1930 Apart from changes in the prediction model, another critical step in the modelling component was to introduce the prediction of flyrock at multiple stages in the drill and blast cycle (Figure 6). Figure 6 – Multi-Stage flyrock modelling Flyrock modelling is not a one-time task. The framework applies modelling at three stages of the drill and blast process: • Design/Concept Stage: An initial prediction made during blast planning using the design parameters. • As-Drilled Stage: Once drilling is completed (and actual drill logs are available), the model is rerun using updated inputs (actual hole depths, etc.). This second-stage validation refines the clearance requirements and can result in an adjustment of the charging requirements. • As-Charged Stage: Once explosive loading is completed, the model is again rerun using updated inputs (actual explosive mass, stemming, etc.). This third-stage verification refines the hazard estimate and can trigger last-minute changes, such as relocating equipment or personnel to a safer distance if the risk appears higher than initially thought. To standardize across all the company’s mine sites and accommodate the adapted prediction model, a web application (FRED) was developed (Figure 7). The application is linked to the drill and blast design and management software used by Anglo American’s mine sites, namely BlastLogic (Tordoir and Roberts, 2019).
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