The atlas has been updated with images from the Onto Deposit in Indonesia courtesy of David Burrows. The Onto deposit currently has an indicated resource of 0.76 billion tonnes (Gt) at 0.93% Cu, 0.56 g/t Au, 5 g/t Ag, and 350 ppm As (7 Mt contained Cu, 13 Moz Au) and an inferred resource of 0.96 Gt at 0.87% Cu, 0.44 g/t Au, 3 g/t Ag and 350 ppm As (8.3 Mt contained Cu, 14 Moz Au). In addition to these resources, an exploration target of 0.6 to 1.7 Gt at 0.4 to 0.7% Cu and 0.2 to 0.3 g/t Au has been delineated in a sur- rounding envelope based on drilling at approximately 200 × 200- to 400 × 400-m centers. Also recent samples are included from the Khvav Project in Cambodia.
Vuggy silica textures are formed by the dissolution of phenocrysts and entire clasts by hot and strongly acidic fluids that are generated during the cooling and crystallization of near surface intrusive bodies. Vuggy silica is often mineralized but is also a strong indicator of a very active hydrothermal system and epithermal Cu-Au-Ag and porphyry Cu-Au deposits at depth.
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