Introducing "Gold Prospecting in the United States," an Article by Harold Kirkemo

Here is an article with a ton of information about gold prospecting. Did you know groundwater collected from wells, springs, and drill holes may provide clues to the presence of subsurface gold deposits? As groundwater flows through the deposit, minute amounts of gold are leached from the rocks. These can sometimes be detected in groundwater samples collected from wells located down gradient from the deposit. USGS image.

Learn about where gold has been prospected, the best productive areas, twice-worked areas, challenges in prospecting for color, and wealth of information from the USGS. Check it out. 

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https://geology.com/usgs/gold-prospecting/