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Drilling related queries, page-7

  1. BGH
    40 Posts.
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    Hi Beaner

    Is it a necessity to to use a RC rig to drill the over burden? I'm curious as they only used DD rigs in the first round of drilling from what I can see through announcements. Also the competent rock around previous hole 7 starts from surface so you would think no RC will be needed to pre collar. Genuinely asking as i don't know jack sheet about drilling.
 
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