Work at the CSIRO Lucas Heights Laboratories has further developed LIBS as a routine analytical tool for mineral elemental analysis. Using a calibration and validation methodology, quantitative LIBS measurements of a range of mineral ores have been demonstrated in the laboratory including lateritic nickel ores, lead-zinc ores and iron ores. This work culminated with the first analytical measurement of phosphorous in iron ore at trace concentrations in ore samples using the LIBS technique.

The technology implementation plan offers the potential for major impact in Australian iron ore operations in regard to resource optimisation during recovery.

LIBS is an optical method for simultaneous multi-element analysis applicable to a wide range of solids, liquids and aerosols. The LIBS technique uses a pulsed laser to initiate a plasma spark at the surface of, or in, the sample to be analysed. Subsequently, the light emitted from the plasma spark is analysed using a spectrometer and the elemental composition of the sample is estimated on the basis of that analysis. In solids, LIBS is a surface analysis technique and therefore a link between the sample surface and the bulk composition needs to be assumed or demonstrated.

A major platform of research and development is being progressed with an industry partner to deploy the technology for trial in its mine operations. A down hole analyser has been developed and integrated with a 4WD vehicle platform suited to the client’s mine operations. The analyser and vehicle system are currently undergoing trials at a local quarry near Sydney before undergoing mine site trials in the Pilbara during the first half of 2011.