Mixed-Type Cave-and-Backfill Technology of Deep-Level Mining of Flat-Lying Ore Bodies
S. Yu. Vasichev
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Flat-lying ore bodies, rock mass, depth, ore body thickness, mining, system, extdaction, modeling, stress state, caving, backfill, roof, stope, pillar, strength, stability, safety, efficiency
Abstract
The author addressing the problem of selecting a rational underground technology for deep-level mining of flat-lying ore bodies. A mixed-type technology is proposed, with the controlled caving and cemented paste backfill as the mutually complementary components of single stoping flowchart. This solution allows the targeted adjustment of stress distribution in rock mass, decrease of the risk of hazardous deformations and maintenance of the stability of structural elements of stoping at different stages of mining. It is found that the cave zone formation ensures relaxation of backfill and temporal ore pillars, as well as decreases the probability of uncontrollable failure in adjacent rock mass. the technical and economic analysis shows that this mixed-type technology is the most effective in mining low-grade and crude ore at depths where conventional systems with backfill are expensive and cave mining systems become unsafe and inefficient because of higher ore loss and dilution. The mixed-type technology is recommended for deep and flat-lying ore bodies as it ensures safety, completeness and higher quality of extraction, as well as its economic efficiency.
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