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2.2 Drill and Blast This tunnelling method involves the use of explosives. Drilling rigs are used to bore blast holes on the proposed tunnel surface to a designated depth for blasting. Explosives and timed detonators are then placed in the blast holes. On
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Montana. A 5,650-m tunnel is required to gain access to the ore-bearing horizon (J-M reef). Associated by-product metals include rhodium, gold, silver, nickel and copper. As shown in Figure 3, the access tunnel (Adit #1) is being driven at an azimuth of 2
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In tunnel construction, we differentiate between two excavation methods: blasting and mechanised tunnelling using tunnel boring machines (TBMs). The choice of excavation method depends on various factors – e.g. route length, nature of the rock mass, econo
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In Table 2.2, the flushing velocities for top hammer drilling are indicated as function of air compressor flow and drill steel diameter. 2.3 TOP HAMMER DRILLING This drilling System can be qualified as the most conventional or classic, and although its us
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