Large Fixed Gold Washing Equipment For Placer Gold Mining

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Placer gold mining methods mineral processing 2019-10-14 the lower end of the trough is cut off at an angle of about 45 and closed by a screen of sheet-iron, b, in which a number of half-inch holes are punched, so that the fine dirt is allowed to pass through while the stones are retainedlow the screen is the upper end of the riffle-box, c, which is usually about 9 feet long, 3 feet.

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