Conventional narrow tabular
The conventional narrow tabular group of mining methods is labourintensive methods with a low level of in-stope mechanisation and are suited to reasonably flat dipping narrow tabular mineralised zones, covering large horizontal extents.
The mineralised zones targeted allow for a mining cut as low as 1.0m, and as high as 1.8m. Although some operations exist outside of these mining heights, the practical constraints generally outweigh the advantages. In a multi-reef environment, the geotechnical considerations become important to manage the rock stress and ensure the safety and sustainability of the panels.
The conventional narrow tabular mining methods mostly include conventional breast mining, up dip mining, downdip mining and several variations thereof. Access to the reefs and ore bodies are gained through decline systems, vertical shafts or a combination thereof. Strike access development is generally below the reef, but on reef strike development is possible, depending on the structural complexity of the mineralised zone(s).
Stoping is generally conducted by conventional jackhammer drilling and cleaning through winch scrapers, but mechanisation can be considered using existing technologies such as extra low-profile rigs and dozers. Ore transport systems could be track-bound, trackless or conveyor systems.
Our clients that apply these methods are generally situated in the Bushveld Igneous complex (on chrome and PGM reefs), on the South African gold and uranium reefs, and for PGMs and base metals on the Great Dyke of Zimbabwe.