Patterns to ores in layered rocks

Distribution patterns of syngenetic ore bodies in layered rocks correspond in area, symmetry, and metal variation with the rock facies structures. Distribution patterns of epigenetic ore bodies either correspond to antecedent and contemporary tectonic structures or deviate systematically under their influence. Many deposits have metallization, initially syngenetic, redistributed slightly by ground water of varied origin, and these occurrences acquire a tectonic asymmetry while retaining their syngenetic facies limitation. Selected examples of intensively studied deposits are cited and examined critically, and criteria are presented to indicate the syngenesis or epigenesis of metallization as distinct from mineralization.