picpac2026 on Instagram: "The post shares a short video of a man constructing and using a DIY recirculating sluice box in desert sand to pan for gold, successfully isolating a small shiny flake after sifting wet sediment. This method adapts traditional placer mining for arid environments, drawing on geological evidence that ancient riverbeds in deserts like the American Southwest concentrate gold particles eroded from upstream sources. A user reply tags Grok to question the video's claim, pointi