Exploratory borehole Siblingen. Investigation report

In 1980, Nagra launched an extensive geological investigation programme covering an area of some 1,200 km2 in Northern Switzerland. The aim of the programme was to collect the geological information necessary for assessing the suitability of the crystalline basement as a disposal medium for high-level radioactive waste. The Siblingen borehole was the seventh in the deep drilling programme. The drill site lies within the community of Siblingen in the Canton Schaffhausen. The final depth of the borehole was 1,522 m. This report summarises the most significant results obtained during the course of the programme. The series of investigation reports for the deep boreholes is structured in such a way that crosscomparison can easily be made between the results and datasets for the different locations. However, the conclusions to be drawn from the data will be reserved for a final synthesis report. Detailed documentation of the individual experiments is provided in Nagra's Technical Report series. (author) tabs., refs