Experience of inter-chamber pillar mining after consolidation of the primary chambers' backfill

Abstract

In 1966 at the Kaula‑Kotselvaara mine of the Pechenganikel Combine, experimental work was carried out on the development of an inter‑chamber pillar located between the walls of cement‑reinforced backfill. Pilot works were carried out in a 6‑8 m thick section of the ore body with a dip angle of 26‑30°. The host rocks – phyllites – are partially broken by transverse fractures. In general, the ore and rock are stable. The strength coefficient of the ore is 8‑12, of the rock – 10‑12. Bulk density of the ore is 3.2 t/m³, of the backfill material – 2.8 t/m³.

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