The proceedings of the 25 years SGA (Society for Geology Applied to Mineral Deposits) Anniversary Meeting, held in Nancy, France, August/September 1991, focus on many approaches which permit the understanding and quantification of metallogenicMoreThe proceedings of the 25 years SGA (Society for Geology Applied to Mineral Deposits) Anniversary Meeting, held in Nancy, France, August/September 1991, focus on many approaches which permit the understanding and quantification of metallogenic processes including identification of sources & transport.