step if the original ore is sufficiently rich in base metals to warrant an acid leaching step following acid leaching a solid liquid separation process is conducted to remove an acid leach liquor rich in base metals the base metals may then be recovered using any of the existing known processes the solids removed during the solid liquid separation stage are then subjected to a cyanide leach at a range of temperatures between ambient and 160 u00b0 c following cyanide leaching a solid liquid separation step is conducted again with the residue being sent to tailings and the pregnant filtered cyanide leach liquor being further treated to remove the base metals and or the pgms following the recovery process the pgm concentrate is then available for shipping to the end user in relation to fig1 a pgm concentrate or an ore containing pgms is subjected to calcination and the off gas from the calcination process may be treated using any known process before being vented to atmosphere following calcination the residue is repulped and reground and then subjected to a cyanide leach after leaching a solid liquid separation stage is used to separate solids which are then repulped and sent to a residue storage facility illustrative examples based on test work will now be presented to exemplify the present invention and should not be construed to limit the inventive method in any way the test work is presented below in a series of tests which have been conducted either on oxidised ore i e the ore that is closer to the surface and may have been oxidised primary ore which is the below surface ore nominally less than 60 metres as well as whole ore throughout the test work the cyanide leach solution is a combination of sodium cyanide.