design and build of sluice and riffle

Lay down the ribbed mat as you first layer in the sluice. Extend it to the bottom tip of the flare but leave ¼ of the bottom part of the sluice empty. Lay down the second layer, which is the miner's moss. This should be slightly shorter than the ribbed mat and placed at the center of the ribbed mat.

The principles in sluice design are best visualized as material bodies obstructing the flow of slurry. Depending on the shape and size of the obstruction (riffle design) and the water velocity (solids content & slope) a turbulent flow is established, with eddies forming around … See more

Step 2: Level the sluice box and stabilize. Make sure that the sluice box is leveled sidewise. You want the flow of water to be even across the riffles and mattings to ensure optimum performance. Lengthwise, the sluice box should be angled around 5-7 degrees to allow pebbles and other materials to pass through easily.

Thin plates of metal situated at a 45 degree angles and held by rails that fit just inside the box are ideal. These riffles are then held in place with a few bolts. At the end of the day, unscrew the bolts and lift out the riffles to clean out the box. During the early gold rush days, sluice boxes were generally constructed with slats of wood ...

An easily built and effective rifle suitable for use in a small sampling sluice can be made from ½" x ½" wood strips placed across the bottom of the sluice at right angles to the flow, with ¾" spaces between each riffle bar. The boiling action can be improved by undercutting the downstream face of each bar on a 30-degree bevel.

The History of Hydraulic Riffles. In-depth research on gold recovery in the Yukon conducted in 1990 by Randy Clarkson concluded that the "reliability, …

Slope of a sluice is generally in the range of 1.3 cm (1/2 in.) to 3.8 cm (1-1/2 in.) per 30.5 cm (1 ft), depending on the size rock in the feed. To move the larger rocks down the sluice requires a steeper slope or more water, both of which cause greater gold losses. Any number of types of collectors can.

The principles in sluice design are best visualized as material bodies obstructing the flow of slurry. Depending on the shape and size of the obstruction (riffle design) and the water velocity (solids content & slope) a turbulent flow is established, with eddies forming around the obstruction. Such eddies create

Here is a discussion of the function of these two parts, to better help you design you own home made highbanker sluice: The sluice box part of a highbanker is really is not that different from a regular sluice. The riffles may be a bit taller, but the riffles and carpet or miners moss underneath the riffles is virtually the same.

The rubber riffle design works fantastic in both fast and slow water conditions. We have tested this riffle design for. Order Toll Free: 800-392-4653. Order Toll Free: 800-392-4653. ... Easy clean up, slide …

Drop Riffle is a term that describes the Drop Pockets in the bottom of our boxes. Whereas most Metal Sluice Boxes with metal angled ribs that cause the material your running, including your gold small or large. Remember Gravity Pulls Down. These boxes have a constant flow of water right above the top of those angles.

You just want to avoid major disturbances around the outside they are going to make (4:35 unclear) in here. Because those will mess up the way the gold is sorted as well. So you don't want to bury your sluice, you don't want to have the water all the way up to here, either on the top end or the bottom end. You want to have about an inch on ...

Pros. The sluice box is made from strong .080 gauge 5052 aircraft aluminum, which is lightweight and durable. The unique elongated 45 degree z-riffles are great for trapping gold. The hopper dredge box has a spray bar with built-in adjustable water flow and pressure port controls. Cons.

Otherwise, the material will build up on the dredge and sink it in very short order! So initially, we are dealing with a water-force through the sluice box that will wash 4.5-inck rocks all the way through. ... are directed into low …

Of gold sluice select is an effectual alternatives for panning for golf, enable aforementioned mining to quickly view through a much greater volume of sediment. Although many affordable varieties are available the buying, they are even more affordable go build. With a little knowledge, skill, and creativity, an prospector can build a custom sluice box free ...

The gold sluice box is an highly alternative to panning required gold, allowing the prospector to quickly sift through a considerably biggest volume of sediment. Although much affordable varieties are open till purchase, they are even more affordable to builds. Are a little knowledge, skill, and creativity, a prospector can build a custom sluice box from …

Sluicing is the preferred mineral processing technique for the treatment of placer gold-bearing alluvium for small scale and artisanal miners in Ghana because sluice board is perceived to be the most cost effective device. However, there are differences in approaches from design to operation. In this work, about 50 kg of ore was obtained from …

The nozzle-restriction will allow a 4.5-inch rock to be sucked up into the sluice box. And there must be enough water-flow through the sluice to …

The Hungarian riffles aid in the breaking up process. A drawing of a three-box sluice appears on a following page. This design is patterned after the 'Yukon zig-zag' and …

2) Plan and Design your Sluice Box . A sluice box is simply a long narrow box fitted with a number of obstructions referred to as riffles. When placed in a stream of running water the gold bearing dirt …

Step 1: Planning the Sluice Box. So what is a sluice box and how does it work? Basically, a sluice box is a long, narrow box with a series of obstructions called riffles in it.

With the riffles closer together you get the water bouncing back off the next riffle down to really create that churning, vibrating, sorting action betwwen the riffles. Not so much when the riffles are spaced firther apart With a stream sluice & classification you can have a gentler flow of water & you are more in control of what is happening.

My recommended design for a rocker is to start buy building a sluice box 40 inches long, 16 inches wide on the bottom, sloped like a cradle, and with rockers at each end. The hopper would be 16 inches square and 6 inches deep, with a sheet metal bottom made of perforated steel with 1/2-inch holes.

The Hungarian riffles aid in the breaking up process. A drawing of a three-box sluice appears on a following page. This design is patterned after the 'Yukon zig-zag' and permits many feet of sluice box to be stacked up in only four feet of length. By adding the wheels and wheelbarrow-type handles, the whole rig is easily moved from place to place.

A sluice box contains several traps across the length of its channel that are designed to disrupt the flow of water in various ways. This is primarily done to slow down the flow so …

The suspension heights of the gold particles of the various operational regimes of the sluice board at superficial velocities of 0.5 m/s, 1.0 m/s, 1.5 m/s and 2.0 m/ were 0.9 cm, 1.2 cm, 1.5 cm and 2.9 cm respectively. Analysis of concentrates showed that, 85.4% of gold was recovered during sluicing at approximately 1.0 cm riffle height.

VERSATILE: These sluice box modules may be used individually, fitted together side-by-side when needed to fit a wider stream to catch your nugget placer gold, or used together end-to-end for a whopping 53" long stream sluice with flare. Alternating V-trap riffles and miners moss pockets are designed to catch both flake and flour gold fines.

The riffles on the first (front) set are 3/4 inch high, the riffles on the upper deck of the under current are 1 and 1/4 inches, and the lower under current riffles are 3/8 ths of an inch high. I used standard mild 1/16 th inch steel for all the riffles. The sluice box itself is just a big sheet of aluminum bent into a trough, and was no big deal.

I used scrap lumber from circle our workshop. ME used a 1 x 6 lodge 36 inches long for the base and 1 x 3's for the sides. The only things I bought for it were 1/4 by 1/4 square dowels to use as riffles. I glued the riffles toward it spaced 1 1/2 inches apart. It make only an afternoon to build, and most of that was just waiting on the glue to dry.

How do riffles work. The reason that riffles work is two fold. First, there is an eddy created behind each riffle, causing a temporary lull in the water flow. The material that is flowing is in a liquid state. This causes the …

Building an ultralight backpackable highbanker is a challenging process that is fun and rewarding. ... the sluice box matting I was operating had a drop riffle design that was really nice. I enjoyed it. And I thought it worked really well. It was also very expensive, by the way, and I basically built my highbanker to fit that exact drop riffle ...

Raised wooden bar above the inspection mat for a sluice magnet. (haven't got the magnet yet though) Riffles are closer together at 2 inches and aluminum Hungarian riffles to help keep the material moving and not build up like my last sluice does. The first riffle is facing the opposite way to help speed up velocity.

Reduce the walls of the riffles. They should be 0.85″ long. 7. ... Homemade Gold Sluice Box Design and Building Guide. After a very seconds the run time (it's that fast) I was able to pan which black sand back down that MYSELF ran through the boiler box. MYSELF found one flake of gold that was lower 60 engage in the pan.

The design has 3 pipes across the fluid bed. Each pipe has two rows of holes. The outside diameter of the tubues is 3/4" The hidraulic riffles need 5 GPM of water and 3-6 psi. The sluice will run about 2 cu/yds/hr of gravel mixed with 100 GPM of water over the fluid bed.

Clarkson, R. and Peer, O., 1990. An Analysis of Sluicebox Riffle Performance. Klondike Placer Miners Association, 31 p.. Abstract: The sluicebox is still the most popular placer gold recovery device in the Yukon because of its simplicity, reliability, low cost and very high concentration ratio. A sluicebox is a rectangular flume containing riffles on matting, …

Classify your material using a classifier or screen to remove larger rocks and debris. Shovel material into the top of the sluice box, making sure not to overload it. Adjust the water flow so that it is not too fast or too slow. Watch as the gold-bearing material is washed down the sluice box and captured in the riffles.

Water should enter the wide end of the sluice. It is frequently made of metal, but might also be of wood or plastic. It is the wide end and quickly tapers to the width of your riffled material. Weighting down your sluice may be necessary. The sluice will be carried downstream without added weight if the stream current is strong.

Each riffle creates an eddy, a backflow of water that allows the gold to settle out. Material is placed at the top of the box and carried in suspension down the channel. The gold drops out of suspension as the water slows on the back side of the riffles. Sluice Box Set-Up & Use. Getting the flow right is the key to running a sluice.

Water injection into the capture zone of a sluice-box, marketed as hydraulic riffles, represents the latest major development. After L.G. Heron filed a patent in 1987 for the technology it remained poorly understood or implemented by 1990 when Clarkson commented on early North American adopters that the technology requires "more testing ...

It's more of a "visual energy" sort of thing. OUR SOLUTION: Make a stream sluice PACKAGE that has both regular flow and low flow mats. Regardless of the flow you have the right matting. Back Flow or Back Pressure at the End. When you set up a stream sluice most of the time the END of the sluice will be under water.