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Recent content by JENG

  1. JENG

    Help ; Drilling problems in Chert for Slope Stability studies

    Will welcome suggestions on approach to drilling/coring in formation with interlayering of clay and chert. We have cored ~ 40 feet in chert and get stalled by presence of voids in chert formation with loss of drilling mud and cuttings falling back in the borehole. Still need to go down at least...

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