How Everything Works on Instagram: "In certain regions, rivers with reddish, iron-rich sand can carry fine particles of gold that have been washed downstream from mineral-rich rocks over long periods of time. One fascinating and eco-friendly way to recover this gold doesn’t require chemicals or heavy machinery. Local miners and prospectors collect the red river sand and use gravity-based separation methods such as gold panning or sluice boxes. Because gold is much denser than surrounding sedimen