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thoughts on expanded metal

what are the thoughts on usage under the riffles? I know on my highbanker it allows light to come thru and I am wondering if losing fines this way. is this a way to keep the riffles from loading up too much. I find some very fine gold still with it i

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gold that is black ?

so i live in Ramona California and there is a rumor that the river witch starts in my property in the foothill of a large mountain range has gold in it and that a local rancher made a living in the early 50's buy working this same river .so i asked s

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