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the concentrates from the dry washer may be further refined by panning or other means. if water is very scarce the concentrates may saved and processed elsewhere. dry washers are portable comparatively inexpensive and easy to use. the dry washer is merely a tool for finding gold.
using a dry washer is a great way to find gold in many areas in the southwest. limited water makes gold prospecting difficult in many regions making common mining methods like panning sluicing and dredging impossible. they are a great way to find gold in arizona nevada southern california and other desert regions.
"a key goal was to distinguish shifts in terrestrial water storage caused by natural variability -- wet periods and dry periods associated with el niño and la niña for example -- from trends
they are literally a gold mine of placer deposits. there is also an enormous amount of gold-bearing mountainous dry placer ground which has remained relatively untouched by large-scale gold mining activity because of the scarcity of water required in those locations to support wet recovery methods.