Improvement of extracted iron ore grade in underground mining

Abstract

Decrease in grade and high losses of broken ore are stated to be important problems that accompany the process of marketable production in mining of iron ore deposits by underground methods. The article analyzes and generalizes causes of high losses and dilution of broken ore during its drawing underground. It is found that dilution of ore with waste rocks results in the decreased iron content in the extracted ore mass as compared to that in the ore massif. The research performed enables development and scientific substantiation of a rational technology of ore drawing and transportation that improves the mined ore grade by more complete extraction of broken reserves of clean iron ore from the ore body footwall.