Applied scientific and systemic problems of the related ore-dressing plants interaction in the event of decommissioning the massif that separates their quarries

Volodymyr Azarian¹, Serhii Lutsenko¹, Serhii Zhukov¹, Andrii Skachkov², Ruslan Zaiarskyi³, Danylo Titov¹

¹Kryvyi Rih National University, Kryvyi Rih, 50027, Ukraine

²PJSC “Northern Iron Ore Enrichment Works”, Kryvyi Rih, 50079, Ukraine

³PJSC “ArcelorMittal Kryvyi Rih”, Kryvyi Rih, 50095, Ukraine

Min. miner. depos. 2020, 14(1):1-10

https://doi.org/10.33271/mining14.01.001

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      ABSTRACT

      Purpose. Determining the possible and substantiating expedient alternate design and engineering decisions regarding the stage of spacial union of the adjacent quarries belonging to various owners by mining the rock pillar between the No. 3 quarry of PJSC “ArcelorMittal Kryvyi Rih” and the quarry of PJSC “Southern Mining Factory” with involvement into mining the reserves, extraction of which is possible within the existing mining and land allotments.

      Methods. It was used an integrated methodological approach, including mining and geological analysis of the rock massif between two adjacent quarries, which is subject to decommissioning; technical-economical analysis of the operational efficiency of the ore-dressing plant when decreasing the ore mine productivity as a result of cleaning-up the deposit; theoretical substabtiation of design and engineering decisions regarding the quarry objects parameters in the specified conditions and with the efficient development of a rock pillar that separates quarries.

      Findings. The state of the projects and plans for the development of mining operations in the No. 3 quarry of PJSC “ArcelorMittal Kryvyi Rih” and the quarry of PJSC “Southern Mining Factory” has been analyzed, which, in the coming years, indicates their spacial union. It has been revealed that the decommissioning of the rock pillar between the quarries is complicated both spacely and technologically, especially as a result of seismic restrictions, but the proposed solutions and measures simplify and make safe this stage as much as possible. The problem has been defined of reduce in the loading at the dressing plants proportionally to the decline in ore output. The technical-economical calculations substantiate that the corresponding sequential decommissioning the enrichment sections of the ore-dressing plants is expedient at one of the two cooperating ore mining and processing plants.

      Originality.An integrated approach has been improved regarding the evolution of mining and processing enterprises at the stage when their quarries approach to the maximum depths and final contours by taking into account adjacent ore mines as a single complex dynamic system. The analytical substantiation of drilling and blasting technology of the rocks destruction has been adapted to the specific conditions of decommissioning the pillar adjacent to both quarries.

      Practical implications. It is distinguished their high level of suitability for implementation and use in the designing of mining operations development in the quarries of PJSC “ArcelorMittal Kryvyi Rih” and PJSC “Southern Mining Factory”.

      Keywords: quarry, rock massif, blasting, ore-dressing plant, concentrated product, iron content

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