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The kind of substance is just like form but is full of holes to trap the gold, as a result of the force of gravity the gold is stuck inside the mat.
look at the image below 👇👇
The kind of substance is just like form but is full of holes to trap the gold, as a result of the force of gravity the gold is stuck inside the mat.
look at the image below 👇👇
RE: Articlc 2-Alluvial Gold Mining