Obsidian conveyance among hunter-gatherers in northwestern Patagonia

•Six obsidian sources increased their use in the Late Holocene in north Patagonia.•The closer source to Diamante Valley, is the least used.•The best quality source, Las Cargas, was the most used across the Late Holocene.•Obsidian helped to minimize risk in the occupation of high elevation locations.•Obsidian exchange routes may find a pattern in least cost path analysis results.•Exchange of obsidian followed routes through High elevations villages to sources.