Aluminum, Platinum Articles May Be of Interest
https://goldprospectingarticles.blogspot.com/
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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 g roundwater 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. Copy and paste this link. https://geology.com/usgs/gold-prospecting/
Silver Mines Throughout History
For your information. This is my latest article. I love Arizona and I love reading about its history. I think it is a good read. https://hubpages.com/education/A-Brief-History-of-Arizona-Silver-Mining