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bowing &. they advertised it on their website as 5 tons per hour (almost 180 five gallon buckets we'll post our findings. More …reverse helix gold concentrator - Ons Vertier. Reverse Helix Gold Trommel . Reverse Helix Gold Trommel Another concentrator device based on the spiral design is the helix gold trommel. A helix is a cylinder lined with spirals along the inside. Helixes are suitable for use as roughers or cleaners,
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