complexe gangue-minerai

CONT: Suivant l'aspect du complexe gangue-minerai, de Launay distingue les structures rubanées, bréchiformes et confuses.

CONT: Au [gold], when present in significant amounts in Zn-Pb skarns in northern Mexico and the northern Canadian Cordillera, is commonly concentrated with sulphide-rich proximal ore and gangue mineral assemblages either close to a known intrusive contact or in the core of the deposit as deduced from the mineral zonation where no intrusion is exposed.