The Long Tom is a sluice variant and as you would expect the LONG TOM and the dip box are included here because of their simplicity and potential usefulness. The long tom is a small sluice that uses less water than a regular sluice. It consists of a sloping trough 12 feet long, 15 to 20 inches wide at the upper end, flaring to 24 to 30 inches at the lower end. The lower end of the box is set at a 45 degree angle and is covered with a perforated plate or screening with one-quarter- to three-quarter-inch openings. The slope varies from 1 to 1-2/2 inches per foot. Below this screen is a second box containing riffles; it is wider and usually shorter and set at a shallower slope than the first box (Figure 6).