6th direct order

The concept for the final closure of the Gyöngyösoroszi Ore Mine involves the backfilling of the opened drifts and excavation system of the Mátraszentimrei mining area, with the aim of sealing the exposed ore surfaces to eliminate the possibility of sulfide mineral oxidation (primarily pyrite). This will lead to a reduction in acidification from the dissolution of oxidized pyrite, resulting in lower toxic metal content in the waters emerging from the Mátraszentimrei area, thereby improving water quality in the long term. Another objective of the backfilling is to eliminate the formation of uncontrollable pressures due to collapses resulting from the degradation processes of the drifts. The tasks for the closure of the Gyöngyösoroszi Ore Mine are defined from a mining perspective in the current Technical Operating Plan, and from an environmental perspective in the environmental operating permit and the technical intervention plans. During the backfilling work that began in 2012, 87,000 m3 of void volume has been backfilled to date. These works must continue in phases, including the backfilling of the drifts from the 6th level West from 1978-79, the West strike drift, the 3rd bypass drift, the South exploratory drift, the North waste crosscut, and the 6th level East drainage drift. In the final phase, the beginning of the North crosscut, the inclined shaft, and the vertical shaft must be backfilled. The vertical shaft will be closed with mixed backfill. In total, this represents approximately 10,000 tons of paste backfill. Two types of backfilling technology will be used in the project: for inaccessible mine voids, paste will be delivered from above through vertical boreholes or breakthroughs created from the 6th level, or through chutes; for accessible, secured mine drifts, paste will be delivered from the front through pipelines installed in the drifts. At the Mátraszentimrei site, personnel, freight, and special freight transport for underground mining activities takes place via the vertical shaft. The operational tasks of the vertical shaft must be carried out in accordance with the requirements of Decree 23/2022. (I. 31.) SZTFH on the safety regulations for underground mining activities. Based on consultations with the authority during the performance of the framework agreement, the contractor's tasks include mining design and design supervision. In performing these tasks, the contractor must prepare the approval and/or construction design documentation according to the finalized technical content. The design task includes the necessary consultations and administrative procedures with the involved parties, as well as design supervision. Performing mine rescue tasks, underground work, or, in case of suspension, carrying out legally prescribed inspection and guidance, performing operational tasks for the Mátraszentimrei site, Altáró site, and the Száraz-völgyi tailings pond, as well as operating the mine's communication, ventilation, electrical network, medium-voltage network, and rail transport systems. The contractor is responsible for performing mine rescue tasks in the mine operations located on the mining plots named "Gyöngyösoroszi I.-érc" and "Recsk I.-rézérc". Indicative, estimated quantities for the duration of the framework agreement: Landscaping of waste dumps and the Száraz-völgyi tailings pond: 45,950 m2 Remediation of Toka stream and Száraz stream: 6 km Remediation of Gyöngyös-Nagyrédei reservoir: 150,000 m2 The task execution will take place in an underground mine. The following main tasks must be carried out during the backfilling work: • Backfilling of 10,000 m3 of void system during the preparation and backfilling work of paste backfill; The execution of the tasks requires: • Installation of the backfill pipeline network (1,402 linear meters with mixed diameters); • Construction of distribution and level-blocking dams (100 m3); • Operation of the vertical shaft (340 shifts – 1 shift/1 day corresponds to 12 working hours in accordance with item 94 of the price list (detailed budget)); • Level drifts, the Altáró, and the Mátraszentimrei crosscut...