Satellite imagery can be interpreted manually to characterize the extent to which illicit or unregulated mining is taking place in a defined area of interest. Information content includes: • location and extent of features related to illicit or unregulated mining • characterisation of features close to illicit mining sites that may represent a potential hazard (e.g. chemical tailings) Features associated with illicit mining are quite small scale (a few metres in diameter) hence reliable detection and characterisation requires very high resolution imagery. In addition, reliable detection of contextual features such as waste products from illicit mining may have colour signatures so multi-spectral imagery at very high resolution (i.e. 1-2.5 m or better) is of interest. In some areas, very high resolution radar imagery can also be used to detect features associated with illicit mining (e.g. for gold mining) – again resolution of at least 1m is necessary. Update frequency is driven by the orbit dynamics of the satellites. At present there are three different satellites capable of providing very high resolution optical imagery and six different high resolution radar systems and it is expected that this number will expand over the coming years. |