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DRILL & BLAST


SCANNING W


SOPHISTICATED


Alexander Hansson details how a CT scanner reveals gold and scheelite in drill core samples


ith a novel drill core scanner, continuous acquisition of X-ray CT data from drill cores can be performed on-site, at a speed


compatible to core logging. T is type of data was often retrieved by scanning selected core pieces cut in suitable lengths, to study sections of a drill hole in detail – often a time-consuming procedure. Using the full data from the whole volume and length of the hole makes continuous data simultaneously available for x-ray CT, density and elemental concentrations, over the length of the hole. T e scanning can also be done by sending core boxes to one of Orexplore’s labs.


Orexplore’s GeoCore X10 drill scanner


HIGH ATTENUATION PARTICLES


High attenuation particles can be detected and quantifi ed in 3D x-ray CT data. Minerals with elements of high atomic number, Z, e.g. gold (Z = 79) and scheelite (CaWO4


, W: Z = 74) show up Fig.1. Gold particles (red) 14 www.engineerlive.com


as high attenuation particles in GeoCore X10 data in case the particles are resolved


with the 3D pixel grid (with 0.2 x 0.2 x 0.2mm pixels in the standard scanning scenario of up to 6m/h).


STUDYING GOLD IN DRILL CORES In Fig.1, 3D x-ray CT data of 3cm from a drill core is shown, highlighting quartz (blue), pyrite (yellow) and gold (red) in a host rock (grey) based on the


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