Geomechanical Estimation of Unique Deposits of Soft Iron Ores Under High Pressure Aquifers

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DOI : http://dx.doi.org/10.13005/bbra/1974

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ABSTRACT:

This paper deals with the hydrogeological specifics of developing the unique Yakovlevo deposit of rich iron ores of the Kursk magnetic anomaly (Russia) with discovered reserves of 9.6 billion mt and iron content up to 69%. The analysis of the methods of the development of mineral wealth deposits with high pressure aquifers in the covering rock mass was done, and rational approaches and criteria were found to ensure safe mining. The methodology was developed, and modeling of rock mass shift was made for basic stages of deposit’s development taking into account the construction of protective cover. Shift arch size and rock mass shift distance during excavation and stowing were found. The concept of rational development of ore chute was offered taking into account mining safety and economic feasibility of development. On the basis of the dependencies of rock ore mass and enclosing rocks deformation found during ore chute development, basic parameters of protective cover and excavation procedure were reasoned.

KEYWORDS:

underground working; iron ore; aquifers; hydrogeomechanical model; rock mass shift; rational parameters