Talk:Drilling and blasting

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[edit] Is there an article on Jumbo drills?

That was the only name I heard, so I see no way to search for it. It would be several rock drills mounted on a truck chassis. Each drill would be on a arm. The one I saw on TV had 3 arms, but only 2 drills. So I was trying to figure out what the 3rd arm was for. Most jumbo drills appear to be used as part of underground drill and blast operations.--Will 05:26, 16 August 2006 (UTC)