Planung der Erweiterung des Diabassteinbruchs Saalfelden für die Abbauphase 2

This thesis focuses on the planning for Phase 2 of the diabase quarry “Tagbau 21 – Schönangerl”. The approval for this phase of extraction has been in place since 2004 in the form of an Environmental Impact Assessment (EIA) permit. All the framework conditions are considered and are implemented during the planning process. As part of a core drilling program conducted in 2010, 2011, 2012 and 2017, the deposit was examined regarding its lithological composition. Based on the data obtained, a block model is developed in this study to represent the qualitative distribution of the material within Phase 2. While planning the expansion of extraction activities, several operational challenges are identified. For each of these, specific solution approaches are developed and compared: Unfavorable Quality Distribution: The block model indicates that, for a total extraction volume of 13,5 million to in Phase 2, approximately 10% corresponds to Q1 material, 38% to Q2, and 44% to Q3. To manage the surplus of Q3 material, it is recommended to transport it in parallel using a rented fleet of trucks. This results in annual costs of approximately 360.000 € over a twelve-year period. Extended Haulage Distances: As extraction progresses, the transport distances to the crusher increase significantly. To maintain continuous material flow, the acquisition of a second rigid dump truck is recommended. Although this entails annual costs of around 135,000 €, it ensures consistent feeding of the crusher and continued use of the tunnel conveyor’s energy recovery system. Crusher Relocation: Since the crusher is located outside the main extraction area at the beginning of Phase 2, it is proposed to relocate it. This would shorten haulage distances and reduce both energy consumption and equipment wear. A second relocation is required at the end of Phase 2 for operational reasons. This measure also eliminates the need for a large conveyor belt. Tunnel Support Pillar: A permanent support pillar is planned for the conveyor tunnel. The resulting loss of extractable material is estimated at approximately 2.5 million € for Phase 2. Conclusion: The implementation of Phase 2 involves significant investment. However, it is essential to enable access to the high-quality material reserves in Phase 3 which is crucial for ensuring the long-term economic viability of the site.