📋 Tender Overview
Key PointsThe mining industry is set to benefit from a new Australian capability that uses a nuclear scanning technique to detect the presence of precious metals and strategic minerals in a drill core sampleResearchers from ANSTO and Macquarie University proved that the instrument was viable for mineralogical assessmentsThe neutron tomography instrument Dingo at has been modified to hold drill core samples for scanning in order to produce a 3D image of the coreThe mining industry is set to benefit from a new Australian capability that uses a nuclear scanning technique to detect the presence of precious metals and strategic minerals in a core sample.The approach which involved enhancements to the neutron tomography instrument Dingo at ANSTOs Australian Centre for Neutron Scattering is expected to be available to industry later in the year.A neutron tomography scan is similar to an X-ray CT scan but uses neutrons neutral subatomic particles produced by the OPAL multipurpose reactor. Neutrons provide an alternative and complementary contrast to X-rays in essence a fresh set of eyes on the same material.Traditionally neutron CT scans took much longer than X-ray CT scans. With this new development it has become a fast cost-effective and non-destructive way to map the concentration and distribution of minerals in a rock core explained instrument scientist Dr Joseph Bevitt who worked with a team at ANSTO and Macquarie University to add the capability to the instrument.The concept was tested successfully with the support of Aurelia Metals Ltd. who provided cores for testing from the Hera Mine a gold-lead-zinc-silver deposit located 100km south-east of Cobar NSW and in collaboration with Dr Timothy Murphy from Macquarie Universitys Geoanalytical laboratory.The ANSTO team comprising engineering and technical staff developed a four-row rig to hold the cores for parallel scanning.The instrument produces a three-dimensional image reconstruction of the drillcore which is achieved by rotating the cores in the neutron beam while acquiring thousands of shadow radiographs.Using high-powered computing facilities these are converted into 3D visualisations of the drillcores. This data can be used to extend 2D surface mineral maps achieved using X-ray fluorescence to more accurately report mineral content within entire drillcores.Our collaborators at Macquarie University were satisfied that the images were viable for mineralogical assessments and are developing new methods to explore and integrate these datasets into geological and geochemical analyses said Bevitt.Depending on the desired scan resolution non-destructive neutron CT scanning of one- metre drillcore lengths can be completed in an hour.At present industry and research institutions use X-ray techniques for high throughput drillcore inspection and analysis.However X-rays cannot penetrate samples that contain abundant heavy metals such as lead without losing image contrast.Neutrons overcome this limitation as lead and a number of other commonly occurring minerals that are problematic for X-rays are more transparent to neutrons said Bevitt.PlayThe cartridges in the scanning rig can hold four cores up to 1.5 metres in length with a maximum diameter of 80 mm each.The team intends to make further improvements upon the prototype apparatus including increased parallelisation to increase output by 50 and robotic changeover of sample cartridges for automated bulk scanning studies.Most importantly planning is underway for the installation of an X-ray source to enable bi-modal neutron and X-ray tomographic imaging of drillcores.Bi-modal imaging opens up the opportunity for holistic 3D mineral mapping based on the combination of independent X-ray and neutron contrasts.This is a new application as our instrument is used primarily for the analysis of cultural heritage materials palaeontological specimens and engineering materials said Bevitt.Given the importance of the mining industry in Australia we think this new technique will enhance exploration activity and better inform environment sustainability.ANSTO operates a suite of instruments at The Australian Centre for Neutron Scattering the Australian Synchrotron and the Centre for Accelerator Science that can be used for minerals research. ANSTOs Minerals business unit offers a range of consultancy process development and research services to the mining industry.
