This excerp was taken from http://www.minelinks.com/alluvial/dry_washer.html
This is just a small portion of the information you can get at the link site above. But in the interest of time for those of you who understand the drywasher and what you want to build, here are the important numbers to remember!
"In contrast to the single-weave canvas, silk or rayon permits a good extraction of gold, but too much dust goes through into the bellows. Heavier canvas is too tight for good separation. Copper-wire fly screen is used under the canvas. The riffle box is 11 inches wide and 40 inches long and contains six riffles. The slope of the riffle box is 5-1/2 inches to the foot. (Hand-operated machines are usually much smaller and the riffle box is set at a steeper angle than with powered machines.) The gravel and sand are shovelled onto a screen with 3/8-inch openings at the top of the washer. The bellows is operated at 250 pulsations per minute; the stroke is 3 inches. The capacity of the machine is about 4/5 yard per hour, which probably would correspond to 1-1/2 or 2 cubic yards, bank measure. (The plus 1-inch material was previously discarded.)" ----
The gentleman who provided this info about Small Mining comes from South Africa and his company is involved in gold and diamond exploration.
This is just a small portion of the information you can get at the link site above. But in the interest of time for those of you who understand the drywasher and what you want to build, here are the important numbers to remember!
"In contrast to the single-weave canvas, silk or rayon permits a good extraction of gold, but too much dust goes through into the bellows. Heavier canvas is too tight for good separation. Copper-wire fly screen is used under the canvas. The riffle box is 11 inches wide and 40 inches long and contains six riffles. The slope of the riffle box is 5-1/2 inches to the foot. (Hand-operated machines are usually much smaller and the riffle box is set at a steeper angle than with powered machines.) The gravel and sand are shovelled onto a screen with 3/8-inch openings at the top of the washer. The bellows is operated at 250 pulsations per minute; the stroke is 3 inches. The capacity of the machine is about 4/5 yard per hour, which probably would correspond to 1-1/2 or 2 cubic yards, bank measure. (The plus 1-inch material was previously discarded.)" ----
The gentleman who provided this info about Small Mining comes from South Africa and his company is involved in gold and diamond exploration.
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