Exploration drillings launched for Asse recovery shaft in a depth of 574 metres
The work is vital to be able to guarantee later on the necessary safety for the planned shaft.
Exploration drillings for Asse recovery shaft in a depth of 574 metres
With an underground drilling in a depth of 574 metres the Asse-GmbH continued the exploration for the planned recovery shaft. The planned shaft is a necessary prerequisite for the retrieval of the Asse wastes. As to whether the shaft site is suitable under the geological conditions can only be evaluated with the help of exploration work. In April 2014 the Asse-GmbH completed a 900-m-deep drilling that had been launched from a piece of woodlands near Remlingen. This drilling is now followed by further, horizontal drillings starting in the mine openings in depths of 574 m, and later on 700 m (cf. chart).
Apart from mining safety requirements, the future recovery shaft must also comply with nuclear safety requirements. This requires comprehensive examinations prior to construction. Vital for the further planning are also measurement data on the extension of the salt rock. Additional infrastructure rooms underground are required for retrieval. As to whether the salt structure provides enough room for this is subject to further research. Experts, for example, have to be able to rule out that the approaches to the shaft will meet aquifers and that thus water could flow into the mine.
The drilling place for the current exploration is located in a depth of 574 metres. The drillings have a length of about 350 metres towards the planned shaft. Comprehensive measures ensure the safety of the staff. A special lock at the drilling device prevents the release of toxic or explosive gases and liquids.