This next site is a fine Canadian site. It is a prospecting forum. It includes a number of plans for various equipment including :fine recovery sluice, rocker box (a model I have already included above), high banker, rock saw, trommel, gold catcher, leaf blower powered dry washer, and a leaf blower vacuum for sucking out that crevice material so often containing gold.
http://www.gpex.ca/homemade-gold-prospecting-tools.html
http://www.gpex.ca/homemade-gold-prospecting-tools.html
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