riffle

Simple as adding a flange to the riffle side to connect the 2 halves. I am going to add a screen (12" x 10") and upper deck over the riffle area using more fiberglass 42" x 10". The screen is going to be a 1/8-1/4" wire freezer rack /1/2" to 3/4" spacing. A wire screen. The spacing between the riffle deck and discard plate above it is not set yet.

Gold Sluice Box Design

 — Mercury may be added to riffles to facilitate fine gold recovery, but its escape into the environment must be prevented. ... On one dredge, gold recovery was 90% for 12-hour gold cleanups and …

What is Gold dredge and it's future

 — What is gold dredge? A gold dredge usually refers to a placer mining machine that extracts gold from sand, gravel, and dirt using water and mechanical methods. The original gold dredges were large, multi-story machines built in the first half of the 1900s. Small suction machines are currently marketed as "gold dredges" for individuals seeking …

Gold Suction Dredge | Gold Mining Bucket Dredge

 — But his riffles would trap black sand and blind the riffles, and the fine gold was washing right over the black sand-clogged riffles and back into the river. When R.E. asked the man why he was not catching the fine gold as well, the man told him he'd be a very rich man if he could. Revolutionizing Gold Dredging Equipment

Clarkston riffle design questions PICS!!

 — The recommended spacing between riffles is twice the height. Measure from the top of the leading edge of the riffle down to the sluice and double that measurement as the spacing between riffles. That 2:1 ratio is the formula for creating the proper vortex between riffles. (provided the angle of the sluice and the flow are adjusted accordingly)

Riffle Design, Height & Spacings?? | TreasureNet The …

 — At the end of the day I feel the 3.25" spacing with a slow water speed is better for finer gold recovery as there is more flat area between the riffles for the fine gold to get into the carpet & not agitated out.

Sluicing

I'm not going to go into riffle design here, but know that the riffle is the key. Some riffle's like fast water and some like slow. Makes no difference here. To set up the box you have to move all the large stuff off and then get rid of most of the heavier sands. A box is running right when you fill the front with gravel (and hopefully some gold).

The ? world leader in innovative gold mining and â› ï¸ prospecting equipment! Family-owned since 1955! Order Toll Free: 800-392-4653. Order Toll Free: 800-392-4653. HOME; ... There is so much more to reclamation dredging than just hunting for gold! Recent flooding has created a demand for cleaning out waterways, clearing out ponds, and ...

The Gold Dredge

At the end of the flared tube a riffle tray is attached containing a series of gold traps. As the gold bearing gravel is sucked into the dredge the heavier particles, including gold, becomes entrapped into the riffle tray. The lighter non gold bearing particles flow back into the river.

Alaska Gold Dredge | My Alaskan Life

The riffles or gold traps in the sluice box are best described as "Hungarian Riffles". This type of riffle has proven to be the most efficient gold recovery system. ... Before starting the engine of the gold dredge, the pump must be fully primed (filled with water). All jetting pumps provided with our dredges have a mechanical water pump ...

Flared sluice?

 — A flared sluice used in a dredge configuration must still maintain a minimum water velocity and depth to clear large material. Advantage - Velocities are changing …

How To Set The Right Sluice Box Angle (Tips & Tricks)

Even if the density of the gold is just as high, every bit will be tinier and lighter. This makes the gold much more prone to getting grabbed by the water flow and later discharged out of the sluice. With that said, most gold found is fine gold. Only around 2% of the gold mined today is estimated to be gold nuggets, according to some figures.

» Setting Up the Proper Recovery System

Over the many years, my various partners and I have experimented a lot with secondary recovery systems to catch fine gold and gemstones that get sucked up the suction nozzle of a floating dredge.There are numerous …

Riffle size? | TreasureNet The Original Treasure Hunting …

 — Kurt for the size of the gold your getting in Nebraska a small riffel will work fine for you! but youll need to controll the water and your feed and keep anything from slipping underneath your riffels. if .like Hoser said, if you can see ANY light underneath the riffel, youll be losing your fine gold for sure!.on my dredge,i weld the expanded ...

GOLD MINER'S TOOLS :: Dredges by …

This unique dredge features our SB6SE, 6" extended sluice box that is equipped with a specialized 20' x 26" Diamond Riffle, a system specifically designed for the recovery of diamonds and gemstones. The 6220DE has an amazing a dredging capacity of up to 15 yards per hour and a depth of up to 50 feet.

The Riffle/Trap System

 — The design and style of the riffle system is very important, for if the riffles are spaced to close or to far away from each other this can and will effect the performance …

4 Dredge Instructions

non bearing values and larger aggregate are returned back into the water .The riffles, or gold traps in the sluice box are best described as "Hungarian Riffles". This type of riffle has proven to be the most efficient gold recovery system. As material flows over the riffles, a vortex, or eddy current is formed between each riffle opening.

The Size of Riffles

Most recovery systems on suction dredges use fixed riffles to trap gold out of lighter streambed materials as they are washed through a sluice box by a flow of water. Riffles are baffle-like obstructions, fixed in place along the …

Build Your Own DIY Gold Mining Gear

 — Building your own homemade gold dredge is not as challenging as it may seem. With the right materials and a little bit of know-how, you can create a high-performing dredge that rivals store-bought options. ... Attach the riffle assemblies to the base of the sluice box, making sure to create proper spacing between the riffles for optimal gold ...

Very fine gold recovery? | Gold Dredging Forum

 — I am in the process of making some fine gold recovery alterations to my dredge sluice... classifying, riffle sizes, waters speed and volume etc... I have plenty of ideas and information, but I was wondering if any one had any "out there left field" ideas they have tried with success? ... There where some threads about installing hydraulic ...

Gold dredge

Gold then settles to the bottom of the pan, or into the bottom of the riffles of the sluice box. The gold dredge is the same concept but on a much larger scale. Professional gold miner using an advanced dredge system. Sumatra. Indonesia. May 2015. Gold dredges are an important tool of gold miners around the world.

Proline Mining Equipment/Gold Dredges 4" inch

The rear portion of the sluice box utilizes "Hungarian" riffles for maximum efficiency and the dredge is equipped with Nomad matting for the ultimate in fine gold recovery. No other 4" dredge even comes close. 4" Dredge w/Honda GX160 & HP350 pump . 4" Dredge w/Honda GX160 & HP350 pump & T-80 . 4" Dredge w/Honda GX200 & HP400 pump & T-80 . 4 ...

Has anybody made their own dredge?

 — Ive run a dredge and shut down after 30-45 minutes and my riffles were full of black sands and gold, and ran all day long 4-8 hours and clean up was the same, no more fine gold than short runs in the same material.....makes me wonder how much ive lost over time..... you can build a dredge on legs, or floation, and the floatation can be inner ...

Which Riffles Work Best in the Sluice Box?

 — The trouble is that I have an abundance of flour gold and an overwhelming amount of pea gravel and larger magnetite that plugs up nearly all riffles. The other area this dredge operates in has even finer gold and the most fine black sands I have ever seen. Keep in mind this is a 5" dredge with a massive amount of water flowing through the box.

Gold Hog "RiverHog" mat

The drip chambers and the PRE-RAMP grooves often catch gold before it hits the main riffle section. We recommend that this mat be used in combination with the Scrubber and Razorback or even UR mat in most dredges. ... Each person will have to vary the install based on their own equipment, spacing and ability to modify if needed. However, once ...

Gold Hog "UR" mat

UR and Little Hog mat is the same name for a great Under Riffle / Expanded mesh matting from the GOLD HOG company. ... Each person will have to vary the install based on their own equipment, spacing and ability to modify if needed. However, once done, most find the effective gold recovery rate increases greatly. ... a division of DUNSTAN CREEK ...

Metallurgist & Mineral Processing Engineer

Metallurgist & Mineral Processing Engineer

How To Suction Dredge for Gold: The Basics

 — Nuggets and particles sink down into the riffles, while non-gold materials like excess sand and dirt get washed away. Pro Tip: As with all the other components of your dredge, the sluice box needs adequate water in order to function properly. ... Most gold dredges use gasoline to power the engines, which in turn powers the water pumps. The ...

How To Suction Dredge for Gold: The Basics

 — The sluice box is where the magic happens, so to speak. Inside the box is a series of textured riffles designed to catch particles of gold. Nuggets and particles sink down into the riffles, while non-gold …

The Riffle/Trap System

 — The design and style of the riffle system is very important, for if the riffles are spaced to close or to far away from each other this can and will effect the performance of the riffles to capture gold. Also the size and shape of the riffles are just as important as the spacing is. I have never bought a sluice box, all of my boxes are homemade ...

Keene's New Fine Gold Riffle kit for 4" mini dredge.

 — I made something like that for my 4" 3 stage dredge. It catches a lot of fine material in the first few inches after the undercurrent is where it drops. Maybe 1 -2 pieces of -30 gold everything else is -50. Catches less fine gold than first stage and undercurrent though. I might replace the last few inches of screen/expanded with a couple riffles.

Riffle size? | TreasureNet The Original Treasure Hunting …

 — Create the proper vortices to allow the different sizes of gold to separate and drop out of the water flow to then become trapped for recovery. Here is the main design …

Effect of Riffle Height and Spacing of a Sluice Board on Placer Gold …

 — Analysis of concentrates showed that, 85.4% of gold was recovered during sluicing at approximately 1.0 cm riffle height. The lowest recovery was recorded at 0.5 cm riffle height. Gold recovery was also affected by riffles spacing. For the indicated speeds and the riffle heights the necessary spacing should not be more than 20 cm.

How Does a 4-Inch Suction Gold Dredge Work?

 — Want to use a 4-inch suction dredge for your gold prospecting hobby? Learn more about how the dredge works to suck up gravel and sift out gold. ... Stage one, or primary recovery, traps larger gold pieces in the riffles. These gold pieces are easy to see and pluck out. Stage two, or secondary recovery, grabs smaller, coarser pieces of gold …