Centimetre scale crystalline supergene gold nuggets are progressively liberated from basement sources

Nuggets have moved laterally only metres to tens of metres in colluvium and landslides

Surface abrasion of nuggets causes some rounding, and rounded nuggets are joined in colluvium by angular nuggets liberated during later erosion

Micron scale Ag-bearing authigenic gold overgrowths develop on angular and rounded nugget surfaces

Chemical gold mobility occurs in association with authigenic clay alteration of labile minerals in colluvium at pH 7–9