An ERT survey has been carried out in an area of Höganäs municipality, Sweden. The aim of the survey was to locate old mine shafts where coal was previously mined. The result should be used as a basis for facilitating the municipality's detailed planning work so that future exploitation of buildings is carried out in a safe manner. The ERT survey consist of four lines performed with gradient configuration and a electrode separation of 2 meter. The direction of the mine shafts is presumed to have a north-easterly direction. All ERT lines have been placed to measure perpendicular to the direction of the mine shafts. The result show anomalies that initially was interpreted as mine shafts and later verified with geotechnical drilling.

The inverted resistivity model of line 1, 2 and 3 indicates a low value in residuals. Line 4 indicates high residual that probably is caused by high conductive material in the ground in or close to the line. The results from this investigation have not shown clearly that the mine shaft consist of a cavity in the rock, but rather a change in the quality of the rock, probably have the mine shafts been filled and/or have collapsed.


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