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|I In an optical microscope, mild attack by cyanide solutions on various minerals can be observed by means of colour changes as well as etching patterns. However, the mineral may not be identifiable due to the coloured film. In some cases, a transfer algorithm between mechanical stages enables the surface-altered mineral to be identified in the SEM. A more severe attack may not be so informative, as it is not known whether the mineral attacked has been completely dissolved away. The leaching behaviour of some common minerals is described.|