Darlot Gold Mine - Optimising cemented paste fill using BASF MasterRoc MF 505C
Location: Western Australia
Project completed: Ongoing
Market sector: Underground Construction
- MasterRoc MF 505C
Darlot Gold Mine, operated by Gold Fields Australia, is situated 120 kilometers north of Leonora and 58 kilometers east of Leinster in the Yandal Greenstone Belt (Western Australia).
Darlot required a faster mining cycle to mine the new ore body efficiently. BASF were engaged to assist with the improvement of the paste fill mix utilising chemical admixtures. The aim was to develop a paste where exposure from stoping could commence sooner or cement content could be reduced.
Based on laboratory and site-based trial results, it was decided that MasterRoc MF505C would be added to all stage one (plug) pours in Lode 1 going forward.
Laboratory and large scale (site-based) trials were undertaken using MasterRoc MF 505C with aim of increasing the quality of paste fill, so that paste development, side exposure and undercut curing times could be reduced and Lode 1 extraction rates could be increased.
The greatest strength gain was observed within the 14 – 28 day undercut curing window, with 400ml per wet tonne chemical addition.
Based on trial results to date, the addition of MasterRoc MF 505C to paste fill mix will allow a two-day reduction in undercut curing time compared to LOM plan.