Ran across this article about a family's gold prospecting ventures. It is very interesting and includes a photo of a rock crusher they designed and had welded up. This is worth seeing.
https://toughnickel.com/frugal-living/family-finds-gold#comment-17619385
Here is another one with a pdf for free download. http://www.homemadetools.net/homemade-rock-crusher
https://toughnickel.com/frugal-living/family-finds-gold#comment-17619385
Here is another one with a pdf for free download. http://www.homemadetools.net/homemade-rock-crusher
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