Abstract: The present invention, relates to the recovery of zinc values from an acidic solution containing hydrocyanic acid. The zinc is recovered as complex zinc cyanide anions which may, if desired, be recycled for the (selective) preliminary removal or separation of adsorbed copper values from an (strong or weak base) anion exchange material, the anion exchange material additionally being loaded with adsorbed cyanide complexes of precious metal values such as gold and silver. The invention, further relates to the recovery of cyanide values associated with copper cyanide complexes which are adsorbed on or taken up by an (strong or weak base) anion exchange material; the recovered cyanide values, for example, being available for recycling to a cyanide leach stage for leaching additional metal values from an ore or the like.

Abstract: A data storage and retrieved system and process for use with structural items of data relying on associative indexes to connect related items of data and not to connect unrelated items of data. The associative indexes being formed from mathematical and/or boolean expressions for allowing know-how of a expert, stored in the system, to be extracted and put into context to a particular situation by a user inputting choices among alternatives and data into the system.