Classification of backfill mining systems for underground mining of salt deposits

A classification of backfilling technologies has been proposed for underground mining of deep-seated salt deposits. An in-depth analysis of approaches to organizing mining operations in complex geological conditions has been conducted, considering the physical, mechanical properties and structural features of salt rocks, as well as the stringent requirements for maintaining the integrity of the water-protective layer. The main technological schemes for backfilling operations in deposits of water-soluble minerals have been reviewed, with their efficiency and impact on the stability of underground workings being evaluated. Key criteria for selecting the mining system have been identified, depending on the depth of occurrence and morphology of the ore body. Special attention has been given to the comparative analysis of various backfilling technologies, their applicability at great depths, and under varying physical and mechanical characteristics of the host rocks.