Gan Gan is a name for a place of discovery, which admits into the year 2008 only as “place between Passo Berwin and Mirasoles”. In the proximity of the village Gan Gan was a ( meanwhile completely searched over ) finding zone of intensively colored and strongly contrasting agates with fine banding. These usually only 60 mm up to 80 mm, rarely up to 120 mm large agates belong to the most magnificent of Patagonia.