Abstract

Research methods for evaluation of natural stone deposits are evaluated as a part of the project “Efficient use of natural stone in the Leningrad region and South-East Finland”. The most common methods in the beginning of the site investigation process of a new natural stone deposit are detailed mapping of fractures and ground penetrating radar (GPR) measurements carried out on an exposed mapping traverse. Small scale samples are also collected to evaluate the aesthetical appearance of the stone. After these diamond core drilling is carried out to get a three-dimensional view of the stone quality. Mapping, GPR measurements and diamond core drilling have each their strengths in evaluation and they also overlap in detection of some common features. Fracture mapping carried out on the surface and GPR measurements can be combined in conditions where GPR reflections are strong, usually in intersections of sub-horizontal and sub-vertical fractures. GPR and diamond core drilling can be combined to detect major sub-horizontal fractures and in some cases also fracture system of the surface layer if the fractures are open enough and contain water or moisture.

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