Safe mining face advance and support installation practice in mechanical miner workings under different geotechnical conditions.

Abstract

This research report includes a detailed literature review on acts and procedures in other major coal producing countries, an underground monitoring programme in various mining districts and numerical modelling. The literature review showed that in major coal producing countries it is stated that no one may go under an unsupported roof, and therefore the cut out distances are limited to 6.0 m. In South Africa the standard cut out distance is 12 m. However, permission may be obtained to exceed this distance from the district inspectorate in all these countries, including South Africa. Various procedures have been adopted by the district inspectorates to obtain extended cut out distances, including extensive underground monitoring and roof hazard plans together with ventilation plans and risk assessment investigations.