A geological survey is the systematic investigation of the geology beneath a given piece of ground for the purpose of creating a geological map or model. Geological surveying employs techniques from the traditional walk-over survey, studying outcrops and landforms, to intrusive methods, such as hand augering and machine-driven boreholes, to the us...
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http://en.wikipedia.org/wiki/Geological_survey
The drilling surface rock outcroppings for the purpose of exploratory developement.
Found on
http://www.juniorminers.com/glossary.html
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