Supergene gold mineralization from exploited placer ...
The occurrence of crystalline aggregates of gold and authigenic gold in the form of octahedral crystals or concentrations with a typical spongiform structure on the surface of rounded gold grains and nuggets in alluvial placer deposits indicates postdepositional remobilization of gold in the placer itself (Youngson and Craw, 1993, Hough et al ...