is already developed to the depth of 100m where excavation will take place. Average copper grade is 1.3%, ore body morphology is lens-like or… Continue reading Small scale trial excavation design
We are going to give an example on blast pattern design for the case of underground drift (4 x 3m) with rectangular cross section. Parameters that we are using are: Rock: Tensile strength = 6 MPa Poisson’s ratio = 0.25 Explosive: Density 1.1 g/cm3 VOD = 4.1 km/s Drilling: Hole diameters = 51mm Charge… Continue reading Blasting pattern design
Introduction Blasting is dominant way of excavation in mining and tunneling and as such has been subject of research for long time. Blasting procedure is relatively simple, drilled holes are filled with explosive that is detonated. Detonation and gaseous products induce pressure in the rock and its fragmentation. Design of blasting pattern is process… Continue reading Rock fracturing mechanisms by blasting
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