DRILLING MANUAL - Geoscience

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Record 2004-007DRILLING MANUALJN DUNSTERNORTHERN TERRITORY GEOLOGICAL SURVEYNorthern Territory GovernmentDepartment of Business, Industry & Resource DevelopmentiNORTHERN TERRITORY DEPARTMENT OF BUSINESS,INDUSTRY AND RESOURCE DEVELOPMENTGeological Survey Record2004-007Drilling manualJN DunsterNorthern Territory GovernmentDepartment of Business, Industry & Resource DevelopmentNorthern Territory Geological SurveyDarwin, 2004iiDEPARTMENT OF BUSINESS, INDUSTRY AND RESOURCE DEVELOPMENTMINISTER: Hon Kon Vatskalis, MLACHIEF EXECUTIVE OFFICER: Mike BurgessNORTHERN TERRITORY GEOLOGICAL SURVEYDIRECTOR: Richard BrescianiniBIBLIOGRAPHIC REFERENCE: Dunster JN, 2004.

the overburden may be drilled quickly and cheaply (termed a precollar) using a hammer before the target is diamond cored. Geochemical sampling may involve grid drilling using RAB for reconnaissance and the more expensive RC for more reliable

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