AT NORANDA, the strength of the ore and wall-rocks permitted mining in large open stopes. While some of the orebodies were small and could be mined out in one stope, in most cases their size was such that it was essential that ore pillars be left during the first stage of mining. In these cases, backfilling has been necessary for ground control and to facilitate the later recovery of the ore in these pillars. This paper discusses the development of the backfill and 1ts use in pillar recovery.
Backfills, magnetite, oxidation, pyrrhotite, slag, stope, mining, pillar, Pillars, Slag, Slags, stope, stopes, tailings