en2015-08-18 17:34 PM CESThttp://inspire.ec.europa.eu/codelist/ExplorationActivityTypeValue/reconnaissanceCoreDrilling:1http://inspire.ec.europa.eu/codelist/ExplorationActivityTypeValue/reconnaissanceCoreDrillingDrilling of a cylindrical hole with an ad hoc tool in order to collect a rock sample, or to carry out a physical measurement or a geological observation. By extension, designates also the drill hole, whatever the latter's purpose. Boreholes are drilled by coring. This technique is used to collect undisturbed rock cylinders and allows to confirm/to precise results from percussion drilling.