Backfill composition effects on backfill optimisation in massive mining

摘要

Backfill is a crucial component of artificial support used in massive mining. The primary mining method used in this study is overhand cut and fill mining, with variations of long-hole stoping in areas that permit such a mining method. Overhand cut and fill mining depends primarily on backfill so that the next lift in the orebody is made. The backfill has to be able to sustain the stresses from the heavy machinery and the induced stresses from mining operations in order to provide stability and safety in the mining environment among its other uses. Efficient backfill systems could save costs for the mine and enhance the mining operation. This study investigated the effects of backfill composition on backfill optimisation at a massive mine. A study on different materials that could have potential to be used in the mine was conducted. Laboratory test results were collected from previous studies as well as from outsourced companies hired by the mine to evaluate the composition of the backfill. An economic benefit assessment of the study indicated that cement consumption could be reduced from 14% to a standard of 10% and yield better backfill strength without the use of a super- plasticiser.