Eluvial and Alluvial Placers and Gold-Quartz Vein

Sketch illustrating outcrop of a gold-quartz vein supplying material to form eluvial and alluvial placers. By one terminology, an eluvial placer embraces all materials not transported by streams. By another, only the placer materials over weathered and disintegrated deposits constitute an eluvial placer; downslope and other placer materials are classified as deluvial and proluvial as shown.

gold-quartz_vein_supplying_material_to_form_eluvial_and_alluvial_placera

 

Eluvial_Alluvial_Gold_Placer_deposits_around_world
Principal unconsolidated (nonlithified) eluvial and alluvial auriferous placer districts of the world (Many of the districts shown have long been exhausted.)