Real-Time Image Analysis of Iron Ore Cores and Drill Chips to Complement Spectral Measures

Diamond cores and drill chips provide the only direct physical evidence for ore containing rocks.
Early characterisation of cores and drill chips is important as it provides critical information
for downstream processing. Traditional characterisation techniques include visual logging by a
geologist or analytic and spectroscopic methods but they are time consuming and can miss some important textural or geomechanical features.
The goal of this work is to evaluate the application of image analysis to iron ore cores and drill
chips and to suggest improvements to existing core-scanning and chip monitoring systems. Two
samples of massive ore differing by their mineralogy and texture, as well as two different batches of drill chips, have been imaged and analysed. Results are compared in function of the imaging system and the classifi cation algorithms.
As a conclusion, despite the necessity for more testing and improvements in calibration and
lighting, it is obvious that image analysis technologies can bring a lot of useful information in the
perspective of a geometallurgical mapping of the deposit.