Job Overview Vault Minerals operates two underground mines near Geraldton. * The company is a dynamic entity born from the merger of Red 5 Limited and Silverlake Resources. The Production Engineer plays a pivotal role in designing safe stope plans, generating prep and charge plans, preparing airleg rise plans, creating drill and charge plans for ventilation rises, producing tele-remote bogging plans, developing weekly schedules, producing work instructions for ancillary activities.